LTC2804CDHC-TRPBF [Linear]
1.8V to 5.5V RS-232 Single and Dual Transceivers; 1.8V至5.5V的RS - 232单通道和双通道收发器型号: | LTC2804CDHC-TRPBF |
厂家: | Linear |
描述: | 1.8V to 5.5V RS-232 Single and Dual Transceivers |
文件: | 总16页 (文件大小:386K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC2801/LTC2802/
LTC2803/LTC2804
1.8V to 5.5V RS-232
Single and Dual Transceivers
FEATURES
DESCRIPTION
The LTC®2801/LTC2802/LTC2803/LTC2804 are single and
dual RS-232 transceivers in narrow SSOP and chip-scale
DFN packages. All operate over a supply range of 1.8V to
5.5V, which permits operation directly from two alkaline,
NiCd or NiMH cells. An integrated DC-to-DC converter
generates power supplies for driving RS-232 levels. A
logicsupplypinallowseasyinterfacingwithdifferentlogic
levels independent of the DC-DC supply.
n
1.8V to 5.5V Supply Voltage
n
Single and Dual Transceivers
n
High-Speed Operation
1Mbps for 250pF/3kΩ Load (LTC2802, LTC2804)
250kbps for 1nF/3kΩ Load
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
n
Low-Power 1μA Shutdown and 15μA Receivers-
Active Modes
n
No Damage or Latch-Up to 10kV ESD on RS-232
These parts are compatible with the TIA/EIA-232-F stan-
dard. Driver outputs are protected from overload and can
be shorted to ground or up to 15V without damage. To
extend battery life, receivers can be kept active, operating
at reduced speed, with only 15μA current. In shutdown
mode, current is further reduced to 1μA. Line sharing and
half-duplex operation are also supported.
Interface
n
Logic Supply Pin for Easy Level-Shifting to UART or
Microprocessor
n
Low-Latency Output Enable Allows Line Sharing and
Half-Duplex Operation
n
True RS-232 Compliant Output Levels
n
Small Footprint:
LTC2801/LTC2802 4mm × 3mm DFN Package
LTC2803/LTC2804 Narrow SSOP-16 and
5mm × 3mm DFN Packages
PRODUCT SELECTION GUIDE
PART NUMBER
DRIVERS
RECEIVERS
PACKAGE
LTC2801
1
1
2
2
2
2
1
1
2
2
2
2
12-Lead DFN
APPLICATIONS
LTC2802
12-Lead DFN
LTC2803
16-Lead DFN
n
Battery-Powered Systems
LTC2803-1
LTC2804
16-Lead Narrow SSOP
16-Lead DFN
n
Computers and Consumer Electronics
n
Diagnostic Ports
LTC2804-1
16-Lead Narrow SSOP
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.8V TO 5.5V
L1
LTC2802 at 1.8V and 1Mbps
10μH
C4
1μF
V
V
SW
CAP
CC
L
TIN
2V/DIV
5V/DIV
C1
LTC2802
220nF
PS
OFF ON
MODE
TIN
TOUT
ROUT
TOUT
RIN
ROUT
GND
2V/DIV
V
EE
V
2801 TA01b
DD
V
CC
= V = 1.8V 400ns/DIV
L
WRAPPING DATA
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
C2
1μF
C3
1μF
2801 TA01a
2801234fc
1
LTC2801/LTC2802/
LTC2803/LTC2804
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supplies
PS, ON/OFF.....................................–0.3V to (V + 0.3V)
L
V ...........................................................–0.3V to 7V
RIN, R1IN, R2IN..........................................–25V to 25V
TOUT, T1OUT, T2OUT .................................–15V to 15V
CC
V ..........................................................–0.3V to 6.7V
L
Generated Supplies
ROUT, R1OUT, R2OUT....................–0.3V to (V + 0.3V)
L
V
................................................ V –0.3V to 7.5V
Operating Temperature
DD
EE
DD
CC
V ........................................................0.3V to –7.5V
LTC280XC ................................................ 0°C to 70°C
LTC280XI .............................................–40°C to 85°C
Storage Temperature Range...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
V
– V ..............................................................14V
EE
SW..................................................–0.3V to V + 0.3V
DD
EE
