LT1080/LT1081 Advanced Low Power 5V RS232 Dual Driver/Receiver FEATURES DESCRIPTIO n Superior to CMOS The LT 1080/LT1081 are the only dual RS232 driver/ Improved Speed: Operates over 120kBaud receiver with charge pump to guarantee absolutely no Improved Protection: Outputs Can Be Forced latchup. These interface optimized devices provide a real- to 30V without Damage istic balance between CMOS levels of power dissipation Three-State Outputs Are High and real world requirements for ruggedness. The driver Impedance When Off outputs are fully protected against overload and can be Only Needs 1m F Capacitors shorted to 30V. Unlike CMOS, the advanced architecture n Absolutely No Latchup of the LT1080/LT1081 does not load the signal line when n CMOS Comparable Low Power: 60mW shut down or when power is off. Both the receiver and n Can Power Additional RS232 Drivers: 10mA RS232 outputs are put into a high impedance state. An n Supply Current in Shutdown: 1m A advanced output stage allows driving higher capacitive n Available in SO Package loads at higher speeds with exceptional ruggedness n Available with or without Shutdown against ESD. For applications requiring up to five drivers and five U receivers with charge pump in one package see the LT1130A APPLICATIO S Series data sheet. A version of the LT1080/LT1081, the n Portable Computers LT1180A and LT1181A that use only 0.1m F capacitors, is n Battery-Powered RS232 Systems also available. All of Linear Technologys RS232 ICs are n Power Supply Generator available in standard surface mount packages. n Terminals , LTC and LT are registered trademarks of Linear Technology Corporation. n Modems TYPICAL APPLICATIO 2 17 5V INPUT 1m F 4 3 Supply Generator Outputs 9V OUTPUT 1m F 10 + LT1080 V OUTPUT 8 5 7 R TO V L 9V OUTPUT R TO GND L 6 1m F 1m F 6 4 12 15 2 RS232 OUTPUT LOGIC 0 V = 5V CC INPUTS 11 8 2 RS232 OUTPUT 13 14 4 RS232 INPUT R TO GND L + 6 R TO V 5k L LOGIC OUTPUTS 8 10 9 V OUTPUT RS232 INPUT 10 02468 10 12 14 16 18 20 5k 18 16 OUTPUT CURRENT (mA) ON/OFF 1080/81 TA01a 1080/81 TA01 10801fe 1 OUTPUT VOLTAGE (V) U ULT1080/LT1081 ABSOLUTEXAI U RATI GS (Note 1) Supply Voltage (V ) ................................................. 6V Short-Circuit Duration CC + + V ........................................................................................... 12V V ...................................................................................... 30 sec V ....................................................................................... 12V V ...................................................................................... 30 sec Input Voltage Driver Output ............................................... Indefinite + Driver ........................................................... V to V Receiver Output ........................................... Indefinite Receiver ................................................. 30V to 30V Operating Temperature Range ON/OFF Pin .............................................. GND to 12V LT1080C/LT1081C ................................. 0 C to 70 C Output Voltage LT1080I/LT1081I................................ 40 C to 85 C + Driver ................................. (V + 30V) to (V 30V) LT1080M/LT1081M (OBSOLETE) ... 55 C to 125 C Receiver .................................. 0.3V to (V + 0.3V) Storage Temperature Range ..................65 C to 150 C CC Lead Temperature (Soldering, 10 sec)................. 300 C / PACKAGE ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART TOP VIEW NUMBER NUMBER NC 1 18 ON/OFF + + C1 2 17 V C1 1 16 V CC CC LT1080CN LT1081CN + + V 3 16 GND V 2 15 GND LT1080CSW LT1081CSW C1 4 15 TR1 OUT C1 3 14 TR1 OUT LT1080 LT1080IN LT1081IN + + LT1081 C2 5 14 REC1 IN C2 4 13 REC1 IN LT1080ISW LT1081ISW C2 6 13 REC1 OUT C2 5 12 REC1 OUT V 7 12 TR1 IN V 6 11 TR1 IN TR2 OUT 8 11 TR2 IN TR2 OUT 7 10 TR2 IN REC2 IN 9 10 REC2 OUT REC2 IN 8 9 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 = 150 C, q = 120 C/W, q = 50 C/W (N) T = 150 C, q = 120 C/W, q = 50 C/W (N) JMAX JA JC JMAX JA JC T = 150 C, q = 95 C/W, q = 27 C/W (SW) T = 150 C, q = 90 C/W, q = 26 C/W (SW) JMAX JA JC JMAX JA JC J PACKAGE J PACKAGE LT1080CJ LT1081CJ 18-LEAD CERDIP 16-LEAD CERDIP 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 LT1080MJ JMAX JA JC LT1081MJ 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. 10801fe 2 U WU U W W W