LT1342
5V RS232 Transceiver with
3V Logic Interface
U
DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
■
■
ESD Protection Over ±10kV
3V Logic Interface
Uses Small Capacitors: 0.1µF, 0.2µF
1µA Supply Current in Shutdown
Low Power Driver Disable Operating Mode
Pin Compatible with LT1137A
120kBaud Operation for RL = 3k, CL = 2500pF
250kBaud Operation for RL = 3k, CL = 1000pF
CMOS Comparable Low Power: 60mW
Operates from a 5V Supply and 3V Logic Supply
Easy PC Layout: Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When
Off or Powered Down
Absolutely No Latchup
The LT®1342 is an advanced low power three-driver, fivereceiver RS232 transceiver. The LT1342 operates from a
5V supply and a 3V logic supply. Receiver outputs can
interface directly to 3V logic circuits. Included on the chip
is a shutdown pin for reducing supply current to near zero.
All receivers and drivers assume high impedance states
during shutdown.
The driver disable function provides additional control of
operating mode. When driver disable is high the charge
pump and drivers turn off. Receivers continue to operate
during driver disable.
New ESD structures on the chip allow the LT1342 to
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins.
The LT1342 is fully compliant with all EIA RS232 specifications and operates in excess of 120kbaud even driving
heavy capacitive loads.
UO
APPLICATI
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■
S
Notebook Computers
Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI.
UO
TYPICAL APPLICATI
Output Waveforms
V+
0.1µF
5V VCC
2 × 0.1µF
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
TO LINE
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
3V VL
1
28 V –
2
27
3
LT1342
0.1µF
2 × 0.1µF
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
RECEIVER
OUTPUT
VL = 3V
CL = 50pF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
TO 3V LOGIC
DRIVER
ROUTPUT
RL = 3k
CL = 2500pF
RX4 OUT
DRIVER 3 IN
RX5 OUT
INPUT
GND
DRIVER DISABLE
LT1342 • TA02
NC
LT1342 • TA01
1
LT1342
U
U
RATI GS
W
W W
W
AXI U
U
ABSOLUTE
PACKAGE/ORDER I FOR ATIO
(Note 1)
Supply Voltage (VCC) ................................................ 6V
Supply Voltage (VL) .................................................. 6V
V + ........................................................................ 13.2V
V – ...................................................................... –13.2V
Input Voltage
Driver ........................................................... V – to V +
Receiver ................................................ – 30V to 30V
Output Voltage
Driver .................................................... – 30V to 30V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
V + ................................................................... 30 sec
V – ................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
TOP VIEW
V+
1
28
V–
5V VCC 2
27 C2 –
C1+
3
26 C2+
C1–
4
25 DRIVER 1 IN
DRIVER 1 OUT 5
24 RX1 OUT
RX1 IN 6
23 DRIVER 2 IN
DRIVER 2 OUT 7
22 RX2 OUT
RX2 IN 8
21 RX3 OUT
RX3 IN 9
20 RX4 OUT
RX4 IN 10
19 DRIVER 3 IN
DRIVER 3 OUT 11
18 RX5 OUT
RX5 IN 12
17 GND
16 DRIVER
DISABLE
15 NC
ON/OFF 13
3V VL 14
LT1342CG
LT1342CNW
LT1342CSW
G PACKAGE
NW PACKAGE
28-LEAD PLASTIC SSOP 28-LEAD WIDE PDIP
SW PACKAGE
28-LEAD WIDE PLASTIC SO
TJMAX = 125°C, θJA = 96°C/ W (G)
TJMAX = 125°C, θJA = 56°C/ W (NW)
