LT1180A/LT1181A Low Power 5V RS232 Dual Driver/Receiver with 0.1m F Capacitors FEATURES DESCRIPTIO n ESD Protection over 10kV The LT 1180A/LT1181A are dual RS232 driver/receiver n Uses Small Capacitors: 0.1m F pairs with integral charge pump to generate RS232 volt- n 120kBaud Operation for R = 3k, C = 2500pF age levels from a single 5V supply. These circuits feature L L n 250kBaud Operation for R = 3k, C = 1000pF rugged bipolar design to provide operating fault tolerance L L n Outputs Withstand 30V Without Damage and ESD protection unmatched by competing CMOS n CMOS Comparable Low Power: 40mW designs. Using only 0.1m F external capacitors, these cir- n Operates from a Single 5V Supply cuits consume only 40mW of power, and can operate to n Rugged Bipolar Design 120k baud even while driving heavy capacitive loads. New n Outputs Assume a High Impedance State When Off ESD structures on the chip allow the LT1180A/LT1181A to or Powered Down survive multiple 10kV strikes, eliminating the need for n Meets All RS232 Specifications costly TransZorbs on the RS232 line pins. The LT1180A/ n Available With or Without Shutdown LT1181A are fully compliant with EIA RS232 standards. n Absolutely No Latch-up Driver outputs are protected from overload, and can be n Available in SO Package shorted to ground or up to 30V without damage. During U shutdown or power-off conditions, driver and receiver APPLICATIO S outputs are in a high impedance state, allowing line sharing. n Portable Computers n Battery-Powered Systems The LT1181A is available in 16-pin DIP and SO packages. n Power Supply Generator The LT1180A is supplied in 18-pin DIP and SO packages n Terminals for applications which require shutdown. n Modems , LTC and LT are registered trademarks of Linear Technology Corporation. TransZorb is a registered trademark of General Instruments, GSI TYPICAL APPLICATIO 2 17 Output Waveforms 5V INPUT + 0.1F 4 3 + V OUT + 0.1F LT1180A DRIVER OUTPUT 5 7 R = 3k V OUT L + C = 2500pF L 0.1F 0.1F + 6 12 15 RS232 OUTPUT RECEIVER LOGIC OUTPUT R INPUTS C = 50pF 11 8 L RS232 OUTPUT 13 14 RS232 INPUT INPUT 5k LOGIC OUTPUTS 10 9 RS232 INPUT LT1180A TA02 5k 18 16 ON/OFF LT1180A TA01 11801afb 1 U ULT1180A/LT1181A ABSOLUTEXAI U RATI GS (Note 1) Short-Circuit Duration Supply Voltage (V ) ................................................ 6V CC + + V ................................................................... 30 sec V ........................................................................ 13.2V V ................................................................... 30 sec V ...................................................................... 13.2V Driver Output .............................................. Indefinite Input Voltage + Receiver Output .......................................... Indefinite Driver ........................................................... V to V Operating Temperature Range Receiver ............................................... 30V to 30V LT1180AI/LT1181AI .......................... 40 C to 85 C ON/OFF ................................................. 0.3V to 12V LT1180AC/LT1181AC ............................. 0 C to 70 C Output Voltage + Storage Temperature Range ................ 65 C to 150 C Driver ...................................... V 30V to V + 30V Lead Temperature (Soldering, 10 sec)................. 300 C Receiver .................................... 0.3V to V + 0.3V CC PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART TOP VIEW ORDER PART NC 1 18 ON/OFF NUMBER NUMBER + C1 1 16 V CC + C1 2 17 V CC + V 2 15 GND + V 3 16 GND C1 3 14 TR1 OUT LT1180ACN LT1181ACN C1 4 15 TR1 OUT + C2 4 13 REC1 IN + LT1180ACSW LT1181ACSW C2 5 14 REC1 IN C2 5 12 REC1 OUT LT1180AIN LT1181AIN C2 6 13 REC1 OUT V 6 11 TR1 IN LT1180AISW LT1181AISW V 7 12 TR1 IN TR2 OUT 7 10 TR2 IN TR2 OUT 8 11 TR2 IN REC2 IN 8 9 REC2 OUT REC2 IN 9 10 REC2 OUT N PACKAGE SW PACKAGE N PACKAGE SW PACKAGE 16-LEAD PDIP 16-LEAD PLASTIC SO (WIDE) 18-LEAD PDIP 18-LEAD PLASTIC SO (WIDE) T = 125 C, q = 90 C/ W, q = 46 C/W (N) JMAX JA JC T = 125 C, q = 80 C/ W, q = 36 C/W (N) JMAX JA JC T = 125 C, q = 95 C/ W, q = 27 C/W (SW) JMAX JA JC = 125 C, q = 90 C/ W, q = 26 C/W (SW) T JMAX JA JC J PACKAGE J PACKAGE 18-LEAD CERDIP 16-LEAD CERDIP LT1180AMJ LT1181AMJ T = 150 C, q = 100 C/W, q = 40 C/W (J) T = 150 C, q = 100 C/W, q = 40 C/W (J) JMAX JA JC JMAX JA JC OBSOLETE PACKAGE OBSOLETE PACKAGE Consider N Package for Alternate Source Consider N Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the operating temperature range (0 C T 70 C for commercial grade, and 40 C T 85 C for industrial grade. (Note 2) A A PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply Generator + V Output 7.9 V V Output 7.0 V Supply Current (V ) (Note 3), T = 25 C913mA CC A l 16 mA Supply Current When OFF (V ) Shutdown (Note 4) LT1180A Only l 110 m A CC Supply Rise Time C1 = C2 = C3 = C4 = 0.1m F 0.2 ms Shutdown to Turn-On LT1180A Only 0.2 ms ON/OFF Pin Thresholds Input Low Level (Device Shutdown) l 0.8 1.2 V Input High Level (Device Enabled) l 1.6 2.4 V 11801afb 2 U WU U W W W