LTC486CN#PBF [Linear]
LTC486 - Quad Low Power RS485 Driver; Package: PDIP; Pins: 16; Temperature Range: 0°C to 70°C;
| 型号： | LTC486CN#PBF |
| 厂家： | 
Linear |
| 描述： | LTC486 - Quad Low Power RS485 Driver; Package: PDIP; Pins: 16; Temperature Range: 0°C to 70°C 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总14页 (文件大小：697K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC486
Quad Low Power
RS485 Driver
FEATURES
DESCRIPTION
The LTC®486 is a low power differential bus/line driver
designedformultipointdatatransmissionstandardRS485
applications with extended common-mode range (12V to
–7V). It also meets RS422 requirements.
n
Very Low Power: I = 110µA Typ
CC
n
Designed for RS485 or RS422 Applications
n
Single 5V Supply
n
–7V to 12V Bus Common-Mode Range Permits 7V
GND Difference Between Devices on the Bus
The CMOS design offers significant power savings over
its bipolar counterpart without sacrificing ruggedness
against overload or ESD damage.
n
Thermal Shutdown Protection
n
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion/Removal of Package
n
The driver features three-state outputs, with the driver
outputs maintaining high impedance over the entire
common-moderange.Excessivepowerdissipationcaused
by bus contention or faults is prevented by a thermal
shutdown circuit which forces the driver outputs into a
high impedance state.
Driver Maintains High Impedance in Three-State or
with the Power Off
n
28ns Typical Driver Propagation Delays with 5ns
Skew
n
Pin Compatible with the SN75172, DS96172,
µA96172, and DS96F172
Both AC and DC specifications are guaranteed from 0°C
to 70°C (Commercial), –40°C to 85°C (Industrial), over
the 4.75V to 5.25V supply voltage range.
APPLICATIONS
n
Low Power RS485/RS422 Drivers
L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
n
Level Translator
TYPICAL APPLICATION
RS485 Length Specification
10k
EN
4
EN
1k
4
RECEIVER
1/4 LTC488
2
1
1
120Ω
3
120Ω
DI
DRIVER
12
RO
100
10
4000 FT BELDEN 9841
1/4 LTC486
EN
486 TA01a
10k
100k
1M 2.5M
10M
DATA RATE (bps)
486 TA01b
* APPLIES FOR 24 GAUGE, POLYETHYLENE
DIELECTRIC TWISTED PAIR
486fc
1
LTC486
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
(Note 1)
Supply Voltage (V ) ................................................12V
CC
TOP VIEW
Control Input Voltages .......................0.5V to V + 0.5V
CC
DI1
DO1A
DO1B
EN
1
2
3
4
5
6
7
8
16 V
CC
Driver Input Voltages ...................... –0.5V to V + 0.5V
CC
15 DI4
Driver Output Voltages............................................ 14V
Control Input Currents ......................................... 25mA
Driver Input Currents ........................................... 25mA
Operating Temperature Range
14 DO4A
13 DO4B
DO2B
DO2A
DI2
12
EN
11 DO3B
10 DO3A
LTC486C .................................................. 0°C to 70°C
LTC486I................................................–40°C to 85°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
GND
9
DI3
N PACKAGE
SW PACKAGE
16-LEAD PLASTIC DIP 16-LEAD PLASTIC SO
T
JMAX
= 125°C, θ = 70°C/W (N)
JA
JMAX
T
= 150°C, θ = 95°C/W (SW)
JA
Consult factory for Military grade parts.
