LTC2862IS8-2#PBF [Linear]
LTC2862 - ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;型号: | LTC2862IS8-2#PBF |
厂家: | Linear |
描述: | LTC2862 - ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 驱动 光电二极管 接口集成电路 驱动器 |
文件: | 总26页 (文件大小:397K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC2862/LTC2863/
LTC2864/LTC2865
±±6VFault Protected 3Vto 5.5V
RS485/RS422 Transceivers
FeaTures
DescripTion
n
Protected from Overvoltage Line Faults to ±±6V
TheLTC®2862/LTC2863/LTC2864/LTC2865arelowpower,
20Mbpsor250kbpsRS485/RS422transceiversoperating
on 3V to 5.5V supplies that feature 60V overvoltage fault
protectiononthedatatransmissionlinesduringallmodes
of operation, including power-down. Low EMI slew rate
limited data transmission is available in a logic-selectable
250kbpsmodeintheLTC2865andin250kbpsversionsof
the LTC2862-LTC2864. Enhanced ESD protection allows
these parts to withstand 15kV HBM on the transceiver
interface pins without latchup or damage.
n
3V to 5.5V Supply Voltage
n
26Mbps or Low EMI 256kbps Data Rate
n
±ꢀ5kV ESD Interface Pinsꢁ ±8kV ꢂll Other Pins
n
Extended Common Mode Range: ±25V
n
Guaranteed Failsafe Receiver Operation
n
High Input Impedance Supports 256 Nodes
n
1.65V to 5.5V Logic Supply Pin (V ) for Flexible
L
Digital Interface (LTC2865)
n
n
MP-Grade Option Available (–55°C to 125°C)
Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
Extended 25V input common mode range and full fail-
safe operation improve data communication reliability in
electrically noisy environments and in the presence of
large ground loop voltages.
n
n
n
Current Limited Drivers and Thermal Shutdown
Pin Compatible with LT1785 and LT1791
Available in DFN and Leaded Packages
proDucT selecTion GuiDe
applicaTions
PꢂRT
MꢂX DꢂTꢂ
RꢂTE (bps)
NUMBER
DUPLEX
HALF
HALF
FULL
FULL
FULL
FULL
FULL
ENꢂBLES
YES
V PIN
L
n
Supervisory Control and Data Acquisition (SCADA)
LTC2862-1
LTC2862-2
LTC2863-1
LTC2863-2
LTC2864-1
LTC2864-2
LTC2865
20M
250k
NO
NO
NO
NO
NO
NO
YES
n
Industrial Control and Instrumentation Networks
YES
n
Automotive and Transportation Electronics
NO
20M
n
Building Automation, Security Systems and HVAC
Medical Equipment
Lighting and Sound System Control
NO
250k
n
YES
20M
n
YES
250k
L, LT, LTC, LTM, Linear Technology the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
YES
20M/250k
LTC28±5 Receiving ꢀ6Mbps ±266mV Differential
Signal with ꢀMHz ±25V Common Mode Sweep
Typical applicaTion
RS485 Link With Large Ground Loop Voltage
A,B
LTC2862
LTC2862
A,B
50V/DIV
VCC1
VCC2
RO1
RE1
DE1
R
R
RO2
RE2
DE2
A-B
A-B
0.5V/DIV
R
t
R
t
DI1
D
D
DI2
RO
RO
V GROUND LOOP
≤25V PEAK
5V/DIV
2862345 TA01a
GND1
GND2
2862345 TA01b
100ns/DIV
2862345fc
1
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
absoluTe MaxiMuM raTinGs
(Note ꢀ)
Supply Voltages
Receiver Output (RO)
V ............................................................. –0.3 to 6V
(LTC2865) ..................................–0.3V to (V + 0.3V)
CC
L
V .............................................................. –0.3 to 6V
L
Operating Ambient Temperature Range (Note 4)
Logic Input Voltages (RE, DE, DI, SLO).......... –0.3 to 6V
Interface I/O: A, B, Y, Z..............................–60V to +60V
Receiver Output (RO)
LTC286xC ................................................ 0°C to 70°C
LTC286xI .............................................–40°C to 85°C
LTC286xH.......................................... –40°C to 125°C
LTC286xMP ....................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
(LTC2862-LTC2864) ...................–0.3V to (V +0.3V)
CC
pin conFiGuraTion
LTC2862-1, LTC2862-2
LTC2862-1, LTC2862-2
TOP VIEW
TOP VIEW
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
CC
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
B
A
CC
9
GND
GND
S8 PACKAGE
8-LEAD (150mil) PLASTIC SO
DD PACKAGE
T
= 150°C, θ = 150°C/W, θ = 39°C/W
JMAX
JA
JC
8-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) CONNECT TO PCB GND
T
= 150°C, θ = 43°C/W, θ = 3°C/W
JMAX
JA
JC
LTC2863-1, LTC2863-2
LTC2863-1, LTC2863-2
TOP VIEW
TOP VIEW
V
1
2
3
4
8
A
B
Z
Y
CC
V
1
2
3
4
8
7
6
5
A
B
Z
Y
CC
RO
DI
7
6
5
RO
DI
9
GND
GND
S8 PACKAGE
8-LEAD (150mil) PLASTIC SO
DD PACKAGE
T
= 150°C, θ = 150°C/W, θ = 39°C/W
JMAX
JA
JC
8-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) CONNECT TO PCB GND
T
= 150°C, θ = 43°C/W, θ = 3°C/W
JMAX
JA
JC
LTC2864-1, LTC2864-2
LTC2864-1, LTC2864-2
TOP VIEW
TOP VIEW
NC
1
2
3
4
5
6
7
14
V
CC
RO
1
2
3
4
5
10
V
A
B
Z
Y
CC
RO
RE
13
12
11
10
9
NC
A
RE
DE
9
8
7
6
11
DI
DE
B
GND
DI
Z
GND
GND
Y
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
8
NC
EXPOSED PAD (PIN 11) CONNECT TO PCB GND
T
= 150°C, θ = 43°C/W, θ = 3°C/W
JMAX
JA JC
S PACKAGE
14-LEAD (150mil) PLASTIC SO
T
= 150°C, θ = 88°C/W, θ = 37°C/W
JMAX
JA JC
2862345fc
2
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
pin conFiGuraTion
LTC2865
LTC2865
TOP VIEW
TOP VIEW
1
2
3
4
5
6
RO
RE
DE
DI
12
11
10
9
8
7
V
A
B
Z
Y
CC
RO
RE
DE
DI
1
2
3
4
5
6
12
11
10
9
V
A
B
Z
Y
CC
13
V
13
L
GND
SLO
V
8
L
MSE PACKAGE
12-LEAD PLASTIC MSOP
EXPOSED PAD (PIN 13) CONNECT TO PCB GND
= 150°C, θ = 40°C/W, θ = 10°C/W
GND
7
SLO
T
JMAX
JA
JC
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 13) CONNECT TO PCB GND
T
= 150°C, θ = 43°C/W, θ = 4.3°C/W
JMAX
JA JC
orDer inForMaTion
LEꢂD FREE FINISH
LTC2862CS8-1#PBF
LTC2862IS8-1#PBF
LTC2862HS8-1#PBF
LTC2862CS8-2#PBF
LTC2862IS8-2#PBF
LTC2862HS8-2#PBF
LTC2862CDD-1#PBF
LTC2862IDD-1#PBF
LTC2862HDD-1#PBF
LTC2862CDD-2#PBF
LTC2862IDD-2#PBF
LTC2862HDD-2#PBF
LTC2863CS8-1#PBF
LTC2863IS8-1#PBF
