SHUTDOWN CURRENT (A) LTC1349 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in Shutdown FEATURES DESCRIPTIO Low Supply Current: 300A The LTC 1349 is a 3-driver/ 5-receiver RS232 transceiver Two Receivers Kept Alive in Shutdown with very low supply current. In the no load condition, the ESD Protection Over 10kV supply current is only 300A. The charge pump only Operates from a Single 5V Supply requires four 0.1F capacitors. Uses Small Capacitors: 0.1F In Shutdown mode, two receivers are kept alive and the Operates to 120k Baud supply current is 35A. All RS232 outputs assume a high Three-State Outputs Are High Impedance When Off impedance state in Shutdown and with the power off. Output Overvoltage Does Not Force Current The LTC1349 is fully compliant with all data rate and Back into Supplies overvoltage RS232 specifications. The transceiver can RS232 I/O Lines Can Be Forced to 25V operate up to 120k baud with a 2500pF, 3k load. Both Without Damage driver outputs and receiver inputs can be forced to 25V Pin Compatible with LT1137A and LT1237 without damage, and can survive multiple 10kV ESD Flowthrough Architecture strikes. U APPLICATIO S Notebook Computers Palmtop Computers , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Quiescent and Shutdown Supply Current 3-Drivers/5-Receivers with Shutdown vs Temperature 1200 60 + 1 28 V V LTC1349 C1 C4 2 27 0.1F V CC 0.1F 1000 50 C3 3 26 0.1F C2 SHUTDOWN 4 25 0.1F 800 40 DRIVER 1 IN CURRENT 5 24 DRIVER 1 OUT RX1 OUT 6 23 600 30 RX1 IN DRIVER 2 IN 7 22 DRIVER 2 OUT RX2 OUT QUIESCENT 8 21 20 400 RX2 IN CURRENT RX3 OUT 9 20 RX3 IN RX4 OUT 10 200 10 19 RX4 IN DRIVER 3 IN 11 18 DRIVER 3 OUT RX5 OUT 0 0 12 17 40 20 0 20 40 60 80 100 RX5 IN GND 13 16 TEMPERATURE (C) ON/OFF NC TEST CONDITION: 14 15 NC NC V = 5V, ALL DRIVER INPUTS TIED TO V . CC CC LTC1349 TA02 LTC1349 TA01 1349fa 1 QUIESCENT CURRENT (A) U ULTC1349 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO Supply Voltage (V ) ................................................ 6V CC TOP VIEW ORDER PART + Input Voltage V 1 28 V NUMBER V 2 27 C2+ CC Driver ....................................... 0.3V to V + 0.3V CC + C1 3 26 C2 Receiver ............................................... 25V to 25V C1 4 25 DR1 IN On/Off Pin.................................. 0.3V to V + 0.3V LTC1349CG CC DR1 OUT 5 24 RX1 OUT Output Voltage RX1 IN 6 23 DR2 IN LTC1349CNW DR2 OUT 7 22 RX2 OUT Driver .................................................... 25V to 25V LTC1349CSW RX2 IN 8 21 RX3 OUT Receiver .................................... 0.3V to V + 0.3V LTC1349IG CC RX3 IN 9 20 RX4 OUT LTC1349INW Short Circuit Duration RX4 IN 10 19 DR3 IN + DR3 OUT 11 LTC1349ISW V ................................................................... 30 sec 18 RX5 OUT RX5 IN 12 17 GND V ................................................................... 30 sec 13 ON/OFF 16 NC Driver Output .............................................. Indefinite NC 14 15 NC Receiver Output .......................................... Indefinite G PACKAGE NW PACKAGE 28-LEAD SSOP 28-LEAD PDIP Operating Temperature Range SW PACKAGE 28-LEAD PLASTIC SO Commercial (LTC1349C) ........................ 0C to 70C T = 125C, = 96C/W (G) JMAX JA Industrial (LTC1349I) ........................ 40C to 85C T = 125C, = 56C/W (NW) JMAX JA T = 125C, = 85C/W (SW) Storage Temperature Range ................ 65C to 150C JMAX JA Lead Temperature (Soldering, 10 sec)................. 300C Consult LTC Marketing for parts specified with wider operating temperature ranges. DC ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range. V = 5V, C1 = C2 = C3 = C4 = 0.1F, unless noted. CC PARAMETER CONDITIONS MIN TYP MAX UNITS Any Driver Output Voltage Swing 3k to GND Positive 5.0 7.0 V Negative 5.0 6.5 V Logic Input Voltage Level Input Low Level (V = High) 1.4 0.8 V OUT Input High Level (V = Low) 2.0 1.4 V OUT Logic Input Current V = 5V 5 A IN V = 0V 5 A IN Output Short-Circuit Current V = 0V 9 12 mA OUT Output Leakage Current Shutdown, V = 20V (Note 3) 10 500 A OUT Any Receiver Input Voltage Thresholds Input Low Threshold 0.8 1.3 V Input High Threshold 1.7 2.4 V Hysteresis 0.1 0.4 1.0 V Input Resistance 10V V 10V 3 5 7 k IN Output Voltage Output Low, I = 1.6mA (V = 5V) 0.2 0.4 V OUT CC Output High, I = 160A (V = 5V) 3.5 4.8 V OUT CC Output Short-Circuit Current Sinking Current, V = V 15 40 mA OUT CC Output Leakage Current Shutdown, 0 V V (Note 3) 110 A OUT CC Power Supply Generator + V Output Voltage I = 0mA 8.0 V OUT I = 12mA 7.5 V OUT V Output Voltage I = 0mA 8.0 V OUT I = 12mA 7.0 V OUT Supply Rise Time Shutdown to Turn-On 0.2 ms 1349fa 2 U WWW