ORDER INFORMATION
LEAD FREE FINISH
LTC486CN#PBF
LTC486CSW#PBF
LTC486IN#PBF
TAPE AND REEL
PART MARKING
LTC486CN
PACKAGE DESCRIPTION
16-Lead Plastic DIP
16-Lead Plastic SO
16-Lead Plastic DIP
16-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
LTC486CN#TRPBF
LTC486CSW#TRPBF
LTC486IN#TRPBF
LTC486ISW#TRPBF
LTC486CSW
LTC486IN
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
LTC486ISW#PBF
LTC486ISW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
486fc
2
LTC486
DC ELECTRICAL CHARACTERISTICS
VCC = 5V 5%, 0°C ≤ Temperature ≤ 70°C (Commercial), –40°C ≤ Temperature ≤ 85°C (Industrial) (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
= 0
MIN
TYP
MAX
UNITS
V
V
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (With Load)
I
5
V
V
V
V
OD1
OD2
OUT
R = 50Ω; (RS422)
2
R = 27Ω; (RS485) (Figure 1)
1.5
5
V
V
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output States
R = 27Ω or R = 50Ω
(Figure 1)
0.2
OD
OC
Driver Common-Mode Output Voltage
3
V
V
|V
|
OC
Change in Magnitude of Driver Common-Mode
Output Voltage for Complementary Output States
0.2
V
V
Input High Voltage
Input Low Voltage
Input Current
DI, EN, EN
2.0
V
V
IH
0.8
2
IL
IN1
CC
I
I
µA
Supply Current
No Load
Output Enabled
Output Disabled
110
110
200
200
µA
µA
I
I
I
Driver Short-Circuit Current, V
Driver Short-Circuit Current, V
= High
= Low
V
OUT
V
OUT
V
OUT
= –7V
= 12V
100
100
10
250
250
200
mA
mA
µA
OSD1
OSD2
OZ
OUT
OUT
High Impedance State Output Current
= –7V to 12V
SWITCHING CHARACTERISTICS
VCC = 5V 5%, 0°C ≤ Temperature ≤ 70°C (Commercial), –40°C ≤ Temperature ≤ 85°C (Industrial) (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
= 54Ω, C = C = 100pF
MIN
10
TYP
MAX
50
50
15
25
70
70
70
70
UNITS
ns
t
t
t
Driver Input to Output
R
30
30
5
PLH
DIFF
L1
L2
(Figures 2, 4)
Driver Input to Output
10
ns
PHL
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
ns
SKEW
t , t
r
5
15
35
35
35
35
ns
f
t
t
t
t
C = 100pF (Figures 3, 5) S2 Closed
L
ns
ZH
ZL
LZ
HZ
C = 100pF (Figures 3, 5) S1 Closed
L
ns
C = 15pF (Figures 3, 5) S1 Closed
L
ns
C = 15pF (Figures 3, 5) S2 Closed
L
ns
Note 1: 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: All typicals are given for V = 5V and temperature = 25°C.
CC
486fc
3
LTC486
SWITCHING TIME WAVEFORMS
3V
f = 1MHz : t 10ns : t 10ns
DI
<
<
f
1.5V
1.5V
r
0V
B
t
t
PHL
PLH
V
O
A
t
t
SKEW
1/2 V
1/2 V
SKEW
O
O
V
O
90%
20%
80%
V
= V(A) – V(B)
DIFF
–V
10%
O
t
t
f
r
486 F01
Figure 1. Driver Propagation Delays
3V
0V
5V
f = 1MHz : t 10ns : t 10ns
≤
≤
f
EN
r
1.5V
1.5V
LZ
t
t
ZL
A, B
V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
2.3V
0.5V
OL
V
OH
0.5V
A, B
0V
t
t
HZ
ZH
486 F02
Figure 2. Driver Enable and Disable Times
486fc
4
LTC486
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output High Voltage
vs Output Current TA = 25°C
Driver Differential Output Voltage
vs Output Current TA = 25°C
Driver Output Low Voltage
vs Output Current TA = 25°C
64
48
–96
–72
80
60
32
16
0
–48
–24
0
40
20
0
0
0
1
2
3
4
1
2
3
4
0
1
2
3
4
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
486 G02
486 G01
486 G03
TTL Input Threshold
vs Temperature
Driver Skew vs Temperature
1.63
1.61
1.59
1.57
1.55
5
4
3
2
1
–50
0
50
100
–50
0
50
100
TEMPERATURE (°C )
TEMPERATURE (°C )
486 G05
486 G04
Driver Differential Output Voltage
vs Temperature RO = 54Ω
Supply Current vs Temperature
130
120
110
100
90
2.3
2.1
1.9
1.7
1.5
–50
0
50
100
–50
0
50
100
TEMPERATURE (°C )
TEMPERATURE (°C )
486 G06
486 G07
486fc
5
LTC486
FUNCTION TABLE
INPUT
ENABLES
OUTPUTS
OUTA
DI
EN
EN
OUTB
H
L
H
H
X
X
L
X
X
L
H
L
H
L
Z
L
H
L
H
Z
H: High Level
H
L
L: Low Level
L
X: Irrelevant
Z: High Impedance (Off)
X
H
PIN FUNCTIONS
DI1 (Pin 1): Driver 1 Input. If Driver 1 is enabled, then a
low on DI1 forces the driver outputs DO1A low and DO1B
high. A high on DI1 with the driver outputs enabled will
force DO1A high and DO1B low.