CAP.................................................. +0.3V to V – 0.3V
TIN, T1IN, T2IN, MODE................................–0.3V to 7V
GN Package ...................................................... 300°C
PIN CONFIGURATION
1-Driver/1-Receiver
2-Driver/2-Receiver
2-Driver/2-Receiver
TOP VIEW
TOP VIEW
TOP VIEW
R1IN
R2IN
1
2
3
4
5
6
7
8
16 R1OUT
15 R2OUT
14 T1IN
R1IN
R2IN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R1OUT
R2OUT
T1IN
RIN
1
2
3
4
5
6
12 ROUT
11 TIN
TOUT
T1OUT
T2OUT
T1OUT
T2OUT
V
CC
10
9
V
L
13 T2IN
T2IN
13
17
V
CC
12 V
L
V
MODE
PS
DD
V
CC
V
L
V
11 MODE
10 PS
SW
8
DD
V
DD
ON/OFF
V
EE
SW
GND
7
CAP
SW
CAP
V
EE
GND
9
CAP
GND
V
EE
DE PACKAGE
12-LEAD (4mm s 3mm) PLASTIC DFN
= 125°C, θ = 43°C/W, θ = 4.3°C/W (4 Layer)
EXPOSED PAD (PIN 13) IS V , MUST BE SOLDERED TO PCB
DHC PACKAGE
16-LEAD (5mm s 3mm) PLASTIC DFN
= 125°C, θ = 44°C/W, θ = 4.3°C/W (4 Layer)
GN PACKAGE
16-LEAD (NARROW 0.150) PLASTIC SSOP
T
JMAX
JA JC
EE
T
JMAX
JA
JC
T
= 125°C, θ = 110°C/W, θ = 40°C/W (4 Layer)
JMAX
JA
JC
EXPOSED PAD (PIN 17) IS V , MUST BE SOLDERED TO PCB
EE
ORDER INFORMATION
LEAD FREE FINISH
LTC2801CDE#PBF
LTC2801IDE#PBF
LTC2802CDE#PBF
LTC2802IDE#PBF
LTC2803CDHC#PBF
LTC2803IDHC#PBF
LTC2804CDHC#PBF
LTC2804IDHC#PBF
LTC2803CGN-1#PBF
LTC2803IGN-1#PBF
LTC2804CGN-1#PBF
LTC2804IGN-1#PBF
TAPE AND REEL
PART MARKING*
2801
PACKAGE DESCRIPTION
TEMPERATURE RANGE
0°C to 70°C
LTC2801CDE#TRPBF
LTC2801IDE#TRPBF
LTC2802CDE#TRPBF
LTC2802IDE#TRPBF
LTC2803CDHC#TRPBF
LTC2803IDHC#TRPBF
LTC2804CDHC#TRPBF
LTC2804IDHC#TRPBF
LTC2803CGN-1#TRPBF
LTC2803IGN-1#TRPBF
LTC2804CGN-1#TRPBF
LTC2804IGN-1#TRPBF
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (Narrow 0.150) Plastic SSOP
16-Lead (Narrow 0.150) Plastic SSOP
16-Lead (Narrow 0.150) Plastic SSOP
16-Lead (Narrow 0.150) Plastic SSOP
2801
–40°C to 85°C
0°C to 70°C
2802
2802
–40°C to 85°C
0°C to 70°C
2803
2803
–40°C to 85°C
0°C to 70°C
2804
2804
–40°C to 85°C
0°C to 70°C
28031
2803I1
28041
2804I1
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
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/
2801234fc
2
LTC2801/LTC2802/
LTC2803/LTC2804
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 1.8V to 5.5V, VL = 1.8V to 5.5V, Normal Mode. Typical values are
given for VCC = VL = 3.3V and TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supplies
I
I
V
Supply Current
CC
Outputs Unloaded
CC
L
Normal Mode (Note 3)
Receivers Active Mode
Shutdown Mode
2.3
1
mA
μA
μA
l
l
10
10
1
V Supply Current
Outputs Unloaded
L
l
l
l
l
Normal Mode (LTC2801, LTC2802)
Normal Mode (LTC2803, LTC2804)
Receivers Active Mode
0.08
0.15
15
0.15
0.30
30
mA
mA
μA
Shutdown Mode
1
10
μA
Driver
l
l
V
V
V
I
Output Voltage
R = 3kΩ
Low
High
–5
5
–5.7
6.2
V
V
OLD
L
Output Voltage
R = 3kΩ
L
OHD
HYSD
Logic Input Hysteresis
Output Short Circuit Current
Power-Off Output Leakage Current
Output Leakage Current
0.6
V
l
l
l
V = V = 5.5V; V = 0V
TOUT
±±3
±70.
±70.
±ꢀ7
±.7
±.7
mA
µA
µA
OSD
POLD
OLD
L
CC
I
I
V = V = V = V = 0V; V = ±2V
TOUT
L
CC
DD
EE
Shutdown or Receivers Active or
Drivers Disabled Modes, –.3V ≤ V
≤ .3V
TOUT
Receiver
l
l
l
l
l
l
l
l
V
V
V
V
V
V
Input Thresholds
Input Thresholds
Input Thresholds
Input Hysteresis
Output Voltage
Receivers Active Mode
Normal Mode, Input Low
Normal Mode, Input High
Normal Mode
0.8
0.8
1.5
1.3
1.7
0.4
0.2
2.4
V
V
IR
ILR
2.5
.07
0.4
V
IHR
HYSR
OLR
OHR
0.1
V
Output Low, I
= 1mA (Sinking)
V
ROUT
Output Voltage
Output High, I
= –1mA (Sourcing)
V –0.4 V –0.2
L
V
ROUT
L
R
I
Input Resistance
Output Short Circuit Current
3
5
7
kΩ
mA
–15V ≤ V ≤ .3V
IN
RIN
V = 5.5V; 0V ≤ V
≤ V
L
±ꢁ3
±37
OSR
L
ROUT
Logic
l
l
Logic Input Voltage Threshold