TJMAX = 125°C, θJA = 85°C/ W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER
Power Supply Generator
V + Output
V – Output
Supply Current (VCC)
Logic Supply Current (VL)
Supply Current When OFF (VCC)
Logic Supply Current (VL) When OFF
Supply Rise Time
Shutdown to Turn-On
ON/OFF Pin Thresholds
ON/OFF Pin Current
DRIVER DISABLE Pin Thresholds
DRIVER DISABLE Pin Current
Oscillator Frequency
2
(Note 2)
CONDITIONS
(Note 3)
(Note 4)
Shutdown (Note 5)
Driver Disable
Shutdown (Note 5)
Driver Disable
C1 = C2 = 0.2µF,
C + = C – = 0.1µF
Input Low Level (Device Shutdown)
Input High Level (Device Enabled)
0V ≤ VON/OFF ≤ 5V
Input Low Level (Drivers Enabled)
Input High Level (Drivers Disabled)
0V ≤ VDRIVER DISABLE ≤ 5V
MIN
8.6
–7
12
0.1
1
3
1
0.1
0.2
●
●
●
●
●
●
●
●
TYP
2.4
–15
2.4
–10
1.4
1.4
1.4
1.4
MAX
17
1
10
10
1
0.8
80
0.8
500
130
UNITS
V
V
mA
mA
µA
mA
µA
mA
ms
V
V
µA
V
V
µA
kHz
LT1342
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
Any Driver
Output Voltage Swing
Load = 3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Data Rate (Note 8)
Slew Rate
Propagation Delay
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Leakage Current
Receivers 1 Through 4
Output Voltage
Output Short-Circuit Current
Propagation Delay
Receiver 5
Output Voltage
Output Short-Circuit Current
Propagation Delay
(Note 2)
Positive
Negative
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
0.8V ≤ VIN ≤ 2V
VOUT = 0V
Shutdown, VOUT = ±30V (Note 5)
RL = 3k, CL = 2500pF
RL = 3k, CL = 1000pF
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
Output Transition tHL High to Low (Note 6)
Output Transition tLH Low to High
●
●
●
●
TYP
5
7.3
– 6.5
1.4
1.4
5
17
10
2
●
±9
●
MAX
4
0.8
●
Shutdown (Note 4) 0 ≤ VOUT ≤ VCC
●
Output Low, IOUT = – 1.6mA
Output High, IOUT = 160µA
Sinking Current, VOUT = VCC
Sourcing Current, VOUT = 0V
Output Transition tHL High to Low (Note 7)
Output Transition tLH Low to High
●
●
Output Low, IOUT = – 500µA
Output High, IOUT = 160µA
Sinking Current, VOUT = VCC
Sourcing Current, VOUT = 0V
Output Transition tHL High to Low (Note 7)
Output Transition tLH Low to High
●
●
0.1
3
2.7
10
2.7
2
UNITS
15
6
0.6
0.5
1.3
1.3
V
V
V
V
µA
mA
µA
kBaud
kBaud
V/µs
V/µs
µs
µs
1.3
1.7
0.4
5
1
2.4
1
7
10
V
V
V
kΩ
µA
–5
0.8
20
100
120
250
Input Low Threshold (VOUT = High)
Input High Threshold (VOUT = Low)
The ● denotes specifications which apply over the full operating
temperature range (0°C ≤ TA ≤ 70°C for commercial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Testing done at VCC = 5V, VL = 3.3V and VON/OFF = 3V.
Note 3: Supply current is measured with external capacitors C + = C –
= 0.1µF, C1 = C2 = 0.2µF. All outputs are open with all driver inputs
tied high.
Note 4: VL supply current is measured with all receiver outputs high.
Note 5: Supply current and leakage measurements in shutdown are
performed with VON/OFF ≤ 0.1V. Supply current measurements using driver
disable are performed with VDRIVER DISABLE ≥ 3V.
MIN
0.2
2.9
– 20
20
250
350
0.2
2.9
–4
4
1
1
30
0.4
–10
600
600
0.4
–2
3
3
V
V
mA
mA
ns
ns
V
V
mA
mA
µs
µs
Note 6: For driver delay measurements, RL = 3k and CL = 51pF. Trigger
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t HL = 1.4V to 0V and tLH = 1.4V to 0V).
Note 7: For receiver delay measurements, CL = 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
to standard TTL/CMOS logic threshold (t HL = 1.3V to 2.4V and tLH = 1.7V
to 0.8V).
