LT1342 Datasheet | Linear Technology

LT1342 5V RS232 Transceiver with 3V Logic Interface Features s s s s s s s s s s s s s DESCRIPTIO s ESD Protection Over ±10k V 3V Logic Interface Uses Small Capacitors: 0.1µF, 0.2µF 1µA Supply Current in Shutdown Low Power Driver Disable Operating Mode Pin patible with LT1137A 120k Baud Operation for RL = 3k, CL = 2500p F 250k Baud Operation for RL = 3k, CL = 1000p F CMOS parable Low Power: 60m W Operates from a 5V Supply and 3V Logic Supply Easy PC Layout: Flowthrough Architecture Rugged Bipolar Design Outputs Assume a High Impedance State When Off or Powered Down Absolutely No Latchup The LT®1342 is an advanced low power three-driver, fivereceiver RS232 transceiver. The LT1342 operates from a 5V supply and a 3V logic supply. Receiver outputs can interface directly to 3V logic circuits. Included on the chip is a shutdown pin for reducing supply current to near zero. All receivers and 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 LT1342 to survive multiple ±10k V strikes, eliminating the need for costly Trans Zorbs® on the RS232 line pins. The LT1342 is fully pliant with all EIA RS232 specifications and operates in excess of 120kbaud even driving heavy capacitive loads. , LTC and LT are registered trademarks of Linear Technology Corporation. Trans Zorb is a registered trademark of General Instruments, GSI. APPLICATI s s Notebook puters Palmtop puters TYPICAL APPLICATI V+ 0.1µF 2 × 0.1µF DRIVER 1 OUT RX1 IN DRIVER 2 OUT TO LINE RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF 3V VL 5V VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LT1342 28 V - 27 26 25 24 23 22 21 20 19 18 17 16 15 DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND DRIVER DISABLE NC - TA01 2 × 0.1µF 0.1µF RECEIVER...