Logic Input Current
0.4
0.67 • V
1
V
L
I
μA
IN
Power Supply Generator
V
Regulated V Output Voltage
Driver R = 3kΩ (Note 3)
DD
EE
DD
L
7
V
V
LTC2801, LTC2802: V = V
TIN
T1IN
L
L
LTC2803, LTC2804: V
= V , V
= 0V
T2IN
V
Regulated V Output Voltage
Driver R = 3kΩ (Note 3)
EE
L
–6.3
LTC2801, LTC2802: V = V
TIN
T1IN
L
L
LTC2803, LTC2804: V
= V , V
= 0V
T2IN
2801234fc
3
LTC2801/LTC2802/
LTC2803/LTC2804
SWITCHING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 1.8V to 5.5V, VL = 1.8V to 5.5V, Normal Mode. Typical values are
given for VCC = VL = 3.3V and TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Data Rate
LTC2801, LTC2803 (Note 3)
l
l
R = 3kΩ, C = 2.5nF
100
250
kbps
kbps
L
L
R = 3kΩ, C = 1nF
L
L
LTC2802, LTC2804 (Note 3)
R = 3kΩ, C = 2.5nF
l
l
l
100
250
1000
kbps
kbps
kbps
L
L
R = 3kΩ, C = 1nF
L
L
R = 3kΩ, C = 250pF
L
L
Driver
SR(D)
Driver Slew Rate
LTC2801, LTC2803 (Figure 1)
l
l
V
V
= V = 1.8V, R = 3kΩ, C = 2.5nF
4
4
V/μs
V/μs
CC
CC
L
L
L
L
L
= V = 5.5V, R = 3kΩ, C = 50pF
30
L
LTC2802, LTC2804 (Figure 1)
l
l
V
V
= V = 1.8V, R = 3kΩ, C = 2.5nF
V/μs
V/μs
CC
CC
L
L
L
L
= V = 5.5V, R = 3kΩ, C = 50pF
150
L
L
t
t
, t
Driver Propagation Delay
Driver Skew
R = 3kΩ, C = 50pF (Figure 2)
PHLD PLHD
L
L
l
l
1
2
0.5
μs
μs
LTC2801, LTC2803
0.2
LTC2802, LTC2804
ns
ns
R = 3kΩ, C = 50pF (Figure 2)
SKEWD
L
L
100
50
LTC2801, LTC2803
LTC2802, LTC2804
l
l
t
t
, t
Driver Output Enable Time
Driver Output Disable Time
0.6
2
2
μs
μs
PS = V , MODE = ↑, R = 3kΩ, C = 50pF
PZHD PZLD
L
L
L
(Figure 4)
, t
0.3
PS = V , MODE = ↓, R = 3kΩ, C = 50pF
PHZD PLZD
L
L
L
(Figure 4)
Receiver
l
t
t
t
t
, t
Receiver Propagation Delay
Receiver Skew
C = 150pF (Figure 3)
0.2
50
60
5
0.4
μs
ns
ns
μs
PHLR PLHR
L
C = 150pF (Figure 3)
L
SKEWR
l
l
, t
Receiver Rise or Fall Time
Shutdown to Receiver Output Enable
C = 150pF (Figure 3)
L
200
15
RR FR
, t
PS = MODE = ↑ or ON/OFF = ↑,
R = 1kΩ, C = 150pF (Figure 5)
PZHR PZLR
L
L
l
l
t
, t
Receiver Output Disable upon Shutdown
0.15
0.3
μs
PS = MODE = ↓ or ON/OFF = ↓,
R = 1kΩ, C = 150pF (Figure 5)
PHZR PLZR
L
L
Power Supply Generator
/V Supply Rise Time
V
(Notes 3 and 4)
0.2
2
ms
DD EE
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise specified.
Note 3: Guaranteed by other measured parameters and not tested directly.
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 4: Time from PS ↑ or ON/OFF ↑ until V ≥ 5V and V
≤ –5V.
DD
EE
2801234fc
4
LTC2801/LTC2802/
LTC2803/LTC2804
TEST CIRCUITS
TOUT
V
L
TIN
0V
R
C
t
t
TLH
TIN
L
L
THL
V
OHD
3V
–3V
3V
–3V
TOUT
V
OLD
6V
2801F02
SR(D) =
t
or t
TIN t , t ≤ 40ns
THL
TLH
r
f
Figure 1. Driver Slew Rate Measurement
TOUT
V
L
TIN
1/2 V
1/2 V
L
L
0V
R
L
C
t
t
TIN
L
PHLD
PLHD
|
V
OHD
0V
0V
TOUT
V
OLD
t
= |t
– t
2801F02
SKEWD
PHLD PLHD
TIN t , t ≤ 40ns
r
f
Figure 2. Driver Timing Measurement
ROUT
3V
RIN
1.5V
1.5V
–3V
C
t
t
PLHR
RIN
L
PHLR
V
OHR
ROUT
1/2 V
1/2 V
L
L
V
OLR
t
= |t
– t
|
2801F03
SKEWR
PHLR PLHR
RIN t , t ≤ 40ns
r
f
Figure 3. Receiver Timing Measurement
V
L
MODE
1/2 V
1/2 V
L
L
0V
V
t
t
PHZD
PZHD
0 OR V
TOUT
L
OHD
5V
V
– 0.5V
+ 0.5V
OHD
TOUT
TOUT
0V
0V
R
C
t
t
PLZD
MODE
L
L
PZLD
V
–5V
OLD
V
OLD
2801F04
MODE t , t ≤ 40ns
r
f
Figure 4. Driver Enable/Disable Times
2801234fc
5
LTC2801/LTC2802/
LTC2803/LTC2804
TEST CIRCUITS
GND
V
L
V
L
PS AND MODE
1/2 V
1/2 V
L
L
R
L
0V
t
t
PHZR
PZHR
–3V OR 3V
ROUT
V
OHR
V
– 0.5V
OHR
ROUT
ROUT
1/2 V
L
0V
C
t
t
PLZR
PS AND MODE
L
PZLR
V
V
L
1/2 V
L
V
+ 0.5V
OLR
OLR
2801F05
PS AND MODE t , t ≤ 40ns
r
f
Figure 5. Receiver Enable/Disable Times
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VCC = VL = 3.3V unless otherwise noted.