LTC2863HS8-1#PBF
LTC2863CS8-2#PBF
LTC2863IS8-2#PBF
LTC2863HS8-2#PBF
LTC2863CDD-1#PBF
LTC2863IDD-1#PBF
LTC2863HDD-1#PBF
LTC2863CDD-2#PBF
LTC2863IDD-2#PBF
LTC2863HDD-2#PBF
TꢂPE ꢂND REEL
PꢂRT MꢂRKING*
28621
28621
28621
28622
28622
28622
LFXK
PꢂCKꢂGE DESCRIPTION
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
TEMPERꢂTURE RꢂNGE
0°C to 70°C
LTC2862CS8-1#TRPBF
LTC2862IS8-1#TRPBF
LTC2862HS8-1#TRPBF
LTC2862CS8-2#TRPBF
LTC2862IS8-2#TRPBF
LTC2862HS8-2#TRPBF
LTC2862CDD-1#TRPBF
LTC2862IDD-1#TRPBF
LTC2862HDD-1#TRPBF
LTC2862CDD-2#TRPBF
LTC2862IDD-2#TRPBF
LTC2862HDD-2#TRPBF
LTC2863CS8-1#TRPBF
LTC2863IS8-1#TRPBF
LTC2863HS8-1#TRPBF
LTC2863CS8-2#TRPBF
LTC2863IS8-2#TRPBF
LTC2863HS8-2#TRPBF
LTC2863CDD-1#TRPBF
LTC2863IDD-1#TRPBF
LTC2863HDD-1#TRPBF
LTC2863CDD-2#TRPBF
LTC2863IDD-2#TRPBF
LTC2863HDD-2#TRPBF
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (150mil) Plastic SO
LFXK
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LFXK
LFXM
LFXM
LFXM
28631
28631
28631
28632
28632
28632
LFXN
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
8-Lead (150mil) Plastic SO
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
8-Lead (150mil) Plastic SO
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
8-Lead (150mil) Plastic SO
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
LFXN
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LFXN
LFXP
LFXP
–40°C to 85°C
–40°C to 125°C
LFXP
2862345fc
3
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
orDer inForMaTion
LEꢂD FREE FINISH
LTC2864CS-1#PBF
LTC2864IS-1#PBF
LTC2864HS-1#PBF
LTC2864CS-2#PBF
LTC2864IS-2#PBF
LTC2864HS-2#PBF
LTC2864CDD-1#PBF
LTC2864IDD-1#PBF
LTC2864HDD-1#PBF
LTC2864CDD-2#PBF
LTC2864IDD-2#PBF
LTC2864HDD-2#PBF
LTC2865CMSE#PBF
LTC2865IMSE#PBF
LTC2865HMSE#PBF
LTC2865CDE#PBF
LTC2865IDE#PBF
TꢂPE ꢂND REEL
PꢂRT MꢂRKING*
LTC2864S-1
LTC2864S-1
LTC2864S-1
LTC2864S-2
LTC2864S-2
LTC2864S-2
LFXQ
PꢂCKꢂGE DESCRIPTION
TEMPERꢂTURE RꢂNGE
0°C to 70°C
LTC2864CS-1#TRPBF
LTC2864IS-1#TRPBF
LTC2864HS-1#TRPBF
LTC2864CS-2#TRPBF
LTC2864IS-2#TRPBF
LTC2864HS-2#TRPBF
LTC2864CDD-1#TRPBF
LTC2864IDD-1#TRPBF
LTC2864HDD-1#TRPBF
LTC2864CDD-2#TRPBF
LTC2864IDD-2#TRPBF
LTC2864HDD-2#TRPBF
LTC2865CMSE#TRPBF
LTC2865IMSE#TRPBF
LTC2865HMSE#TRPBF
LTC2865CDE#TRPBF
LTC2865IDE#TRPBF
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
14-Lead (150mil) Plastic SO
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
12-Lead Plastic MSOP
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LFXQ
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LFXQ
LFXR
LFXR
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LFXR
2865
2865
12-Lead Plastic MSOP
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
2865
12-Lead Plastic MSOP
2865
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
8-Lead (150mm) Plastic SO
14-Lead (150mm) Plastic SO
14-Lead (150mm) Plastic SO
2865
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
LTC2865HDE#PBF
LTC2862MPS8-1#PBF
LTC2862MPS8-2#PBF
LTC2863MPS8-1#PBF
LTC2863MPS8-2#PBF
LTC2864MPS-1#PBF
LTC2864MPS-2#PBF
LTC2865HDE#TRPBF
LTC2862MPS8-1#TRPBF
LTC2862MPS8-2#TRPBF
LTC2863MPS8-1#TRPBF
LTC2863MPS8-2#TRPBF
LTC2864MPS-1#TRPBF
LTC2864MPS-2#TRPBF
2865
28621
28622
28631
28632
LTC2864S-1
LTC2864S-2
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature rangeꢁ otherwise specifications are at Tꢂ = 25°C. VCC = VL = 3.3V unless otherwise noted. (Note 2)
SYMBOL
Supplies
PꢂRꢂMETER
CONDITIONS
MIN
TYP
MꢂX
UNITS
l
l
l
V
V
Primary Power Supply
3
5.5
V
V
CC
L
Logic Interface Power Supply
LTC2865 Only
1.65
V
CC
I
Supply Current in Shutdown Mode
(C-, I-Grade) (N/A LTC2863)
DE = 0V, RE = V = V
0
0
5
µA
CCS
CC
L
L
l
l
Supply Current in Shutdown Mode
(H-, MP-Grade) (N/A LTC2863)
DE = 0V, RE = V = V
40
µA
µA
CC
I
Supply Current with Both Driver and
Receiver Enabled (LTC2862-1, LTC2863-1,
LTC2864-1, LTC2865 with SLO High)
No Load, DE = V = V , RE = 0V
900
1300
CCTR
CC
L
2862345fc
4
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature rangeꢁ otherwise specifications are at Tꢂ = 25°C. VCC = VL = 3.3V unless otherwise noted. (Note 2)
SYMBOL
PꢂRꢂMETER
CONDITIONS
No Load, DE = V = V , RE = 0V
MIN
TYP
MꢂX
UNITS
l
I
Supply Current with Both Driver and
Receiver Enabled (LTC2862-2, LTC2863-2,
LTC2864-2, LTC2865 with SLO Low)
3.3
8
mA
CCTRS
CC
L
Driver
l
l
l
l
|V
|
Differential Driver Output Voltage
R = ∞ (Figure 1)
1.5
1.5
2
V
V
V
V
V
OD
CC
R = 27Ω (Figure 1)
R = 50Ω (Figure 1)
5
V
CC
Δ|V
|
Change in Magnitude of Driver Differential R = 27Ω or 50Ω (Figure 1)
Output Voltage
0.2
OD
l
l
V
Driver Common-Mode Output Voltage
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
3
V
V
OC
Δ|V
|
Change in Magnitude of Driver
Common-Mode Output Voltage
0.2
OC
l
l
I
I
Maximum Driver Short-Circuit Current
–60V ≤ (Y or Z) ≤ 60V (Figure 2)
150
250
30
mA
µA
OSD
Driver Three-State (High Impedance)
Output Current on Y and Z
DE = 0V, V = 0V or 3.3V, V = –25V,
CC O
25V
OZD
Receiver
l
l
l
l
I
IN
Receiver Input Current (A,B)
V
CC
V
CC
V
CC
V
CC
= 0V or 3.3V, V = 12V (Figure 3)
125
143
µA
µA
µA
µA
IN
(C-, I-Grade LTC2863, LTC2864, LTC2865)
= 0V or 3.3V, V = –7V (Figure 3)
–100
–100
IN
Receiver Input Current (A,B)
(H-, MP-Grade LTC2863, LTC2864,
LTC2865; C-, I-, H-, MP-Grade LTC2862)
= 0V or 3.3V, V = 12V (Figure 3)
IN
= 0V or 3.3V, V = –7V (Figure 3)
IN
R
Receiver Input Resistance
0 ≤ V ≤ 5.5V, V = –25V or 25V
112
kΩ
V
IN
CC
IN
(Figure 3)
l
l
V
V
Receiver Common Mode Input Voltage
(A + B)/2
–25
25
CM
Differential Input Signal Threshold
Voltage (A – B)
–25V ≤ V ≤ 25V
200
mV
TH
CM
ΔV
Differential Input Signal Hysteresis