GND (Pin 8): Ground Connection.
DI3 (Pin 9): Driver 3 Input. Refer to DI1.
DO3A (Pin 10): Driver 3 Output.
DO3B (Pin 11): Driver 3 Output.
DO1A (Pin 2): Driver 1 Output.
DO1B (Pin 3): Driver 1 Output.
EN (Pin 12): Driver Outputs Disabled. See Function Table
for details.
EN (Pin 4): Driver Outputs Enabled. See Function Table
fordetails.
DO4B (Pin 13): Driver 4 Output.
DO4A (Pin 14): Driver 4 Output.
DI4 (Pin 15): Driver 4 Input. Refer to DI1.
DO2B (Pin 5): Driver 2 Output.
DO2A (Pin 6): Driver 2 Output.
DI2 (Pin 7): Driver 2 Input. Refer to DI1
V
(Pin 16): Positive Supply; 4.75V < V < 5.25V
CC
CC
486fc
6
LTC486
TEST CIRCUITS
A
B
R
R
V
OD
V
OC
486 F03
Figure 3. Driver DC Test Load
EN
CI1
A
DI
DRIVER
R
DIFF
B
CI2
486 F04
EN
Figure 4. Driver Timing Test Circuit
S1
V
CC
500Ω
OUTPUT
UNDER TEST
C
L
S2
486 F05
Figure 5. Driver Timing Test Load #2
486fc
7
LTC486
APPLICATIONS INFORMATION
EN
EN
SHIELD
SHIELD
4
4
3
2
3
1
120Ω
120Ω
DX
RX
DX
RX
2
1
12
EN
1/4 LTC486
12
EN
EN
EN
1/4 LTC488
4
4
3
1
3
1
DX
DX
RX
RX
2
2
12
EN
1/4 LTC486
12
EN
1/4 LTC488
486 F06
Figure 6. Typical Connection
Typical Application
Cable and Data Rate
A typical connection of the LTC486 is shown in Figure 6.
A twisted pair of wires connect up to 32 drivers and
receivers for half duplex data transmission. There are no
restrictionsonwherethechipsareconnectedtothewires,
and it isn’t necessary to have the chips connected at the
ends. However, the wires must be terminated only at the
endswitharesistorequaltotheircharacteristicimpedance,
typically 120Ω. The optional shields around the twisted
pair help reduce unwanted noise, and are connected to
GND at one end.
The transmission line of choice for RS485 applications is
a twisted pair. There are coaxial cables (twinaxial) made
for this purpose that contain straight pairs, but these are
less flexible, more bulky, and more costly than twisted
pairs. Many cable manufacturers offer a broad range of
120Ω cables designed for RS485 applications.
Lossesinatransmissionlineareacomplexcombinationof
DCconductorloss,AClosses(skineffect),leakage,andAC
losses in the dielectric. In good polyethylene cables such
as the Belden 9841, the conductor losses and dielectric
losses are of the same order of magnitude, with relatively
low overall loss (Figure 7).
Thermal Shutdown
TheLTC486hasathermalshutdownfeaturewhichprotects
the part from excessive power dissipation. If the outputs
of the driver are accidently shorted to a power supply or
low impedance source, up to 250mA can flow through
the part. The thermal shutdown circuit disables the driver
outputs when the internal temperature reaches 150°C and
turns them back on when the temperature cools to 130°C.
If the outputs of two or more LTC486 drivers are shorted
directly, the driver outputs cannot supply enough current
to activate the thermal shutdown. Thus, the thermal shut-
down circuit will not prevent contention faults when two
drivers are active on the bus at the same time.
10
1
0.1
0.1
1
10
100
FREQUENCY (MHz)
486 F07
Figure 7. Attenuation vs Frequency for Belden 9841
486fc
8
LTC486
APPLICATIONS INFORMATION
10k
When using low loss cables, Figure 8 can be used as a
guidelineforchoosingthemaximumlinelengthforagiven
datarate. WithlowerqualityPVCcables, thedielectricloss
factor can be 1000 times worse. PVC twisted pairs have
terrible losses at high data rates (>100kbs) and greatly
reduce the maximum cable length. At low data rates how-
ever, they are acceptable and much more economical.
1k
100
10
Cable Termination
The proper termination of the cable is very important. If
the cable is not terminated with its characteristic imped-
ance, distorted waveforms will result. In severe cases,
distorted (false) data and nulls will occur. A quick look
at the output of the driver will tell how well the cable is
terminated. It is best to look at a driver connected to the
end of the cable, since this eliminates the possibility of
getting reflections from two directions. Simply look at the
driver output while transmitting square wave data. If the
cable is terminated properly, the waveform will look like
a square wave (Figure 9).