Drivers Disabled Mode Supply
Current vs Supply Voltage
LTC2803 at 1.8V and 250kbps
LTC2804 at 1.8V and 1Mbps
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= V
L
CC
T
T
= 85°C
= 25°C
= –40°C
T1IN
T1IN
A
A
2V/DIV
2V/DIV
T1OUT
T2OUT
T1OUT
T2OUT
T
A
10V/DIV
10V/DIV
R1OUT
R2OUT
R1OUT
R2OUT
2V/DIV
2V/DIV
V
= V = 1.8V
2μs/DIV
V
= V = 1.8V 400ns/DIV
1
2
3
4
5
6
CC
L
CC L
WRAPPING DATA
WRAPPING DATA
SUPPLY VOLTAGE (V)
TOUT LOAD = 1nF + RIN
ROUT LOAD = 150pF
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
2801 G01
2801 G02
2801 G03
Supply Current vs Supply Voltage
(Dual Transceiver)
Supply Current vs Load
Supply Current vs Data Rate
Capacitance (Dual Transceiver)
100
80
60
40
20
0
60
50
40
30
20
10
0
100
80
60
40
20
0
ALL DRIVERS SWITCHING
ALL DRIVERS SWITCHING
V
= V = 1.8V
CC
L
L
250kbps
125kbps
V
= V
CC
L
L
L
R
= 3k
R
= 3k
250kbps
C
= 1nF
1nF
1nF
125kbps
250pF
20.8kbps
20.8kbps
250pF
V
= V = 1.8V
L
CC
LTC2804
LTC2802
LTC2804
LTC2803
LTC2804
LTC2803
R
= 3k
L
ALL DRIVERS SWITCHING
0
200
400
600
800
1000
1
2
3
4
5
6
2
3
4
1
5
SUPPLY VOLTAGE (V)
DATA RATE (kbps)
LOAD CAPACITANCE (nF)
2801 G05
2801 G04
2801 G06
2801234fc
6
LTC2801/LTC2802/
LTC2803/LTC2804
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VCC = VL = 3.3V unless otherwise noted.
Receiver Output Voltage
vs Load Current
Receiver Input Threshold
vs Temperature
Receiver Output Duty Cycle
100
80
60
40
20
0
3.0
2.5
2.0
1.5
1.0
0.5
0
6
5
4
3
2
1
0
R
L
=
3V
V
V
V
= 5.5V
= 3.3V
= 1.8V
V
V
V
= 5.5V
= 3.3V
= 1.8V
IN
L
L
L
L
L
L
C
= 150pF
RECEIVERS
ALIVE MODE
INPUT HIGH
NORMAL
MODE
INPUT LOW
V
V
V
= 5.5V
= 3.3V
= 1.8V
L
L
L
0
1
2
3
4
5
6
7
8
10
100
1000
10000
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
LOAD CURRENT (mA)
DATA RATE (kbps)
2801 GO9
2801 GO8
2801 GO7
Driver Slew Rate
Driver Short-Circuit Current
vs Temperature
Shutdown or Drivers Disabled Mode
Driver Leakage vs Temperature
vs Load Capacitance
–6
10
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
FALLING (LTC2802/04)
RISING (LTC2802/04)
FALLING (LTC2801/03)
RISING (LTC2801/03)
–7
–8
–9
10
10
10
SINKING
V(TOUT) = 15V OR
V(TOUT) = –15V
SOURCING
–10
10
10
REGULATOR CAN
LIMIT FURTHER
–11
50
TEMPERATURE (°C)
100 125
–50
25
50
75
100 125
–50 –25
0
25
75
–25
0
1
2
4
3
0
5
TEMPERATURE (°C)
LOAD CAPACITANCE (nF)
2801 G12
2801 G11
2801 G10
Logic Input Threshold
vs VL Supply Voltage
LTC2804 Driver Outputs Exiting
Shutdown
LTC2804 Driver Outputs
Enable/Disable
3.0
2.5
2.0
1.5
1.0
0.5
0
T
T
A
= 85°C
= 25°C
= –40°C
A
A
T
2V/DIV
5V/DIV
2V/DIV
5V/DIV
MODE AND PS
MODE
INPUT HIGH
T1OUT
T2OUT
T1OUT
T2OUT
INPUT LOW
100μs/DIV
2μs/DIV
1
2
3
4
5
6
V
V
= 3.3V
V
V
= 3.3V
CC
CC
L
= 1.8V
= 1.8V
L
V
SUPPLY VOLTAGE (V)
L
LOAD = 3k + 2.5nF
LOAD = 3k + 250nF
2801 G13
2801 G14
2801 G15
2801234fc
7
LTC2801/LTC2802/
LTC2803/LTC2804
PIN FUNCTIONS
PIN NUMBER
2801
2802
2803
2804
2803-1
2804-1 COMMENTS
PIN NAME
V
CC
V
DD
3
4
5
6
5
6
Input Supply (1.8V-5.5V). Bypass to GND with a 1μF capacitor.
Generated Positive Supply Voltage for RS-232 Driver (7V). Connect a 1μF capacitor between
and GND.
V
DD
V
EE
13*
17*
9
Generated Negative Supply Voltage for RS-232 Driver (–6.3V). Connect a 1μF capacitor
between V and GND.
EE
SW
5
6
7
7
8
9
7
8
Switch Pin. Connect a 10μH inductor between SW and V
Ground.
.
CC
GND
CAP
10
Charge Pump Capacitor for Generated Negative Supply Voltage. Connect a 220nF capacitor
between CAP and SW.
