LT1130A/LT1140A Series
Advanced Low Power
5V RS232 Drivers/Receivers
with Small Capacitors
U
DESCRIPTIO
FEATURES
The LT®1130A/LT1140A series of RS232 drivers/receiv-
ersfeaturesspecialbipolarconstructiontechniqueswhich
protect the drivers and receivers beyond the fault condi-
tions stipulated for RS232. Driver outputs and receiver
inputs can be shorted to ±30V without damaging the
device or the power supply generator. In addition, the
RS232I/Opinsareresilienttomultiple±10kVESDstrikes.
An advanced driver output stage operates up to 250kbaud
while driving heavy capacitive loads. Supply current is
typically 12mA, competitive with CMOS devices.
■
ESD Protection over ±10kV
(±15kV IEC-1000-4-2 for LT1133A, LT1137A
and LT1141A)
■
Uses Small Capacitors: 0.1µF, 0.2µF
■
1µA Supply Current in SHUTDOWN
■
120kBaud Operation for RL = 3k, CL = 2500pF
■
250kBaud Operation for RL = 3k, CL = 1000pF
■
CMOS Comparable Low Power
■
Easy PC Layout: Flowthrough Architecture
■
Rugged Bipolar Design: Absolutely No Latchup
■
Outputs Assume a High Impedance State When Off
Several members of the series include flexible operating
mode controls. The DRIVER DISABLE pin disables the
drivers and the charge pump, the ON/OFF pin shuts down
all circuitry. While shut down, the drivers and receivers
assume high impedance output states.
or Powered Down
■
Improved Protection: RS232 I/O Lines Can Be Forced
to ±30V Without Damage
■
Output Overvoltage Does Not Force Current Back
into Supplies
Available in SO and SSOP Packages
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
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TYPICAL APPLICATIO
Basic Operation
Output Waveforms
+
–
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
RECEIVER
OUTPUT
CL = 50pF
0.1µF
0.1µF
5V V
0.1µF
× 2
CC
3
LT1137A
0.1µF
× 2
4
DRIVER IN
RX OUT
DRIVER IN
RX OUT
RX OUT
RX OUT
DRIVER IN
RX OUT
GND
5
DRIVER OUT
RX IN
6
DRIVER
R
OUTPUT
7
DRIVER OUT
RX IN
RL = 3k
CL = 2500pF
TO LOGIC
8
TO LINE
9
RX IN
10
11
12
13
14
RX IN
DRIVER OUT
RX IN
INPUT
ON/OFF = 5V
DRIVER DISABLE
LT1130A • TA02
1130A • TA01
LT1136A 4-Driver/5-Receiver RS232 Transceiver w/Shutdown
LT1137A 3-Driver/5-Receiver RS232 Transceiver w/Shutdown
LT1138A 5-Driver/3-Receiver RS232 Transceiver w/Shutdown
LT1139A 4-Driver/4-Receiver RS232 Transceiver w/Shutdown
LT1140A5-Driver/3-ReceiverRS232Transceiverw/oChargePump
LT1141A3-Driver/5-ReceiverRS232Transceiverw/oChargePump
LT1130A 5-Driver/5-Receiver RS232 Transceiver
LT1131A 5-Driver/4-Receiver RS232 Transceiver w/Shutdown
LT1132A 5-Driver/3-Receiver RS232 Transceiver
LT1133A 3-Driver/5-Receiver RS232 Transceiver
LT1134A 4-Driver/4-Receiver RS232 Transceiver
LT1135A5-Driver/3-ReceiverRS232Transceiverw/oChargePump
1