LT1332

Obsolete

Wide Supply Range Low Power RS232 Transceiver with 12V VPP Output for Flash Memory

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Overview

Obsolete - Datasheet For Information Purposes Only. Contact Analog Devices For Replacement
Generates Full RS232 Signal Levels from 3V Supply
12V V_PP Output Available for Flash Memory
Useful with a Wide Variety of Switching Regulators
Low Supply Current: I(V_CC) = 1mA
Wide Supply Range: 2V ≤ V_CC ≤ 6V
ESD Protection Over ±10kV

Operates to 120k Baud
Outputs Assume a High Impedance State When Off or Powered Down
One μPower Receiver Remains Active While in SHUTDOWN
Flowthrough Architecture Eases PC Board Layout
40μA Supply Current in SHUTDOWN
Absolutely No Latch-Up
Available in SO and SSOP Packages

The LT1332 is a 3-driver/5-receiver RS232 transceiver, designed to be used in conjunction with a switching regulator. The LT1332 shares the regulator’s positive output, while charge is capacitively pumped from the regulator’s switch pin to the negative supply. Schottky rectifiers built into the LT1332 simplify the charge pump design.

The LT1332/LT1109A combination shown below generates fully compliant RS232 signal levels from as little as 2V of input supply. The switcher can deliver greater than 100mA of output current, making the LT1332 an excellent choice for mouse driver circuits.

Advanced driver output stages operate up to 120k baud while driving heavy capacitive loads. New ESD structures on chip make the LT1332 resilient to multiple ±10kV strikes, eliminating costly transient suppressors.

A shutdown pin disables the transceiver except for one receiver which remains active for detecting incoming RS232 signals. When shut down, the disabled drivers and receivers assume high impedance output states.

Applications