LINEAR LT1130A, LT1140A Series Data Handbook

LT1130A/LT1140A Series Advanced Low Power 5V RS232 Drivers/Receivers with Small Capacitors FEATURES DESCRIPTIO

ESD Protection over ±10k V The LT®1130A/LT1140A series of RS232 drivers/receiv- (±15k V IEC-1000-4-2 for LT1133A, LT1137A ers features special bipolar construction techniques which and LT1141A) protect the drivers and receivers beyond the fault condi- Uses Small Capacitors: 0.1µF, 0.2µF tions stipulated for RS232. Driver outputs and receiver

1µA Supply Current in SHUTDOWN inputs can be shorted to ±30V without damaging the 120k Baud Operation for RL = 3k, CL = 2500p F device or the power supply generator. In addition, the 250k Baud Operation for RL = 3k, CL = 1000p F RS232 I/O pins are resilient to multiple ±10k V ESD strikes. CMOS Comparable Low Power An advanced driver output stage operates up to 250kbaud Easy PC Layout: Flowthrough Architecture while driving heavy capacitive loads. Supply current is Rugged Bipolar Design: Absolutely No Latchup typically 12m A, competitive with CMOS devices.

Outputs Assume a High Impedance State When Off

Several members of the series include flexible operating

or Powered Down

mode controls. The DRIVER DISABLE pin disables the

Improved Protection: RS232 I/O Lines Can Be Forced

drivers and the charge pump, the ON/OFF pin shuts down

to ±30V Without Damage

all circuitry. While shut down, the drivers and receivers

Output Overvoltage Does Not Force Current Back

assume high impedance output states.

into Supplies

, LTC and LT are registered trademarks of Linear Technology Corporation.

Available in SO and SSOP Packages

TYPICAL APPLICATIO

Basic Operation Output Waveforms

RECEIVER

5V VCC 0.1µF OUTPUT

LT1137A × 2 CL = 50p F

× 2 DRIVER IN

DRIVER OUT RX OUT

DRIVER

RX IN DRIVER IN

OUTPUT

DRIVER OUT RX OUT RL = 3k

TO LOGIC

RX IN RX OUT CL = 2500p F

TO LINE

RX IN RX OUT RX IN DRIVER IN DRIVER OUT RX OUT INPUT RX IN GND ON/OFF = 5V DRIVER DISABLE

LT1130A • TA02

1130A • TA01

LT1130A 5-Driver/5-Receiver RS232 Transceiver LT1136A 4-Driver/5-Receiver RS232 Transceiver w/Shutdown LT1131A 5-Driver/4-Receiver RS232 Transceiver w/Shutdown LT1137A 3-Driver/5-Receiver RS232 Transceiver w/Shutdown LT1132A 5-Driver/3-Receiver RS232 Transceiver LT1138A 5-Driver/3-Receiver RS232 Transceiver w/Shutdown LT1133A 3-Driver/5-Receiver RS232 Transceiver LT1139A 4-Driver/4-Receiver RS232 Transceiver w/Shutdown LT1134A 4-Driver/4-Receiver RS232 Transceiver LT1140A 5-Driver/3-Receiver RS232 Transceiver w/o Charge Pump LT1135A 5-Driver/3-Receiver RS232 Transceiver w/o Charge Pump LT1141A 3-Driver/5-Receiver RS232 Transceiver w/o Charge Pump