V
L
10
12
12
Logic Supply (1.8V-5.5V) for the receiver outputs, driver inputs, and control inputs. This pin
should be bypassed to GND with a 220nF capacitor if it’s not tied to V
.
CC
TIN (T1IN, T2IN)
11
2
14, 13
3, 4
14, 13 Driver Input(s), referenced to V .
L
TOUT (T1OUT, T2OUT)
RIN (R1IN, R2IN)
3, 4
1, 2
RS-232 Driver Output(s).
RS-232 Receiver Input(s). Includes internal 5kΩ termination resistor(s).
1
1, 2
ROUT (R1OUT, R2OUT)
12
16, 15
16, 15 Receiver Output(s), referenced to V . Output is short-circuit protected to GND/V /V , and is
L
CC
L
high impedance in Shutdown mode, allowing data line sharing.
PS
8
9
10
11
—
—
—
11
Power Supply control pin, referenced to V . Enables the integrated DC-DC converter.
L
MODE
ON/OFF
Mode control pin, referenced to V . See Table 1 for functionality.
L
—
Transceiver enable pin, referenced to V . A logic low puts the device in Shutdown mode and
L
places both driver and receiver outputs in a high impedance state.
*Backside thermal pad
MODE CONTROL
Table 1. LTC2801-LTC2804
RECEIVER
DRIVER
MODE NAME
PS
L
MODE
OUTPUT(S)
DC-DC
OFF
OUTPUT(S)
I
*
I *
VL
VCC
SHUTDOWN
L
H
L
HI-Z
ON
HI-Z
HI-Z
HI-Z
1μA
1μA
1μA
RECEIVERS ACTIVE
DRIVERS DISABLED
L
OFF
15μA
H
ON
ON
2.1mA
80μA OR
150μA
NORMAL
H
H
ON
ON
ON
2.3mA
80μA OR
150μA
Table 2. LTC2803-1, LTC2804-1
RECEIVER
OUTPUTS
DRIVER
MODE NAME
SHUTDOWN
NORMAL
ON/OFF
DC-DC
OFF
OUTPUTS
I
*
I *
VL
VCC
L
HI-Z
ON
HI-Z
ON
1μA
2.3mA
1μA
H
ON
150μA
*Typical currents for static drivers. Normal mode currents are for unloaded outputs.
2801234fc
8
LTC2801/LTC2802/
LTC2803/LTC2804
FEATURE SUMMARY
FEATURE
2801
1 + 1
DE
l
2802
1 + 1
DE
l
2803
2 + 2
DHC
l
2803-1
2 + 2
GN
2804
2 + 2
DHC
l
2804-1
2 + 2
GN
DRIVERS and RECEIVERS
PACKAGE
l
l
1.8V - 5.5V OPERATION
l
l
l
l
l
l
1.8V - 5.5V LOGIC SUPPLY (V )
L
l
l
l
l
l
l
SHUTDOWN (1μA)
l
l
l
l
RECEIVER(S) ACTIVE (15μA)
DRIVER DISABLE
l
l
l
l
l
l
l
l
l
l
l
l
l
100kb/s for R = 3kΩ, C = 2.5nF
L
L
l
l
l
l
250kb/s for R = 3kΩ, C = 1nF
L
L
l
l
1Mb/s for R = 3kΩ, C = 250pF
L
L
BLOCK DIAGRAM
L1
10μH
C1
220nF
1.8V TO 5.5V
C4
1μF
V
SW
CAP
CC
V
V
DD
EE
V
L
1.8V TO 5.5V
BOOST
REGULATOR
C5
220nF
C3
1μF
C2
1μF
V
V
DD
L
T2IN
T1IN
T2OUT
T1OUT
**
**
**
**
V
L
GND
V
EE
R2OUT
R1OUT
R2IN
R1IN
5k
5k
V
L
PS
LTC2801
LTC2802
LTC2803
LTC2804
**
LTC2803
LTC2804
LTC2803-1
LTC2804-1
GND
GND
MODE
CONTROL
ON/OFF
LTC2803-1
LTC2804-1
2801BD
2801234fc
9
LTC2801/LTC2802/
LTC2803/LTC2804
APPLICATIONS INFORMATION
Overview
ANY VOLTAGE FROM
1.8V TO 5.5V
ANY VOLTAGE FROM
1.8V TO 5.5V
The LTC2801 family of RS-232 transceivers operates on
V
CC
a V supply of 1.8V to 5.5V, utilizing a switching regula-
CC
V
L
tor to generate the necessary higher voltage rails for the
drivers. The transceivers interface with logic operating
EXTERNAL
DEVICE
RS-232
on any supply from 1.8V to 5.5V, independent of the V
CC
voltage. Depending on the device, one or two control pins
are available to invoke Shutdown, Receiver Active and
Driver Disable features.
2801F07
Figure 7. VCC and VL Are Independent
DC-DC Converter
Power-Saving Modes
The on-chip DC-DC converter operates from the V
CC
input, generating a 7V V supply and a charge pumped
WhentheDC-DCconverteranddriversareturnedoff(PSor
DD
–6.3V V supply, as shown in Figure 6. V and V
ON/OFF=logiclow), V supplycurrentisreducedto1μA.
EE
DD
EE
CC
power the output stage of the drivers and are regulated
to levels that guarantee greater than ±5V output swing.