V
= 0V
150
–50
25
mV
mV
mV
V
TH
CM
l
Differential Input Failsafe Threshold Voltage –25V ≤ V ≤ 25V
–200
0
CM
Differential Input Failsafe Hysteresis
Receiver Output High Voltage
V
CM
= 0V
V
V
I(RO) = –3mA (Sourcing)
l
l
l
V
–0.4V
OH
CC
V ≥ 2.25V, I(RO) = –3mA (LTC2865)
V –0.4V
L
L
V < 2.25V, I(RO) = –2mA (LTC2865)
V –0.4V
L
L
l
l
Receiver Output Low Voltage
I(RO) = 3mA (Sinking)
0.4
5
V
OL
I
Receiver Three-State (High Impedance)
Output Current on RO
RE = High, RO = 0V or V
RO = 0V or V (LTC2865)
µA
OZR
CC
L
l
I
Receiver Short-Circuit Current
RE = Low, RO = 0V or V
20
mA
OSR
CC
RO = 0V or V (LTC2865)
L
Logic
(LTC28±2ꢁ LTC28±3ꢁ LTC28±4)
Input Threshold Voltage (DE, DI, RE)
Logic Input Current (DE, DI, RE)
(LTC28±5)
l
l
V
TH
3.0 ≤ V ≤ 5.5V
0.33 • V
0.67 • V
CC
V
CC
CC
I
INL
0 ≤ V ≤ V
CC
0
0
5
µA
IN
Logic
l
l
V
TH
Input Threshold Voltage (DE, DI, RE, SLO) 1.65V ≤ V ≤ 5.5V
0.33 • V
0.67 • V
L
V
L
L
I
INL
Logic Input Current (DE, DI, RE, SLO)
0 ≤ V ≤ V
L
5
µA
IN
2862345fc
5
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
swiTchinG characTerisTics The l denotes the specifications which apply over the full operating
temperature rangeꢁ otherwise specifications are at Tꢂ = 25°C. VCC = VL = 3.3V unless otherwise noted. (Note 2)
SYMBOL
PꢂRꢂMETER
CONDITIONS
MIN
TYP
MꢂX
UNITS
Driver – High Speed (LTC28±2-ꢀꢁ LTC28±3-ꢀꢁ LTC28±4-ꢀꢁ LTC28±5 with SLO High)
l
l
l
f
t
Maximum Data Rate
(Note 3)
20
Mbps
ns
MAX
, t
Driver Input to Output
R
DIFF
DIFF
= 54Ω, C = 100pF (Figure 4)
25
2
50
9
PLHD PHLD
L
Δt
Driver Input to Output Difference
R
= 54Ω, C = 100pF (Figure 4)
ns
PD
L
|t
– t
PHLD
|
PLHD
l
l
l
t
t
Driver Output Y to Output Z
Driver Rise or Fall Time
R
R
= 54Ω, C = 100pF (Figure 4)
10
15
ns
ns
ns
SKEWD
DIFF
L
, t
RD FD
= 54Ω, C = 100pF (Figure 4)
4
DIFF
L
t
t
, t
, t
,
Driver Enable or Disable Time
R = 500Ω, C = 50pF, RE = 0V
180
ZLD ZHD
LZD HZD
L
L
(Figure 5)
l
l
t
, t
Driver Enable from Shutdown
Time to Shutdown
R =500Ω, C = 50pF, RE = High
9
µs
ns
ZHSD ZLSD
L
L
(Figure 5)
t
R = 500Ω, C = 50pF, RE = High
180
SHDND
L
L
(Figure 5)
Driver – Slew Rate Limited ( LTC28±2-2ꢁ LTC28±3-2ꢁ LTC28±4-2ꢁ LTC28±5 with SLO Low)
l
l
l
f
Maximum Data Rate
(Note 3)
250
500
kbps
ns
MAX
t
, t
Driver Input to Output
R
= 54Ω, C = 100pF (Figure 4)
850
50
1500
500
PLHD PHLD
DIFF
DIFF
L
Δt
Driver Input to Output Difference
R
= 54Ω, C = 100pF (Figure 4)
ns
PD
L
|t
PLHD
– t
PHLD
|
l
l
l
t
t
t
Driver Output Y to Output Z
Driver Rise or Fall Time
Driver Enable Time
R
R
= 54Ω, C = 100pF (Figure 4)
500
1200
1200
ns
ns
ns
SKEWD
DIFF
L
, t
= 54Ω, C =100pF (Figure 4)
800
RD FD
DIFF
L
, t
R = 500Ω, C = 50pF, RE = 0V
ZLD ZHD
L
L
(Figure 5)
l
l
l
t
t
t
, t
Driver Disable Time
R = 500Ω, C = 50pF, RE = 0V
180
10
ns
µs
ns
LZD HZD
L
L
(Figure 5)
, t
Driver Enable from Shutdown
Time to Shutdown
R = 500Ω, C = 50pF, RE = High
ZHSD ZLSD
L
L
(Figure 5)
R =500Ω, C = 50pF, RE = High
180
SHDND
L
L
(Figure 5)
Receiver
l
t
t
t
, t
Receiver Input to Output
Differential Receiver Skew
C = 15pF, V = 1.5V, |V | = 1.5V,
50
2
65
9
ns
ns
PLHR PHLR
L
CM
AB
t and t < 4ns (Figure 6)
R
F
C = 15pF (Figure 6)
L
SKEWR
|t
– t
|
PLHR
PHLR
l
l
, t
Receiver Output Rise or Fall Time
Receiver Enable/Disable Time
C = 15pF (Figure 6)
L
3
12.5
40
ns
ns
RR FR
t
t
, t
, t
,
R = 1k, C = 15pF, DE = High (Figure 7)
L L
ZLR ZHR
LZR HZR
l
l
t
, t
Receiver Enable from Shutdown
Time to Shutdown
R = 1k, C = 15pF, DE = 0V, (Figure 7)
9
µs
ns
ZHSR ZLSR
SHDNR
L
L
t
R = 1k, C = 15pF, DE = 0V, (Figure 7)
100
L
L
Note ꢀ. Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2. All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3. Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150ºC when overtemperature protection is active.
Continuous operation above the specified maximum operating temperature
may result in device degradation or failure.
2862345fc
6
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
Tꢂ = 25°Cꢁ VCC = VL = 3.3Vꢁ unless otherwise noted.
Typical perForMance characTerisTics
Supply Current vs VCC
Supply Current vs Temperature
Supply Current vs Data Rate
10000
1000
100
10
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
20
16
12
8
250
200
150
100
50
R
C
= 54Ω
I
DIFF
L
CCTRS
= 100pF
I
CCTRS
I
CCTR
SLEW LIMITED
NON SLEW LIMITED
4
1
I
CCTR
I
CCS
0
0
0.1
3.0
4.0
V
4.5
(V)
5.0
5.5
30
35
45
50
55
60
3.5
40
–50
0
50
100
150
SUPPLY CURRENT (mA)
CC
TEMPERATURE (°C)
2862345 G01
2862345 G03
2862345 G02
Driver Output Short-Circuit
Current vs Voltage
Driver Propagation Delay vs
Temperature
Driver Skew vs Temperature
1.5
1.0
120
35
1000
200
150
100
50
R
L
= 54Ω
R
L
= 54Ω
DIFF
= 100pF
DIFF
C
C
= 100pF
100
80
OUTPUT LOW
NON SLEW LIMITED
SLEW LIMITED
900
800
700
0.5
30
25
20
0.0
60
0
–50
–100
–150
–200
40
–0.5
–1.0
SLEW LIMITED
OUTPUT HIGH
20
NON SLEW LIMITED
–1.5
0
–50
50
100
150
–50
50
100
150
0
0
–60
–20
0
20
40
60
–40
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
2862345 G04
2862345 G05
2862345 G06
Driver Output Low/High Voltage
vs Output Current
Driver Differential Output Voltage
vs Temperature
VL Supply Current vs Data Rate
3.5
3.0
2.5
2.3
2.1
1.9
1.7
600
500
400
300
200
100
0
C
V
(RO) = 15pF
CC
L
= 5V
R
DIFF
= 100Ω
V
OH
V
= 5V
L
2.5
2.0
1.5
1.0
0.5
0.0
V
= 3.3V
L
R
DIFF
= 54Ω
V
OL
V
L
= 2.5V
V
= 1.8V
L
1.5
0
20
30
40
50
–50
50
100
150
10
0
0
10
DATA RATE (Mbps)
15
20
5
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
2862345 G07
2862345 G08
2862345 G09
2862345fc
7
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
Tꢂ = 25°Cꢁ VCC = VL = 3.3Vꢁ unless otherwise noted.
