5V RS232 Transceiver with 3V Logic Interface and One Receiver Active in Shutdown

The LT1330 is a three driver, five receiver RS232 transceiver with low supply current. Designed to interface with new 3V logic, the LT1330 operates with both a 5V power supply and a 3V logic power supply. The chip may be shut down to micropower operation with one receiver remaining active to monitor RS232 inputs such as ring detect from a modem.

The LT1330 is fully compliant with all EIA RS232 specifications. Additionally, the RS232 line input and output pins are resilient to multiple ±10kV ESD strikes. This eliminates the need for costly TransZorbs® on line pins for the RS232 part.

The LT1330 operates to 120kbaud even driving high capacitive loads. During shutdown, driver and receiver outputs are at a high impedance state allowing devices to be paralleled.

Applications

* Notebook Computers

* Palmtop Computers

* 3V Logic Interface

* ESD Protection over ±10kV

* Uses Small Capacitors: 0.1µF, 0.2µF, 1.0µF

* One Low Power Receiver Remains Active While in SHUTDOWN

* Pin Compatible with LT1137A and LT1237

* 120kBaud Operation for RL = 3k, CL = 2500pF

* 250kBaud Operation for RL = 3k, CL = 1000pF

* CMOS Comparable Low Power: 30mW

* Easy PC Layout - Flowthrough Architecture

* Rugged Bipolar Design

* Outputs Assume a High Impedance State When Off or Powered Down

* Absolutely No Latchup

* 60µA Supply Current in Shutdown

* Available in SO and SSOP Packages