The DC-DC converter requires a 10μH inductor (L1) and
a bypass capacitor (C4) of at least 1μF. The recommended
size for the charge pump capacitor (C1) is 220nF and for
the storage capacitors (C2 and C3) is 1μF. Larger storage
capacitors up to 4.7μF may be used if C1 is kept at 20% to
50% their size and C4 is also scaled. Locate C1-C4 close
to their associated pins.
Tables 1 and 2 summarize the modes for each device.
In Shutdown mode, V supply current is reduced to 1μA,
L
and both receiver and driver outputs assume a high im-
pedance state.
In Receivers Active mode, the quiescent V supply current
L
is reduced to 15μA and the driver outputs assume a high
impedance state. The receivers operate at a reduced rate
(typically 100 kbps) with hysteresis turned off.
L1
10μH
C1
220nF
Half-Duplex Operation
1.8V TO 5.5V
C4
CAP
When the DC-DC converter is kept on (PS = logic high),
MODEservesasalow-latencydriverenableforhalf-duplex
operation. Each driver is enabled and disabled in less than
2μs, whileeachreceiverremainscontinuouslyactive. This
mode of operation is illustrated in Figures 15-17.
V
SW
CC
1μF
V
V
DD
EE
C2
1μF
V
L
1.8V TO 5.5V
BOOST
REGULATOR
C5*
220nF
C3
1μF
Battery Operation
2801F06
*OMIT IF V IS CONNECTED TO V
CC
L
To maximize battery life, connect V (and L1) directly to
CC
the unregulated battery voltage and V to the regulated
L
Figure 6. DC/DC Converter and Recommended Bypassing
supply, as shown in Figure 22. This configuration typically
minimizes conversion loss while providing compatibility
with system logic levels.
V Logic Supply
L
AseparatelogicsupplypinV allowstheLTC2801familyto
L
interfacewithanylogicsignalfrom1.8Vto5.5V, asshown
in Figure 7. Simply connect the desired logic supply to
V . There is no interdependency between V and V ; they
Inductor Selection
A 10μH inductor with a saturation current (I ) rating
SAT
L
CC
L
of at least 200mA and low DCR (copper wire resistance)
is recommended. Some small inductors meeting these
requirements are listed in Table 3.
may simultaneously operate at any voltage from 1.8V to
5.5Vandsequenceinanyorder.IfV ispoweredseparately
L
from V , bypass V with a 220nF capacitor (C5).
CC
L
2801234fc
10
LTC2801/LTC2802/
LTC2803/LTC2804
APPLICATIONS INFORMATION
Table 3. Recommended Inductors
flowing through inductor L1 and capacitors C1, C2. The
peak inrush current must not exceed 2A. To avoid this
condition, add a 1Ω resistor as shown in Figure 8. This
precaution is not relevant for supply voltages below 4.5V
or rise times longer than 10μs.
PART
NUMBER
I
MAX DCR
(Ω)
SIZE
(mm)
SAT
(mA)
MANUFACTURER
LQH2MCN100K02L 225
1.2
0.85
1.1
Murata
2 × 1.6 × 0.95
2 × 1.6 × 1.6
2.5 × 2 × 1.6
www.murata.com
LBC2016T100K
FSLB2520-100K
245
220
Taiyo Yuden
www.t-yuden.com
Board Layout
Toko
www.tokoam.com
The board layout should minimize the length and area of
the SW and CAP traces. Suggested compact layouts for
the LTC2801 family are shown in Figure 9 (a) and (b).
Capacitor Selection
The small size of ceramic capacitors makes them ideal for
the LTC2801 family. X5R and X7R (preferred) types are
recommendedbecausetheirESRislowandtheyretaintheir
capacitance over relatively wide voltage and temperature
ranges. Use a voltage rating of at least 10V.
C1
GND
GND
C2
V
L1
V
L
Table 4. Recommended Ceramic Capacitor Manufacturers
C5
GND
MANUFACTURER
Murata
URL
CC
GND
www.murata.com
www.tdk.com
www.t-yuden.com
www.avxcorp.com
www.kemet.com
C4
TDK
Taiyo Yuden
AVX
GND
TOP VIEW
= VIA
C3
Kemet
Inrush Current and Supply Overshoot Precaution
In certain applications, such as battery-operated and
wall-adapter devices, fast supply slew rates are generated
