LT1331 Datasheet | Linear Technology

LT1331 3V RS562 or 5V/3V RS232 Transceiver with One Receiver Active in Shutdown Features s s s s s s DESCRIPTIO s s s s s s s RS232 patible 3V Operation 3V Logic Interface ESD Protection Over ±10k V 120kbaud Operation for RL = 3k, CL = 2500p F 250kbaud Operation for RL = 3k, CL = 1000p F One Low Power Receiver Remains Active While in Shutdown 60µA Supply Current in Shutdown Low Power Driver Disable Mode Uses Small Capacitors: 0.1µF, 0.2µF CMOS parable Low Power: 60m W Easy PC Layout: Flowthrough Architecture Rugged Bipolar Design Outputs Assume a High Impedance State When Off or Powered Down The LT ®1331 is a 3-driver, 5-receiver RS232 transceiver designed for 3V and mixed 3V/5V systems. Receivers operate from 3V logic supply V L, while the onboard charge pump and drivers operate from 5V or 3V supply V CC. The transceiver has two shutdown modes. One mode disables the drivers and the charge pump, the other shuts down all circuitry except for one low power receiver which can be used for ring detection. The VCC supply may be shut down while in ring detection mode. While shut down, the drivers and receivers assume high impedance output states. The LT1331 is fully pliant with all EIA-RS232 specifications when VCC = 5V. If VCC = 3V, output drive levels are patible with all known interface circuits. Special bipolar construction techniques protect the drivers and receivers beyond the fault conditions stipulated for RS232. The RS232 I/O pins are resilient to multiple ±10k V ESD strikes. An advanced driver output stage operates up to 120kbaud while driving heavy capacitive loads. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATI s s Notebook puters Palmtop puters TYPICAL APPLICATI + 0.1µF 2 × 0.1µF V+ 1 2 3 4 DRIVER 1 OUT RX1 IN DRIVER 2 OUT TO LINE RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN (LOW-Q) ON/OFF 3.3V VL 5 6 7 8 9 10 11 12 13 14 LT1331 VCC = 3.3V 3.3V Operation 28 V - 27 25 24 23 22 21 20 19 26 DRIVER 1 IN RX1...