Typical perForMance characTerisTics
Receiver Output Voltage vs
Receiver Propagation Delay
vs Temperature
Output Current (Source and Sink)
Receiver Skew vs Temperature
6.0
5.0
4.0
3.0
2.0
1.0
0.0
58
56
54
52
50
48
46
–1.6
V
C
= 1.5V
V = 1.5V
AB
C = 15pF
L
V
= 5.5V
AB
= 15pF
L
L
–1.8
–2.0
–2.2
–2.4
–2.6
V
V
= 3.3V
L
= 2.25V
L
V
= 1.65V
4.0
L
V
L
= 1.65V TO 5.5V
2.0
0.0
6.0
8.0
–50
50
100
150
–50
50
100
150
0
0
OUTPUT CURRENT (ABSOLUTE VALUE) (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
2862345 G10
2862345 G11
2862345 G12
pin FuncTions
PIN NUMBER
PIN
NꢂME
LTC28±4 LTC28±4
DESCRIPTION
LTC28±2 LTC28±3
(DFN)
(SO)
LTC28±5
RO
1
2
3
4
2
1
2
1
Receiver Output. If the receiver output is enabled (RE low) and A–B > 200mV,
then RO will be high. If A–B < –200mV, then RO will be low. If the receiver
inputs are open, shorted, or terminated without a signal, RO will be high.
RE
DE
DI
-
2
3
4
3
4
5
2
3
4
Receiver Enable. A low input enables the receiver. A high input forces the
receiver output into a high impedance state. If RE is high with DE low, the part
will enter a low power shutdown state.
-
Driver Enable. A high input on DE enables the driver. A low input will force the
driver outputs into a high impedance state. If DE is low with RE high, the part
will enter a low power shutdown state.
3
Driver Input. If the driver outputs are enabled (DE high), then a low on DI
forces the driver noninverting output Y low and inverting output Z high. A high
on DI, with the driver outputs enabled, forces the driver noninverting output Y
high and inverting output Z low.
V
-
-
-
-
5
Logic Supply: 1.65V ≤ V ≤ V . Bypass with 0.1µF ceramic capacitor. Powers
L CC
RO, RE, DE, DI and SLO interfaces on LTC2865 only.
Ground.
L
GND
5
9
-
4
9
-
5
11
-
6, 7
6
13
7
Exposed Pad
SLO
-
-
Connect the exposed pads on the DFN and MSOP packages to GND
Slow Mode Enable. A low input switches the transmitter to the slew rate
limited 250kbps max data rate mode. A high input supports 20Mbps.
Y
Z
B
A
-
-
5
6
7
8
1
6
7
9
8
Noninverting Driver Output for LTC2863, LTC2864, LTC2865.
High-impedance when driver disabled or unpowered.
10
11
12
9
Inverting Driver Output for LTC2863, LTC2864, LTC2865.
High-impedance when driver disabled or unpowered.
7
6
8
8
10
11
12
Inverting Receiver Input (and Inverting Driver Output for LTC2862).
Impedance is > 96kΩ in receive mode or unpowered.
9
Noninverting Receiver Input (and Noninverting Driver Output for LTC2862).
Impedance is > 96kΩ in receive mode or unpowered.
V
CC
10
14
Power Supply. 3V < V < 5.5V. Bypass with 0.1µF ceramic capacitor to GND.
CC
NC
1, 8, 13
Unconnected Pins. Float or connect to GND.
2862345fc
8
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
FuncTion Tables
LTC28±2
LTC28±4ꢁ LTC28±5:
LOGIC INPUTS
LOGIC INPUTS
MODE
ꢂꢁ B
RO
MODE
ꢂꢁ B
Yꢁ Z
RO
DE
0
RE
0
DE
0
RE
0
Receive
Shutdown
Transceive
Transmit
R
R
Active
High-Z
Active
High-Z
Receive
Shutdown
Transceive
Transmit
R
R
R
R
High-Z
High-Z
Active
Active
Active
High-Z
Active
High-Z
IN
IN
IN
IN
IN
0
1
0
1
IN
1
0
Active
Active
1
0
1
1
1
1
block DiaGraMs
LTC28±2
LTC28±3
V
CC
V
CC
A*
B*
RO
RO
RECEIVER
RECEIVER
A*
B*
RE
MODE CONTROL
DE
LOGIC
Z*
Y*
DI
DRIVER
DI
DRIVER
GND
2862345 BDb
*15kV ESD
GND
2862345 BDa
*15kV ESD
LTC28±4
LTC28±5
V
V
CC
CC
VL
A*
A*
RO
RO
RECEIVER
RECEIVER
B*
B*
RE
RE
MODE CONTROL
LOGIC
MODE CONTROL
LOGIC
DE
DE
Z*
Y*
Z*
Y*
DI
DI
DRIVER
DRIVER
SLO
GND
GND
2862345 BDc
2862345 BDd
*15kV ESD
*15kV ESD
2862345fc
9
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
TesT circuiTs
Y**
Z**
Y**
R
I
OSD
+
GND
OR
CC
GND
OR
CC
V
DI
DRIVER
DI
DRIVER
OD
–
V
*
V
*
+
R
+
–60V TO 60V
V
OC
–
–
Z**
2862345 FO2
2862345 FO1
*LTC2865 ONLY: SUBSTITUTE V FOR V
*LTC2865 ONLY: SUBSTITUTE V FOR V
L
CC
L
CC
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
Figure ꢀ. Driver DC Characteristics
Figure 2. Driver Output Short-Circuit Current
I
IN
A OR B
B OR A
RECEIVER
+
V
IN
–
2862345 FO3
V
I
IN
IN
R
=
IN
Figure 3. Receiver Input Current and Input Resistance
V
*
CC
Y**
Z**
DI
t
t
PHLD
PLHD
C
C
L
0V
DI
t
SKEWD
R
DIFF
DRIVER
1/2 V
O
V
Y, Z
O
L
2862345 FO4
90%
90%
(Y–Z)
0
0
10%
10%
t
RD
t
FD
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
2862345 F04b
*LTC2865 ONLY: SUBSTITUTE V FOR V
CC
L
Figure 4. Driver Timing Measurement
2862345fc
10
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
TesT circuiTs
GND
OR
CC
R
R
L
L
Y**
Z**
V
DE
*
CC
1/2 V
*
V
CC
C
C
t
t
,
L
ZLD
ZLSD
0V
V
*
CC
t
LZD
DI
DRIVER
DE
OR
V
CC
GND
1/2 V
1/2 V
Y OR Z
Z OR Y
CC
V
CC
0.5V
0.5V
V
V
OL
OR
GND
OH
0V
L
CC
2862345 F05b
t
,
t
,
HZD
ZHD
t
t
ZHSD
SHDN
*LTC2865 ONLY: SUBSTITUTE V FOR V
L
CC
**LTC2862 ONLY: SUBSTITUTE A, B FOR Y, Z
2862345 FO5
*LTC2865 ONLY: SUBSTITUTE V FOR V
L
CC
Figure 5. Driver Enable and Disable Timing Measurements
t
= |t
– t |
PLHR PHLR
SKEWR
V
AB
V
/2
/2
A–B
–V
0
AB
A
B
AB
RO
t
t
PLHR
PHLR
V
RECEIVER
CM
V
V
*
CC
90%
10%
90%
10%
C
1/2 V
*
1/2 V *
CC
RO
L
CC
AB
0
2862345 F06b
t
t
FR
RR
2862345 FO6a
*LTC2865 ONLY: SUBSTITUTE V FOR V
CC
L
Figure ±. Receiver Propagation Delay Measurements
V
RE
*
CC
CC
t
t
,
ZLR
ZLSR
1/2 V *
CC
A
B
0V OR V
CC
R
L
0V
V *
CC
RO
t
LZR
OR
RECEIVER
V
*
GND
C
1/2 V
1/2 V
*
*
V
OR 0V
RO
L
CC
CC
CC
0.5V
0.5V
V
OL
RE
DI = 0V OR V
*
CC
V
OH
RO
0V
2862345 F07b
2862345 FO7a
t
,
t
,
HZR
ZHR
t
t
ZHSR
SHDNR
*LTC2865 ONLY: SUBSTITUTE V FOR V
L
CC
*LTC2865 ONLY: SUBSTITUTE V FOR V
L
CC
Figure 7. Receiver Enable/Disable Time Measurements
2862345fc
11
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
±±6V Fault Protection
±25V Extended Common Mode Range
The LTC2862-LTC2865 devices answer application needs
for overvoltage fault-tolerant RS485/RS422 transceivers
operating from 3V to 5.5V power supplies. Industrial
installations may encounter common mode voltages
between nodes far greater than the –7V to 12V range
specified by the RS485 standards. Standard RS485
transceiverscanbedamagedbyvoltagesabovetheirtypical
absolute maximum ratings of –8V to 12.5V. The limited
overvoltage tolerance of standard RS485 transceivers
makes implementation of effective external protection
networks difficult without interfering with proper data
network performance within the –7V to 12V region of