C1
GND
GND
when power is connected. If V ’s voltage is greater than
CC
C2
L1
4.5V and its rise time is faster than 10μs, the pins V
DD
V
L
C5
and SW can exceed their ABS MAX values during start-
up. When supply voltage is applied to V , the voltage
GND
V
CC
CC
GND
difference between V and V generates inrush current
CC
DD
C4
L1
10μH
C1
220nF
4.5V TO 5.5V
INRUSH
CURRENT
R1
SW
CAP
GND
1Ω
1/8W
V
CC
C3
C4
1μF
V
DD
GND
C2
1μF
TOP VIEW
= VIA
SCALE R1 WITH C1, C2, 1/C4
2801F08
2801F09
Figure 8. Supply Overshoot Protection for Input
Supplies of 4.5V or Higher
Figure 9. Recommended Board Layouts for (a) Single and
(b) Dual Transceiver Parts
2801234fc
11
LTC2801/LTC2802/
LTC2803/LTC2804
TYPICAL APPLICATIONS
1.8V TO 5.5V
5
V
V
CC
L
5
V
V
CC
L
LTC2804
LTC2803
12
12
11
10
13
14
15
16
1.8V TO 5.5V
CELL PHONE
10 PS
MODE
11 MODE
V
BATT
PERIPHERAL
PS
RA ON
T2IN
4
3
2
1
13
14
15
16
T2OUT
T1OUT
R2IN
T2IN
4
3
2
1
T2OUT
T1OUT
R2IN
RTS
TD
RTS
T1IN
T1IN
TD
CTS
RD
R2OUT
R1OUT
R2OUT
R1OUT
CTS
RD
R1IN
R1IN
GND
8
GND
8
2801F10
2801F11
Figure 10. Power-Saving Receivers-Active Mode
Figure 11. Cellphone Peripheral Interface
5V
3
3V
1.8V TO 5.5V
5
3
10
8
V
V
V
V
V
1.8V
5V
μP
CC
CC
CC
LTC2801
LTC2802
LTC2804-1
10
8
12
V
L
L
L
PS
PS
9
9
11
13
14
15
16
MODE
MODE
ON/OFF
OFF ON
μP
T2IN
4
3
2
1
T2OUT
T1OUT
R2IN
TIN
TOUT
2
1
TIN
TOUT
2
1
T1IN
11
12
11
12
R2OUT
R1OUT
ROUT
RIN
ROUT
RIN
R1IN
GND
6
GND
6
GND
2801F12
2801F13
2801F14
8
Figure 12. 1.8V Microprocessor Interface
Figure 13. 5V Microprocessor Interface
Figure 14. Power-Saving Shutdown Mode
1.8V TO 5.5V
1.8V TO 5.5V
1.8V TO 5.5V
5
3
3
V
CC
V
V
CC
CC
LTC2803
LTC2802
LTC2802
12
10
10
V
L
V
L
V
L
10
8
8
PS
PS
PS
11
9
9
R T
MODE
T2IN
R T
MODE
R T
3.3k
MODE
13
15
14
16
T2OUT
R2IN
4
2
3
1
3.3k
R2OUT
T1IN
TIN
TOUT
2
1
TIN
TOUT
2
1
11
12
11
12
T1OUT
R1IN
3.3k
R1OUT
ROUT
RIN
ROUT
RIN
GND
GND
GND
2801F17
2801F15
2801F16
8
6
6
Figure 15. Half-Duplex on Single Line,
Separate ROUT, TIN
Figure 16. Half-Duplex on Single Line
Figure 17. Half-Duplex Dual Transceiver
2801234fc
12
LTC2801/LTC2802/
LTC2803/LTC2804
TYPICAL APPLICATIONS
2.5V TO 5.5V
L1
10μH
5
7
9
5
7
9
V
V
SW
V
V
SW
CC
L
CC
L
C1
470nF
LTC2803
LTC2803
12
12
4
3
13
14
C4
2μF
CAP
CAP
3k
C
L
T2IN
4
3
2
1
T2IN
4
3
2
1
13
14
15
16
T2OUT
T1OUT
R2IN
13
14
15
16
T2OUT
T1OUT
R2IN
2801F18
T1IN
T1IN
DATA RATE
(kbps)
100
250
1000
R2OUT
R1OUT
R2OUT
R1OUT
C
(nF) LTC2803 LTC2804
L
5
2
X
X
X
X
X
R1IN
R1IN
0.5
GND
8
V
V
GND
8
V
V
EE
DD
EE
DD
6
17
6
17
Figure 18. Driving Larger Loads
2801F19
C2
2μF
C3
2μF
ANY COMBINATION
LTC2801/LTC2802/LTC2803/LTC2804
Figure 19. Quad Transceiver (2.5V < VCC < 5.5V)
1.8V TO 5.5V
12
C5
220nF
V
L
LTC2803
V
= 1.8V
CC
2
1
R2OUT 15
R1OUT 16
R2IN
R2IN
DRIVERS DISABLED
3V TO 25V
–25V TO 0V
V
L
0V
V
CC
= 1.8V
DRIVERS LOADED
V
SW
11
5
10
5V/DIV
MODE
OFF ON
PS
V
= 5.5V
CC
DRIVERS DISABLED
13
V
T2IN
CC
7
14
V
= 5.5V
CC
SW
T1IN
DRIVERS LOADED
GND
V
V
EE
DD
200ns/DIV
2801F21
8
6
17
Figure 21. Typical SW Pin Waveforms
2801F20
NOTES:
1. NO L1 OR C2-C4 NEEDED.
2. RECEIVERS ACTIVE MODE SHOWN HAS NO DC HYSTERESIS.
3. SEE DUTY CYCLE GRAPH IN TYPICAL PERFORMANCE SECTION.
Figure 20. 100kbps Dual Inverting Level Translator
(IL = 15μA Static)
2801234fc
13
LTC2801/LTC2802/
LTC2803/LTC2804
TYPICAL APPLICATIONS
DE/UE Package
12-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695 Rev D)
7047 ± 70.7
4077 ±70.7
(ꢁ SIDES)
R = 70..3
TYP
ꢀ
.ꢁ
70ꢀ7 ±7073
R = 7073
TYP
±0±7 ±70.7
±0±7 ±7073
.0ꢀ7 ± 7073
±067 ±7073
ꢁ0ꢁ7 ±7073
±077 ±70.7
(ꢁ SIDES)
.0ꢀ7 ± 70.7
PIN .
PIN . NOTCH
TOP MARK
(NOTE 6)
R = 70ꢁ7 OR
70±3 × 43°
CHAMFER
(UE.ꢁ/DE.ꢁ) DFN 7876 REV
D
6
.
