5V RS232 Transceiver with One Receiver Active in SHUTDOWN

The LT1341 is an advanced low power three-driver, five-receiver RS232 transceiver. Included on the chip is a shutdown pin for reducing supply current to near zero. During shutdown one receiver remains active to detect incoming RS232 signals, for example, to wake up a system. All other receivers and the 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 LT1341 to survive multiple ±10kV strikes, eliminating the need for costly TransZorbs® on the RS232 line pins.

The LT1341 is fully compliant with all EIA RS232 specifications and operates in excess of 120kbaud even driving heavy capacitive loads.

Applications

* Notebook Computers

* Palmtop Computers

* One Receiver Remains Active While in shutdown

* ESD Protection Over ±10kV

* Uses Small Capacitors: 0.1µF, 0.2µF

* 60µA Supply Current in shutdown

* 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 Single 5V Supply

* Easy PC Layout: Flowthrough Architecture

* Rugged Bipolar Design

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

* Absolutely No Latch-Up

* Available in SSOP Package