RS485operation. ReplacingstandardRS485transceivers
withtheruggedLTC2862-LTC2865devicesmayeliminate
fieldfailuresduetoovervoltagefaultswithoutusingcostly
external protection devices.
To further increase the reliability of operation and extend
functionality in environments with high common mode
voltages due to electrical noise or local ground potential
differences due to ground loops, the LTC2862-LTC2865
devices feature an extended common mode operating
range of –25V to 25V. This extended common mode
range allows the LTC2862-LTC2865 devices to transmit
and receive under conditions that would cause data errors
and possible device damage in competing products.
±ꢀ5kV ESD Protection
The LTC2862 series devices feature exceptionally robust
ESD protection. The transceiver interface pins (A,B,Y,Z)
feature protection to 15kV HBM with respect to GND
without latchup or damage, during all modes of operation
orwhileunpowered.Alltheotherpinsareprotectedto 8kV
HBMtomakethisacomponentcapableofreliableoperation
under severe environmental conditions.
The 60V fault protection of the LTC2862 series is
achievedbyusingahigh-voltageBiCMOSintegratedcircuit
technology. The naturally high breakdown voltage of this
technology provides protection in powered-off and high-
impedanceconditions.Thedriveroutputsuseaprogressive
foldbackcurrentlimitdesigntoprotectagainstovervoltage
faults while still allowing high current output drive.
Driver
ThedriverprovidesfullRS485/RS422compatibility.When
enabled, if DI is high, Y–Z is positive for the full-duplex
devices (LTC2863-LTC2865) and A–B is positive for the
half-duplex device (LTC2862).
TheLTC2862seriesisprotectedfrom 60Vfaultsevenwith
GNDopen,orV openorgrounded.Additionalprecautions
When the driver is disabled, both outputs are high-
impedance. For the full-duplex devices, the leakage on
the driver output pins is guaranteed to be less than 30µA
over the entire common mode range of –25V to 25V. On
the half-duplex LTC2862, the impedance is dominated by
CC
must be taken in the case of V present and GND open.
CC
The LTC2862 series chip will protect itself from damage,
but the chip ground current may flow out through the ESD
diodes on the logic I/O pins and into associated circuitry.
The system designer should examine the susceptibility
of the associated circuitry to damage if the condition of a
the receiver input resistance, R .
IN
GND open fault with V present is anticipated.
Driver Overvoltage and Overcurrent Protection
CC
The high voltage rating of the LTC2862 series makes it
simple to extend the overvoltage protection to higher
levels using external protection components. Compared
to lower voltage RS485 transceivers, external protection
devices with higher breakdown voltages can be used, so
as not to interfere with data transmission in the presence
of large common mode voltages. The Typical Applications
section shows a protection network against faults up to
360V peak, while still maintaining the extended 25V
common mode range on the signal lines.
The driver outputs are protected from short circuits to any
voltage within the Absolute Maximum range of –60V to
60V. Themaximumcurrentinafaultconditionis 250mA.
Thedriverincludesaprogressivefoldbackcurrentlimiting
circuit that continuously reduces the driver current limit
with increasing output fault voltage. The fault current is
less than 15mA for fault voltages over 40V.
All devices also feature thermal shutdown protection that
disablesthedriverandreceiverincaseofexcessivepower
dissipation (see Note 4).
2862345fc
12
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
Full Failsafe Operation
the positive and negative thresholds. If this condition
persists for more than about 3µs the failsafe condition is
asserted and the RO pin is forced to the logic 1 state. This
circuit provides full failsafe operation with no negative
impact to receiver duty cycle symmetry, as shown in
Figure 8. The input signal in Figure 8 was obtained by
drivinga10MbpsRS485signalthrough1000feetofcable,
thereby attenuating it to a 200mV signal with slow rise
and fall times. Good duty cycle symmetry is observed at
RO despite the degraded input signal.
Whentheabsolutevalueofthedifferentialvoltagebetween
the A and B pins is greater than 200mV with the receiver
enabled, the state of RO will reflect the polarity of (A–B).
These parts have a failsafe feature that guarantees the
receiver output will be in a logic 1 state (the idle state)
when the inputs are shorted, left open, or terminated but
not driven, for more than about 3µs. The delay allows
normal data signals to transition through the threshold
regionwithoutbeinginterpretedasafailsafecondition.This
failsafe feature is guaranteed to work for inputs spanning
the entire common mode range of –25V to 25V.
Enhanced Receiver Noise Immunity
An additional benefit of the fully symmetric receiver
thresholds is enhanced receiver noise immunity. The
differential input signal must go above the positive
threshold to register as a logic 1 and go below the
negative threshold to register as a logic 0. This provides
a hysteresis of 150mV (typical) at the receiver inputs for
any valid data signal. (An invalid data condition such as
a DC sweep of the receiver inputs will produce a different
observed hysteresis due to the activation of the failsafe
circuit.) Competing devices that employ a negative offset
of the input threshold voltage generally have a much
smaller hysteresis and subsequently have lower receiver
noise immunity.
Most competing devices achieve the failsafe function by a
simple negative offset of the input threshold voltage. This
causes the receiver to interpret a zero differential voltage
as a logic 1 state. The disadvantage of this approach is
the input offset can introduce duty cycle asymmetry at the
receiver output that becomes increasingly worse with low
input signal levels and slow input edge rates.
Other competing devices use internal biasing resistors to
create a positive bias at the receiver inputs in the absence
of an external signal. This type of failsafe biasing is
ineffectiveifthenetworklinesareshorted,orifthenetwork
is terminated but not driven by an active transmitter.