Note 8: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
3
LT1342
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
6
OUTPUT HIGH
2.75
VCC = 5.5V
VCC = 5V
VCC = 4.5V
4
2
0
VCC = 4.5V
VCC = 5V
VCC = 5.5V
–2
–4
–6
–8
–10
–55 –25
2.50
2.25
2.00
INPUT HIGH
1.75
1.50
INPUT LOW
1.25
1.00
50
25
0
75
TEMPERATURE (°C)
100
0.50
–55 –25
125
50
25
0
75
TEMPERATURE (°C)
LT1342 • TPC01
40
30
20
100
0
125
0
3.0
125
4
2.5
50
THRESHOLD VOLTAGE (V)
150
75
3
2
1
25
0
–55 –25
50
25
75
0
TEMPERATURE (°C)
100
0
–55 –25
125
50
25
0
75
TEMPERATURE (°C)
1.0
0
–55 –25
125
50
25
75
0
TEMPERATURE (°C)
100
125
LT1342 • TPC06
Driver Leakage in Shutdown
100
35
SUPPLY CURRENT (mA)
ON THRESHOLD
1.5
1.0
OFF THRESHOLD
0.5
30
3DRIVERS LOADED R L = 3k
25
2DRIVERS LOADED R L = 3k
20
1DRIVER LOADED R L = 3k
15
NO LOAD
10
10
1
VOUT = 30V
VOUT = –30V
5
50
25
75
0
TEMPERATURE (°C)
100
125
LT1342 • TPC07
4
100
40
2.5
0
–55 –25
1.5
Supply Current
ON/OFF Thresholds
150
2.0
LT1342 • TPC05
3.0
125
0.5
LT1342 • TPC04
2.0
75
50
100
DATA RATE (kBAUD)
Driver Disable Threshold
Supply Current in Driver Disable
100
25
LT1342 • TPC03
5
SUPPLY CURRENT (mA)
SUPPLY CURRENT (µA)
50
LT1342 • TPC02
Supply Current in Shutdown
THRESHOLD VOLTAGE (V)
60
10
0.75
OUTPUT LOW
3DRIVERS ACTIVE
RL = 3k
CL = 2500pF
70
SUPPLY CURRENT (mA)
RL = 3k
Supply Current vs Data Rate
80
LEAKAGE CURRENT ( µA)
DRIVER OUTPUT VOLTAGE (V)
8
Receiver Input Thresholds
3.00
THRESHOLD VOLTAGE (V)
10
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1341 • TPC08
0.1
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1342 • TPC09
LT1342
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Short-Circuit Current
Receiver Short-Circuit Current
50
25
SHORT-CIRCUIT CURRENT (mA)
SHORT-CIRCUIT CURRENT (mA)
30
ISC+
20
15
ISC–
10
5
0
–55 –25
50
25
75
0
TEMPERATURE (°C)
100
125
40
RX1 TO RX4
ISC–
30
RX1 TO RX4
ISC+
20
RX5 ISC–
10
RX5 ISC+
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1342 • TPC11
LT1342 • TPC10
Driver Output Waveforms
Receiver Output Waveforms
RX5 OUTPUT
CL = 50pF
DRIVER OUTPUT
RL = 3k
RX1 TO RX4
OUTPUT
CL = 50pF
DRIVER OUTPUT
RL = 3k
CL = 2500pF
INPUT
INPUT
VL = 3V
LT1342 • TPC12
LT1342 • TPC13
U
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PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
VL: 3V Logic Supply Pin. Provides power to the receiver
outputs. Decouple with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: A TTL/CMOS Compatible Operating Mode Control. A logic low puts the device in the low power shutdown
mode. Drivers and receivers assume a high impedance
state in shutdown. The transceiver consumes almost no
supply current while in shutdown. A logic high fully
enables the transceiver. An ON/OFF logic low signal supersedes the state of the DRIVER DISABLE pin.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
this pin shuts down the charge pump and places all drivers
in a high impedance state. All five receivers remain active
under these conditions. Floating the DRIVER DISABLE pin
or driving it to a logic low level fully enables the transceiver. A logic low on the ON/OFF pin supersedes the state
of the DRIVER DISABLE pin. Supply current drops to 3mA
when in driver disable mode.