10k
100k
1M 2.5M
10M
DATA RATE (bps)
486 F08
Figure 8. Cable Length vs Data Rate
PROBE HERE
Rt
DX
DRIVER
RECEIVER
RX
If the cable is loaded excessively (e.g., 47Ω), the signal
initially sees the surge impedance of the cable and jumps
to an initial amplitude. The signal travels down the cable
and is reflected back out of phase because of the mister-
mination. When the reflected signal returns to the driver,
the amplitude will be lowered. The width of the pedestal
is equal to twice the electrical length of the cable (about
1.5ns/ft). If the cable is lightly loaded (e.g., 470Ω), the
signal reflects in phase and increases the amplitude at the
driver output. An input frequency of 30kHz is adequate for
tests out to 4000 ft. of cable.
Rt = 120Ω
Rt = 47Ω
Rt = 470Ω
486 F09
Figure 9. Termination Effects
AC Cable Termination
Cable termination resistors are necessary to prevent un-
wanted reflections, but they consume power. The typical
differential output voltage of the driver is 2V when the
cable is terminated with two 120Ω resistors. When no
data is being sent 33mA of DC current flows in the cable.
This DC current is about 220 times greater than the supply
current of the LTC486. One way to eliminate the unwanted
current is by AC coupling the termination resistors as
shown in Figure 10.
120Ω
RECEIVER
RX
C
C = LINE LENGTH (FT) × 16.3pF
486 F10
Figure 10. AC Coupled Termination
486fc
9
LTC486
APPLICATIONS INFORMATION
Thecouplingcapacitorallowshighfrequencyenergytoflow
tothetermination, butblocksDCandlowfrequencies. The
dividing line between high and low frequency depends on
the length of the cable. The coupling capacitor must pass
frequencies above the point where the line represents an
electrical one-tenth wavelength. The value of the coupling
capacitorshouldthereforebesetat16.3pFperfootofcable
length for 120Ω cables. With the coupling capacitors in
place, power is consumed only on the signal edges, not
when the driver output is idling at a 1 or 0 state. A 100nF
capacitor is adequate for lines up to 4000 feet in length.
Be aware that the power savings start to decrease once
the data rate surpasses 1/(120Ω × C).
Receiver Open-Circuit Fail-Safe
Some data encoding schemes require that the output of
the receiver maintains a known state (usually a logic 1)
when the data is finished transmitting and all drivers on
thelineareforcedintothree-state.AllLTCRS485receivers
have a fail-safe feature which guarantees the output to be
in a logic 1 state when the receiver inputs are left floating
(open-circuit). However, whenthecableisterminatedwith
120Ω, the differential inputs to the receiver are shorted
together, not left floating.
If the receiver output must be forced to a known state, the
circuits of Figure 11 can be used.
The termination resistors are used to generate a DC bias
which forces the receiver output to a known state, in this
case a logic 0. The first method consumes about 208mW
andthesecondabout8mW.Thelowestpowersolutionisto
use an AC termination with a pull-up resistor. Simply swap
the receiver inputs for data protocols ending in logic 1.
5V
110Ω
110Ω
130Ω
130Ω
RECEIVER
RECEIVER
RX
RX
5V
1.5k
Fault Protection
140Ω
All of LTC’s RS485 products are protected against ESD
transients up to 2kV using the human body model
(100pF, 1.5kΩ). However, some applications need greater
protection. The best protection method is to connect a
bidirectional TransZorb from each line side pin to ground
(Figure 12).
1.5k
C
100k
5V
120Ω
RECEIVER
RX
A TransZorb is a silicon transient voltage suppressor that
has exceptional surge handling capabilities, fast response
time, and low series resistance. They are available from
General Semiconductor Industries and come in a variety
of breakdown voltages and prices. Be sure to pick a break-
down voltage higher than the common-mode voltage
required for your application (typically 12V). Also, don’t
forget to check how much the added parasitic capacitance
will load down the bus.