RS485 Network Biasing
A, B
RS485 networks are usually biased with a resistive divider
to generate a differential voltage of ≥200mV on the data
lines, which establishes a logic 1 state (the idle state)
when all the transmitters on the network are disabled. The
values of the biasing resistors are not fixed, but depend
on the number and type of transceivers on the line and
the number and value of terminating resistors. Therefore,
the values of the biasing resistors must be customized to
eachspecificnetworkinstallation,andmaychangeifnodes
are added to or removed from the network.
200mV/DIV
A–B
200mV/DIV
RO
1.6V/DIV
2862345 F08
40ns/DIV
Figure 8. Duty Cycle of Balanced Receiver with ±266mV
ꢀ6Mbps Input Signal
The internal failsafe feature of the LTC2862-LTC2865
eliminates the need for external network biasing resistors
provided they are used in a network of transceivers with
similar internal failsafe features. The LTC2862-LTC2865
transceivers will operate correctly on biased, unbiased,
or under-biased networks.
The LTC2862 series uses fully symmetric positive and
negativereceiverthresholds(typically 75mV)tomaintain
gooddutycyclesymmetryatlowsignallevels. Thefailsafe
operation is performed with a window comparator to
determinewhenthedifferentialinputvoltagefallsbetween
2862345fc
13
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
Hi-Z State
There are no power-up sequence restrictions on the
LTC2865.However,correctoperationisnotguaranteedfor
The receiver output is internally driven high (to V or V )
CC
L
V > V .
L
CC
orlow(toGND)withnoexternalpull-upneeded. Whenthe
receiver is disabled the RO pin becomes Hi-Z with leakage
of less than 5ꢀA for voltages within the supply range.
Shutdown Mode Delay
TheLTC2862,LTC2864,andLTC2865featurealowpower
shutdown mode that is entered when both the driver and
the receiver are simultaneously disabled (pin DE low and
REhigh). Ashutdownmodedelayofapproximately250ns
(not tested in production) is imposed after this state is
receivedbeforethechipentersshutdown.IfeitherDEgoes
high or RE goes low during this delay, the delay timer is
reset and the chip does not enter shutdown. This reduces
the chance of accidentally entering shutdown if DE and
RE are driven in parallel by a slowly changing signal or if
DE and RE are driven by two independent signals with a
timing skew between them.
High Receiver Input Resistance
ThereceiverinputloadfromAorBtoGNDfortheLTC2863,
LTC2864, and LTC2865 is less than one-eighth unit load,
permitting a total of 256 receivers per system without
exceeding the RS485 receiver loading specification. All
grades of the LTC2862 and the H- and MP-grade devices
of the LTC2863, LTC2864, and LTC2865 have an input
load less than one-seventh unit load over the complete
temperaturerangeof–40°Cto125°C. Theincreasedinput
load specification for these devices is due to increased
junction leakage at high temperature and the transmitter
circuitry sharing the A and B pins on the LTC2862. The
inputloadofthereceiverisunaffectedbyenabling/disabling
the receiver or by powering/unpowering the part.
This shutdown mode delay does not affect the outputs of
the transmitter and receiver, which start to switch to the
high impedance state upon the reception of their respec-
tive disable signals as defined by the parameters t
SHDND
Supply Current
and t
. The shutdown mode delay affects only the
SHDNR
The unloaded static supply currents in these devices
are low —typically 900ꢀA for non slew limited devices
and 3.3mA for slew limited devices. In applications
with resistively terminated cables, the supply current is
dominatedbythedriverload.Forexample,whenusingtwo
120Ω terminators with a differential driver output voltage
of 2V, the DC load current is 33mA, which is sourced by
thepositivevoltagesupply.Powersupplycurrentincreases
with toggling data due to capacitive loading and this term
can increase significantly at high data rates. A plot of
the supply current vs data rate is shown in the Typical
Performance Characteristics of this data sheet.
time when all the internal circuits that draw DC power
from V are turned off.
CC
High Speed Considerations
Agroundplanelayoutwitha0.1µFbypasscapacitorplaced
lessthan7mmawayfromtheV pinisrecommended.The
CC
PC board traces connected to signals A/B and Z/Y should
be symmetrical and as short as possible to maintain good
differentialsignalintegrity. Tominimizecapacitiveeffects,
the differential signals should be separated by more than
the width of a trace and should not be routed on top of
each other if they are on different signal planes.
During fault conditions with a positive voltage larger than
thesupplyvoltageappliedtothetransmitterpins,orduring
transmitter operation with a high positive common mode
voltage, positive current of up to 80mA may flow from the
Care should be taken to route outputs away from any
sensitive inputs to reduce feedback effects that might
cause noise, jitter, or even oscillations. For example, in
the full-duplex devices, DI and A/B should not be routed
near the driver or receiver outputs.
transmitter pins back to V . If the system power supply
CC
or loading cannot sink this excess current, a 5.6V 1W
1N4734 Zener diode may be placed between V and GND
CC
The logic inputs have a typical hysteresis of 100mV to
provide noise immunity. Fast edges on the outputs can
causeglitchesinthegroundandpowersupplieswhichare
to prevent an overvoltage condition on V .
CC
2862345fc
14
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
exacerbated by capacitive loading. If a logic input is held
near its threshold (typically V /2 or V /2), a noise glitch
lengths, these transition times become a significant part
of the signal bit time. Jitter and intersymbol interference
aggravate this so that the time window for capturing valid
data at the receiver becomes impossibly small.
CC
L
fromadrivertransitionmayexceedthehysteresislevelson
the logic and data input pins, causing an unintended state
change. This can be avoided by maintaining normal logic
levels on the pins and by slewing inputs faster than 1V/
ꢀs. Goodsupplydecouplingandproperdrivertermination
also reduce glitches caused by driver transitions.
The boundary at 20Mbps in Figure 9 represents the
guaranteed maximum operating rate of the LTC2862
series. The dashed vertical line at 10Mbps represents the
specified maximum data rate in the RS485 standard. This
boundary is not a limit, but reflects the maximum data
rate that the specification was written for.
RS485 Cable Length vs Data Rate
Many factors contribute to the maximum cable length
that can be used for RS485 or RS422 communication,
including driver transition times, receiver threshold, duty
cycle distortion, cable properties and data rate. A typical
curve of cable length versus maximum data rate is shown
in Figure 9. Various regions of this curve reflect different
performance limiting factors in data transmission.
It should be emphasized that the plot in Figure 9 shows
a typical relation between maximum data rate and
cable length. Results with the LTC2862 series will vary,
depending on cable properties such as conductor gauge,
characteristic impedance, insulation material, and solid
versus stranded conductors.
Atfrequenciesbelow100kbps,themaximumcablelengthis
determined by DC resistance in the cable. In this example,
a cable longer than 4000ft will attenuate the signal at the
far end to less than what can be reliably detected by the
receiver.
Low EMI 256kbps Data Rate
The LTC2862-2, LTC2863-2, and the LTC2864-2 feature
slew rate limited transmitters for low electromagnetic
interference (EMI) in sensitive applications. In addition,
theLTC2865hasalogic-selectable250kbpstransmitrate.
The slew rate limit circuit maintains consistent control of
transmitter slew rates across voltage and temperature to
ensure low EMI under all operating conditions. Figure 10
demonstrates the reduction in high frequency content
achieved by the 250kbps mode compared to the 20Mbps
mode.
For data rates above 100kbps the capacitive and inductive
propertiesofthecablebegintodominatethisrelationship.