70ꢁ3 ± 7073
70ꢀ3 ±7073
70ꢁ77 REF
70ꢁ3 ± 7073
ꢁ037 REF
7037 BSC
7037 BSC
PACKAGE OUTLINE
ꢁ037 REF
BOTTOM VIEW—EXPOSED PAD
7077 – 7073
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
NOTE:
40 DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH0 MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 70.3mm ON ANY SIDE
30 EXPOSED PAD SHALL BE SOLDER PLATED
60 SHADED AREA IS ONLY A REFERENCE FOR PIN . LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
.0 DRAWING PROPOSED TO BE A VARIATION OF VERSION
(WGED) IN JEDEC PACKAGE OUTLINE M7-ꢁꢁ9
ꢁ0 DRAWING NOT TO SCALE
±0 ALL DIMENSIONS ARE IN MILLIMETERS
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
R = 70..3
TYP
7047 ± 70.7
3077 ±70.7
(ꢁ SIDES)
9
.6
R = 70ꢁ7
TYP
7063 ±7073
±037 ±7073
±077 ±70.7 .063 ± 70.7
(ꢁ SIDES) (ꢁ SIDES)
.063 ±7073
PIN .
ꢁ0ꢁ7 ±7073 (ꢁ SIDES)
TOP MARK
(SEE NOTE 6)
PIN .
NOTCH
PACKAGE
OUTLINE
(DHC.6) DFN ..7±
8
.
70ꢁ3 ± 7073
70ꢀ3 ±7073
70ꢁ77 REF
70ꢁ3 ± 7073
7037 BSC
7037 BSC
4047 ±70.7
4047 ±7073
(ꢁ SIDES)
(ꢁ SIDES)
7077 – 7073
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
.0 DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-.) IN JEDEC
PACKAGE OUTLINE MO-ꢁꢁ9
ꢁ0 DRAWING NOT TO SCALE
±0 ALL DIMENSIONS ARE IN MILLIMETERS
40 DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH0 MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 70.3mm ON ANY SIDE
30 EXPOSED PAD SHALL BE SOLDER PLATED
60 SHADED AREA IS ONLY A REFERENCE FOR PIN . LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
2801234fc
14
LTC2801/LTC2802/
LTC2803/LTC2804
PACKAGE DESCRIPTION
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
0.89 – 0.96*
(4087. – 409ꢀ8)
0743 ±0773
0779
(70ꢁꢁ9)
REF
.6 .3 .4 .± .ꢁ .. .7 9
0ꢁ34 MIN
0.37 – 0.63
0ꢁꢁ9 – 0ꢁ44
0.37 – 0.3ꢀ**
(308.ꢀ – 60.98)
(±08.7 – ±0988)
07.63 ±077.3
07ꢁ37 BSC
RECOMMENDED SOLDER PAD LAYOUT
.
ꢁ
±
4
3
6
ꢀ
8
07.3 ± 0774
(70±8 ± 70.7)
× 43°
073±ꢁ – 07688
(.0±3 – .0ꢀ3)
0774 – 07798
(70.7ꢁ – 70ꢁ49)
077ꢀ – 07798
(70.ꢀ8 – 70ꢁ49)
7° – 8° TYP
07.6 – 0737
(70476 – .0ꢁꢀ7)
07ꢁ37
(706±3)
BSC
0778 – 07.ꢁ
GN.6 (SSOP) 7ꢁ74
(70ꢁ7± – 70±73)
TYP
NOTE:
.0 CONTROLLING DIMENSION: INCHES
INCHES
ꢁ0 DIMENSIONS ARE IN
(MILLIMETERS)
±0 DRAWING NOT TO SCALE
*DIMENSION DOES NOT INCLUDE MOLD FLASH0 MOLD FLASH
SHALL NOT EXCEED 70776" (70.3ꢁmm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH0 INTERLEAD
FLASH SHALL NOT EXCEED 707.7" (70ꢁ34mm) PER SIDE
2801234fc
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.
15
LTC2801/LTC2802/
LTC2803/LTC2804
TYPICAL APPLICATION
L1
10μH
C1
220nF
1.8V TO 5.5V
+
C4
1μF
*
–
7
9
SW
CAP
DC-DC
5
V
V
CC
1.8V TO 5.5V
12
LTC2804
L
C5
220nF
10
11
13
14
15
16
*
PS
V
CC
PP
PP
MODE
T2IN
X
4
3
2
1
T2OUT
T1OUT
R2IN
CTS
RX
UART
RTS
Y
T1IN
TXD
μP
R2OUT
R1OUT
PP
Z
R1IN
TX
RXD
GND
8
V
V
EE
DD
6
2801F22
17
C2
1μF
C3
1μF
*ADDITIONAL BYPASS CAPACITOR AS NEEDED
Figure 22. Diagnostic Port Operating Directly Off Unregulated Battery Voltage
RELATED PARTS
PART NUMBER
LT1780/LT1781
LTC1337
DESCRIPTION
COMMENTS
2-Driver/2-Receiver RS232 Transceiver Single 5V Supply with 0.1ꢀF Capacitors, 15kV ESD
3-Driver/5-Receiver RS232 Transceiver Ultralow Power for DTE Applications
5-Driver/3-Receiver RS232 Transceiver Ultralow Power for DCE Applications
LTC1338
LT1039/LT1039-16 3-Driver/3-Receiver RS232 Transceiver 30kΩ Input Impedance for Multi-Drop Applications
LTC1348
3-Driver/5-Receiver RS232 Transceiver True RS232 Levels on 3.3V Supply
2801234fc
LT 0808 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2005
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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