V +: Positive Supply Output (RS232 Drivers). V + ≈ 2VCC –
1.5V. This pin requires an external charge storage capacitor C ≥ 0.1µF, tied to ground or VCC. With multiple
transceivers, the V + and V – pins may be paralleled into
common charge storage capacitors. Larger value capacitors may be used to reduce supply ripple.
5
LT1342
U
U
U
PI FU CTIO S
V –: Negative Supply Output (RS232 Drivers). V – ≈
–(2VCC – 2.5V). This pin requires an external charge
storage capacitor C ≥ 0.1µF. To reduce supply ripple,
increase the size of the storage capacitor.
C1+, C1–, C2+, C2 –: Commutating Capacitor Inputs. These
pins require two external capacitors C ≥ 0.2µF: one from
C1+ to C1–, and another from C2 + to C2 –. The capacitor’s
effective series resistance should be less than 2Ω. For
C ≥ 1µF, low ESR tantalum capacitors work well in this
application, although small value ceramic capacitors may
be used with a minimal reduction in charge pump compliance. For operation with an external 12V supply, omit C1
and connect the 12V supply to pin C1+. Pin V + may also be
shorted to C1+ when a separate supply is used. The 12V
supply must be bypassed with a 0.1F capacitor.
DRIVER IN: RS232 Driver Input Pins. These inputs are
compatible with TTL or CMOS logic. Tie unused inputs to
VCC or VL.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Driver output swing meets RS232 levels for loads up to
3k. Slew rates are controlled for lightly loaded lines.
Output current capability is sufficient for load conditions up to 2500pF. Outputs are in a high impedance
state when in shutdown mode, VCC = 0V, or when the
DRIVER DISABLE pin is active. Outputs are fully shortcircuit protected from V – + 30V to V + – 30V. Applying
higher voltages will not damage the device if the overdrive is moderately current limited. Short circuits on
one output can load the power supply generator and
may disrupt the signal levels of the other outputs. The
driver outputs are protected against ESD to ±10V for
human body model discharges.
RX IN: Receiver Inputs. These pins accept RS232 level
signals (±30V) into a protected 5k terminating resistor.
The receiver inputs are protected against ESD to ±10kV for
human body model discharges. Each receiver provides
0.4V of hysteresis for noise immunity. Open receiver
inputs assume a logic low state.
RX OUT: Receiver Outputs with 3.3V Logic Compatible
Voltage Levels. Outputs are in a high impedance state
when in shutdown mode to allow data line sharing.
Outputs are fully short-circuit protected to ground or VCC
or VL with the power on, off, or in shutdown mode.
Receiver output level is determined by VL supply voltage.
Use VL = 3.3V for interfacing with 3.3V logic, VL = 5V for
interfacing with 5V logic.
U
ESD PROTECTIO
The RS232 line inputs of the LT1342 have on-chip protection from ESD transients up to ±10kV. The protection
structures act to divert the static discharge safely to
system ground. In order for the ESD protection to function
effectively, the power supply and ground pins of the
LT1342 must be connected to ground through low impedances. The power supply decoupling capacitors and charge
pump storage capacitors provide this low impedance in
normal application of the circuit. The only constraint is that
low ESR capacitors must be used for bypassing and
charge storage. ESD testing must be done with pins VCC,
V +, V – and GND shorted to ground or connected with low
ESR capacitors.