486 F11
Figure 11. Forcing “0” When All Drivers Are Off
Y
120Ω
DRIVER
Z
486 F12
Figure 12. ESD Protection
486fc
10
LTC486
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N Package
16-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-03-1510 Rev Iꢂ
.770ꢀ
(19.553ꢂ
MAX
14
12
10
9
3
15
1ꢁ
11
16
.255 .015ꢀ
(6.477 0.ꢁ31ꢂ
2
1
ꢁ
4
6
5
7
.ꢁ00 – .ꢁ25
(7.620 – 3.255ꢂ
.1ꢁ0 .005
(ꢁ.ꢁ02 0.127ꢂ
.045 – .065
(1.14ꢁ – 1.651ꢂ
.020
(0.503ꢂ
MIN
.065
(1.651ꢂ
TYP
.003 – .015
(0.20ꢁ – 0.ꢁ31ꢂ
+.0ꢁ5
–.015
.ꢁ25
.120
(ꢁ.043ꢂ
MIN
.013 .00ꢁ
(0.457 0.076ꢂ
.100
(2.54ꢂ
BSC
+0.339
3.255
(
)
–0.ꢁ31
N16 REV I 0711
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
ꢀTHESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mmꢂ
486fc
11
LTC486
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005
.030 .005
TYP
.398 – .413
(10.109 – 10.490)
NOTE 4
15 14
12
10
9
N
16
N
13
11
.325 .005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
N/2
8
1
2
3
N/2
RECOMMENDED SOLDER PAD LAYOUT
2
3
5
7
1
4
6
.291 – .299
(7.391 – 7.595)
NOTE 4
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
.010 – .029
× 45°
(0.254 – 0.737)
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
(0.102 – 0.305)
NOTE 3
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S16 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
486fc
12
LTC486
REVISION HISTORY (Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
11/12 Order Information: corrected Package Descriptions
Added Related Parts section
2
14
486fc
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 interconnection of its circuits as described herein will not infringe on existing patent rights.
13
LTC486
TYPICAL APPLICATION
RS232 to RS485 Level Translator with Hysteresis
R = 220k
Y
10k
120Ω
RS232 IN
DRIVER
5.6k
|VY - VZ|
19k
R
486 TA14
Z
1/4 LTC486
———— ——
HYSTERESIS = 10k ×
≈
R
RELATED PARTS
PART NUMBER
RS485 Quad Drivers
LTC487
DESCRIPTION
COMMENTS
Low Power RS485 Quad Drivers
10Mbps, 4kV ESD, Two DE Pins, SO(W)-16 or DIP-16 Package
100Mbps, 4kV ESD, One-Half DE Pins, SO-16 Package
LTC1688/LTC1689 High Speed RS485 Quad Drivers
RS485 Quad Receivers
LTC1518/LTC1519 High Speed RS485 Quad Receivers
52Mbps, 4kV ESD, SO-16 Package
LTC1520
Precision RS485 Quad Receivers
Low Power RS485 Quad Receivers
50Mbps, 18ns Propagation Delay, SO-16 Package
10Mbps, 10kV ESD, One-Half DE Pins, SO(W)-16 or DIP-16 Package
LTC488/LTC489
Fault Protected 3V to 5.5V RS485 Transceivers
LTC2862
LTC2863
LTC2864
LTC2865
60V Fault Protected RS485 Transceiver Half Duplex, 20Mbps or 250kbps, 25kV Common Mode Range, 15kV, Enable Pins,
SO-8 or 3mm × 3mm DFN-8 Package
60V Fault Protected RS485 Transceiver Full Duplex, 20Mbps or 250kbps, 25kV Common Mode Range, 15kV,
SO-8 or 3mm × 3mm DFN-8 Package
60V Fault Protected RS485 Transceiver Full Duplex, 20Mbps or 250kbps, 25kV Common Mode Range, 15kV, Enable Pins,
SO-14 or 3mm × 3mm DFN-10 Package
60V Fault Protected RS485 Transceiver Full Duplex, Selectable 20Mbps or 250kbps, 25kV Common Mode Range, 15kV,
Enable Pins, Logic Supply, MSOP-12 or 4mm × 3mm DFN-12
Isolated RS485 Transceivers
LTM2881
Complete Isolated RS485 µModule®
Transceiver + Power
2500V
Isolation, 3.3V or 5V Supply, No External Components, 1W DC/DC Converter,
RMS
Switchable Termination, 20Mbps, 30kV/µs Common Mode, 15kV ESD, 15mm × 11.25mm
LGA or BGA Package
LTC1535
Isolated RS485 Transceiver
5V Supply, 250kbps, 8kV ESD, SO(W)-28
486fc
LT 1112 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
14
●
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LINEAR TECHNOLOGY CORPORATION 1994
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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