The attenuation of the cable is frequency and length
dependent, resulting in increased rise and fall times at
the far end of the cable. At high data rates or long cable
20
80
10k
0
60
NON SLEW LIMITED
–20
–40
40
1k
20
LOW EMI
MODE
–60
0
SLO = GND
100
–80
–20
–40
–60
RS485
STANDARD
SPEC
–100
–120
SLEW LIMITED
10
10
0
4
6
8
12
2
10k
100k
1M
10M
100M
FREQUENCY (MHz)
DATA RATE (bps)
2862345 F10
2862345 F09
Figure 9. Cable Length vs Data Rate (RS485/RS422 Standard
Shown in Vertical Solid Line)
Figure ꢀ6. High Frequency EMI Reduction of Slew Limited
256kbps Mode Compared to Non Slew Limited 26Mbps Mode
2862345fc
15
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
The 250kbps mode has the added advantage of reducing
signal reflections in an unterminated network, and there-
by increasing the length of a network that can be used
without termination. Using the rule of thumb that the rise
time of the transmitter should be greater than four times
the one-way delay of the signal, networks of up to 140
feet can be driven without termination.
cable to attenuate the transmitted signal to meet the
PROFIBUSupperlimitof7Vwhilestillprovidingenough
drive strength to meet the lower limit of 4V.
4. The LTC2865 family transceiver should be powered by
a 5% tolerance 5V supply (4.75V to 5.25V) to ensure
that the PROFIBUS V tolerances are met.
OD
ꢂuxiliary Protection For IEC Surgeꢁ EFT and ESD
PROFIBUS Compatible Interface
An interface transceiver used in an industrial setting
may be exposed to extremely high levels of electrical
overstress due to phenomena such as lightning surge,
electrical fast transient (EFT) from switching high current
inductive loads, and electrostatic discharge (ESD) from
the discharge of electrically charged personnel or equip-
ment. Test methods to evaluate immunity of electronic
equipment to these phenomenon are defined in the IEC
standards 61000-4-2, 61000-4-4, and 61000-4-5, which
address ESD, EFT, and surge, respectively. The transi-
ents produced by the EFT and particularly the surge tests
contain much more energy than the ESD transients. The
LTC2865 family is designed for high robustness against
ESD, but the on-chip protection is not able to absorb the
energy associated with the 61000-4-5 surge transients.
Therefore,aproperlydesignedexternalprotectionnetwork
is necessary to achieve a high level of surge protection,
and can also extend the ESD and EFT performance of the
LTC2865 family to extremely high levels.
PROFIBUS is an RS485-based field bus. In addition
to the specifications of TIA/EIA-485-A, the PROFIBUS
specification contains additional requirements for cables,
interconnects, line termination, and signal levels. The
followingdiscussionappliestothePROFIBUSTypeAcables
with associated connectors and termination. The Type A
cable is a twisted pair shielded cable with a characteristic
impedance of 135Ω to 165Ω and a loop resistance of
< 110Ω/km.
The LTC2865 family of RS485 transceivers may be used
in PROFIBUS compatible equipment if the following
considerations are implemented. (Please refer to the
schematic of the PROFIBUS Compatible Interface in the
Typical Applications Section.)
1. The polarity of the PROFIBUS signal is opposite to the
polarity convention used in this data sheet. The PRO-
FIBUS B wire is driven by a non-inverted signal, while
the A wire is driven by an inverted signal. Therefore,
it is necessary to swap the output connections from
the transceiver. Pin A is connected to the PROFIBUS B
wire, and Pin B is connected to the PROFIBUS A wire.
In addition to providing surge, EFT and ESD protection,
an external network should preserve or extend the ability
of the LTC2865 family to withstand overvoltage faults,
operate over a wide common mode, and communicate
at high frequencies. In order to meet the first two
requirements, protection components with suitably high
conduction voltages must be chosen. A means to limit
current must be provided to prevent damage in case
a secondary protection device or the ESD cell on the
LTC2865 family fires and conducts. The capacitance of
thesecomponentsmustbekeptlowinordertopermithigh
frequency communication over a network with multiple
nodes. Meetingtherequirementsforconductingveryhigh
energyelectricaltransientswhilemaintaininghighhold-off
voltages and low capacitance is a considerable challenge.
2. Each end of the PROFIBUS line is terminated with a
220Ω resistor between B and A, a 390Ω pull-up resis-
tor between B and V , and a 390Ω pull-down resistor
CC
be-tweenAandGND.Thisprovidessuitabletermination
for the 150Ω twisted pair transmission cable.
3. The peak to peak differential voltage V received at
OD
the end of a 100m cable with the cable and termina-
tions described above must be greater than 4V and less
than 7V. The LTC2865 family produces signal levels in
excess of 7V when driving this network directly. 8.2Ω
resistors may be inserted between the A and B pins of
the transceiver and the B and A pins of the PROFIBUS
2862345fc
16
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
applicaTions inForMaTion
A protection network shown in the Typical Applications
section (network for IEC level 4 protection against surge,
EFT and ESD) meets this challenge. The network provides
the following protection:
The gas discharge tubes (GDTs) provide the primary pro-
tection against electrical surges. These devices provide a
very low impedance and high current carrying capability
when they fire, safely discharging the surge current to
GND. The transient blocking units (TBUs) are solid state
devices that switch from a low impedance pass through
state to a high impedance current limiting state when a
specified current level is reached. These devices limit the
current and power that can pass through to the secondary
protection. The secondary protection consists of a
bidirectionalthyristor,whichtriggersabove35Vtoprotect
the bus pins of the LTC2865 family transceiver. The high
trigger voltage of the secondary protection maintains the
full 25V common mode range of the receivers. The final
component of the network is the metal oxide varistors
(MOVs) which are used to clamp the voltage across the
TBUs to protect them against fast ESD and EFT transients
which exceed the turn-on time of the GDT.
• IEC 61000-4-2 ESD Level 4: 30KV contact, 30kV air
(linetoGND,directdischargetobuspinswithtransceiver
and protection circuit mounted on a ground referenced
test card per Figure 4 of the standard)
• IEC 61000-4-4 EFT Level 4: 5KV (line to GND, 5kHz
repetition rate, 15ms burst duration, 60 second test
duration, discharge coupled to bus pins through 100pF
capacitor per paragraph 7.3.2 of the standard)
• IEC 61000-4-5 Surge Level 4: 5KV (line to GND, line to
line, 8/20µs waveform, each line coupled to generator
through 80Ω resistor per Figure 14 of the standard)
This protection circuit adds only ~8pF of capacitance per
line(linetoGND),therebyprovidinganextremelyhighlevel
ofprotectionwithoutsignificantimpacttotheperformance
of the LTC2865 family transceivers at high data rates.
The high performance of this network is attributable to
the low capacitance of the GDT and thyristor primary
and secondary protection devices. The high capacitance
MOV floats on the line and is shunted by the TBU, so it
contributes no appreciable capacitive load on the signal.
Typical applicaTions
PROFIBUS Compatible Line Interface
V
CC
(4.75V TO 5.25V)
V
CC
V
CC
LTC2862-1
390Ω
390Ω
8.2Ω
8.2Ω
RO
A*
B*
B WIRE
A WIRE
B WIRE
100m
V
RE
220Ω
390Ω
220Ω
390Ω
OD
5.5Ω/WIRE
DI
A WIRE
DE
4V ≤ V ≤ 7V AT 12Mbps
P-P
OD
P-P
GND
* THE POLARITY OF A AND B IN THIS DATA SHEET IS OPPOSITE THE POLARITY DEFINED BY PROFIBUS.
2862345 TA02
2862345fc
17
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
Typical applicaTions
Bidirectional ±±6V 26Mbps Level Shifter/Isolator
C
LTC2863-1
LTC2863-1
R1
A
B
Y
Z
V
V
CC
CC
DI
RO
R2
DATA OUT 2
DATA IN 2
R1
C
C
R1
A
B
Y
Z
DI
RO
DATA IN 1
DATA OUT 1
R2
R1
C
GND
V
V
CC
CC
GND
6ꢀV
2862345 TAꢀ3
R1 = 1ꢀꢀk 1%. PLACE R1 RESISTORS NEAR A AND B PINS.
R2 = 1ꢀk
C = 47pF, 5%, 5ꢀ WVDC. MAY BE OMITTED FOR DATA RATES ≤ 1ꢀꢀkbps.