ESD Test Circuit
V+
5V VCC
0.1µF
2
LT1342
3
26
0.2µF
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
ON/OFF
14
3V VL
16
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
V–
27
0.1µF
DRIVER 1 OUT
RS232
LINE PINS
PROTECTED
TO ±10kV
28
1
15
0.1µF
0.2µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
DRIVER DISABLE
NC
LT1342 • ESD TC
0.1µF
6
LT1342
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.397 – 0.407*
(10.07 – 10.33)
0.205 – 0.212**
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8°
0.0256
(0.65)
BSC 0.010 – 0.015
(0.25 – 0.38)
0.005 – 0.009 0.022 – 0.037
(0.13 – 0.22) (0.55 – 0.95)
0.301 – 0.311
(7.65 – 7.90)
0.002 – 0.008
(0.05 – 0.21)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1 2 3 4 5 6 7 8 9 10 11 12 13 14
G28 SSOP 0694
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
0.150 ± 0.005
(3.810 ± 0.127)
0.600 – 0.625
(15.240 – 15.875)
0.070
(1.778)
TYP
0.045 – 0.065
(1.143 – 1.651)
1.455*
(36.957)
MAX
28
27
26
25
24
23
22
21
20
19
18
17
16
1
2
3
4
5
6
7
8
9
10
11
12
13
0.015
(0.381)
MIN
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.625 –0.015
15.87
+0.889
–0.381
)
15
0.505 – 0.560*
(12.827 – 14.224)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.035 – 0.080
(0.889 – 2.032)
0.100 ± 0.010
(2.540 ± 0.254)
14
N28 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
SW Package
28-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.291 – 0.299**
(7.391 – 7.595)
0.010 – 0.029 × 45° 0.093 – 0.104
(2.362 – 2.642)
(0.254 – 0.737)
0.037 – 0.045
(0.940 – 1.143)
0.697 – 0.712*
(17.70 – 18.08)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP 0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
1. 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
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.004 – 0.012
(0.102 – 0.305)
1
2
3
4
5
6
7
8
9 10 11 12 13 14
S28 (WIDE) 0996
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LT1342
U
TYPICAL APPLICATIO S
Operation Using 5V and 12V Power Supplies
5V VCC
12V V +
0.1µF
0.1µF
V+
VCC
1
C1+
3
26
C1–
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
TO
LINE
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/0FF = 5V
3V VL
28
2
LT1342
V–
27
0.1µF
2 × 0.1µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
TO LOGIC
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
DRIVER DISABLE
NC
0.1µF
LT1342 • TA03
Typical Mouse Driving Application
V+
0.1µF
5V VCC
MOUSE
2 × 0.1µF
(1)
OPTICS
(5)
(9)
LT1342
27
3
26
25 DRIVER 1 IN
5
24
DCD
RX1 IN
6
RX1 OUT
23 DRIVER 2 IN
DSR
DRIVER 2 OUT
7
22
RX
RX2 IN
8
RX2 OUT
21 RX3 OUT
RTS
RX3 IN
9
20
RX4 IN 10
RX4 OUT
19 DRIVER 3 IN
CTS
DRIVER 3 OUT 11
18
DTR
RX5 IN 12
17
13
16
14
15
RI
ON/OFF
3V VL
0.1µF
2 × 0.1µF
4
TX
V–
2
DRIVER 1 OUT
V+
LOGIC
28 V –
1
LOGIC “0”
LOGIC “0”
MOUSE DATA
LOGIC “1”
RX5 OUT
GND
DRIVER DISABLE
NC
DB9
LT1342 • TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1137A
3-DR/5-RX RS232 Transceiver
±15kV IEC-1000-4-2 ESD Protection
LTC1327
3-DR/5-RX RS562 Transceiver
3.3V Operation
LT1330
3-DR/5-RX RS232
3V Logic Interface
LT1331
3-DR/5-RX RS232/RS562 Transceiver
5V RS232 or 3V RS562 Operation
LTC1347
3-DR/5-RX Micropower RS232 Transceiver
5 Receivers Active in Shutdown
LTC1348
3-DR/5-RX RS232 Transceiver
True RS232 from 3V
8
Linear Technology Corporation
1342fa LT/TP 1098 REV A 2K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1993
工商网监
湘ICP备2023018690号