Failsafe O ꢂpplication (Idle State = Logic O)
5V
LTC2862
RO
V
I1
RO
CC
B
R
“A”
“B”
DE
DI/
A
DE
DI
D
GND
I2
2862345 TA04
2862345fc
18
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
SO8 REV G 0212
2862345fc
19
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05
2.10 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.125
0.40 ± 0.10
TYP
5
8
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 0509 REV C
4
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.38 ±0.10
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
2862345fc
20
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.337 – .344
.045 .005
(8.560 – 8.738)
.050 BSC
NOTE 3
13
12
11
10
8
14
N
9
N
1
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
7
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
.010 – .020
(0.254 – 0.508)
× 45
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S14 REV G 0212
NOTE:
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
2862345fc
21
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
ꢀ6-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
0.70 ±0.05
3.55 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.125
0.40 ± 0.10
TYP
6
10
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
PIN 1
TOP MARK
(SEE NOTE 6)
0.35 × 45°
CHAMFER
(DD) DFN REV C 0310
5
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
2862345fc
22
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DE/UE Package
ꢀ2-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695 Rev D)
0.70 ±0.05
3.30 ±0.05
3.60 ±0.05
2.20 ±0.05
1.70 ± 0.05
PACKAGE OUTLINE
0.25 ± 0.05
0.50 BSC
2.50 REF
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
0.40 ± 0.10
4.00 ±0.10
(2 SIDES)
R = 0.115
TYP
7
12
R = 0.05
TYP
3.30 ±0.10
3.00 ±0.10
(2 SIDES)
1.70 ± 0.10
PIN 1
TOP MARK
(NOTE 6)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
(UE12/DE12) DFN 0806 REV D
6
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.50 REF
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING PROPOSED TO BE A VARIATION OF VERSION
(WGED) IN JEDEC PACKAGE OUTLINE M0-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
2862345fc
23
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
packaGe DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MSE Package
ꢀ2-Lead Plastic MSO ꢁ Exposed Die Pad
(Reference LTC DWG # 05-08-1666 Rev G)
BOTTOM VIEW OF
EXPOSED PAD OPTION
2.845 ±0.102
2.845 ±0.102
(.112 ±.004)
0.889 ±0.127
(.035 ±.005)
(.112 ±.004)
1
6
0.35
REF
1.651 ±0.102
(.065 ±.004)
5.10
(.201)
MIN
1.651 ±0.102
(.065 ±.004)
3.20 – 3.45
(.126 – .136)
0.12 REF
DETAIL “B”
CORNER TAIL IS PART OF
THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
NO MEASUREMENT PURPOSE
DETAIL “B”
12
7
0.65
(.0256)
BSC
0.42 ±0.038
4.039 ±0.102
(.159 ±.004)
(NOTE 3)
(.0165 ±.0015)
TYP
0.406 ±0.076
RECOMMENDED SOLDER PAD LAYOUT
(.016 ±.003)
12 11 10 9 8 7
REF
DETAIL “A”
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
0° – 6° TYP
4.90 ±0.152
(.193 ±.006)
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
1
2 3 4 5 6
DETAIL “A”
0.86
(.034)
REF
1.10
(.043)
MAX
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.1016 ±0.0508
(.004 ±.002)
MSOP (MSE12) 0213 REV G
0.650
(.0256)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL
NOT EXCEED 0.254mm (.010") PER SIDE.
2862345fc
24
For more information www.linear.com/LTC2862
LTC2862/LTC2863/
LTC2864/LTC2865
revision hisTory
REV
DꢂTE
DESCRIPTION
PꢂGE NUMBER
A
03/13 Added MP-Grade to Data Sheet
Updated S8 and S Package
2, 4
17, 19
4
B
01/14 Changed I
for H-/MP-Grade.
CCS
Added V Supply Current vs Data Rate graph.
7
L
Added Shutdown Mode Delay section.
14
Added PROFIBUS Compatible Interface section, Auxiliary protection For IEC Surge, EFT and ESD section, and
PROFIBUS Compatible Line Interface schematic.
16, 17
Replaced RS485 Network with 120V AC Line Fault Protection schematic with Network for IEC Level 4 Protection
Against Surge, EFT and ESD Plus 360V Overvoltage Protection schematic.
26
C
03/14 Changed part marking for DE package
4
2862345fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnectionofitscircuitsasdescribedhereinwill notinfringeon existing patent rights.
25
LTC2862/LTC2863/
LTC2864/LTC2865
Typical applicaTion
Network for IEC Level 4 Protection gainst Surge EFT and ESD
Plus 36 V Overvoltage Protection
MOV
RS485 A
(EXTERNAL)
V
LTC2862-1
R
CC
DE
A
TBU
RO
DI
GDT
GDT
SCR
GND
T
B
SCR
RE
TBU
GND
RS485 B
(EXTERNAL)
2862345 TA05
MOV
GDT: BOURNS 2031-42T-SM; 420V GAS DISCHARGE TUBE
TBU: BOURNS TBU-CA085-300-WH; 850V TRANSIENT BLOCKING UNIT
MOV: BOURNS MOV-7D391K; 390V 25J METAL OXIDE VARISTOR
SCR: BOURNS TISP4P035L1NR-S; 35V BIDIRECTIONAL THYRISTOR
relaTeD parTs
P RT NUMBER
LT1785, LT1791
LTC2850-53
DESCRIPTION
COMMENTS
60ꢀ ꢁaꢂlꢃ ꢄroꢃecꢃeꢅ ꢆR485/ꢆR422 Tranꢇceiꢈerꢇ
3.3ꢀ 20Mkbꢇ 15ꢉꢀ ꢆR485 Tranꢇceiꢈerꢇ
60ꢀ Toleranꢃ, 15ꢉꢀ ꢊRS, 250ꢉkbꢇ
Ub ꢃo 256 Tranꢇceiꢈerꢇ ꢄer Bꢂꢇ
25ꢉꢀ ꢊRS (LTC2854), 15ꢉꢀ ꢊRS (LTC2855)
15ꢉꢀ ꢊRS
LTC2854, LTC2855 3.3ꢀ 20Mkbꢇ ꢆR485 Tranꢇceiꢈerꢇ wiꢃh Inꢃegraꢃeꢅ Rwiꢃchakle Terminaꢃion
LTC2856-1 ꢁamily 5ꢀ 20Mkbꢇ anꢅ Rlew ꢆaꢃe Limiꢃeꢅ ꢆR485 Tranꢇceiꢈerꢇ
LTC2859, LTC2861 5ꢀ 20Mkbꢇ ꢆR485 Tranꢇceiꢈerꢇ wiꢃh Inꢃegraꢃeꢅ Rwiꢃchakle Terminaꢃion
15ꢉꢀ ꢊRS
LTC1535
LTM2881
Iꢇolaꢃeꢅ ꢆR485 Tranꢇceiꢈer
Combleꢃe 3.3ꢀ Iꢇolaꢃeꢅ ꢆR485/ꢆR422 μMoꢅꢂle® Tranꢇceiꢈer + ꢄower
2500ꢀ
2500ꢀ
Iꢇolaꢃion, ꢆeqꢂireꢇ ꢊxꢃernal Tranꢇceiꢈer
ꢆMR
Iꢇolaꢃion wiꢃh Inꢃegraꢃeꢅ Iꢇolaꢃeꢅ SC/SC
Conꢈerꢃer, 1W ꢄower, Low ꢊMI, 15ꢉꢀ ꢊRS, 30ꢉꢀ/ꢋꢇ
Common Moꢅe Tranꢇienꢃ Immꢂniꢃy
ꢆMR
2862345fc
LT 0314 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarꢃhy Blꢈꢅ., Milbiꢃaꢇ, CA 95035-7417
26
●
●
LINEAR TECHNOLOGY CORPORATION 2011
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LTC2862
相关型号:
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LTC2864IDD-1#PBF
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