LTC1690 Differential Driver and Receiver Pair with Fail-Safe Receiver Output DESCRIPTIO FEATURES n No Damage or Latchup to 15kV ESD (Human Body The LTC 1690 is a low power receiver/driver pair that is Model), IEC1000-4-2 Level 4 ( 8kV) Contact and compatible with the requirements of RS485 and RS422. Level 3 ( 8kV) Air Discharge The receiver offers a fail-safe feature that guarantees a n Guaranteed High Receiver Output State for high receiver output state when the inputs are left open, Floating, Shorted or Terminated Inputs with No shorted together or terminated with no signal present. No Signal Present external components are required to ensure the high n Drives Low Cost Residential Telephone Wires receiver output state. n I = 600m A Max with No Load CC Separate driver output and receiver input pins allow full n Single 5V Supply duplex operation. Excessive power dissipation caused by n 7V to 12V Common Mode Range Permits 7V bus contention or faults is prevented by a thermal shut- Ground Difference Between Devices on the Data Line down circuit which forces the driver outputs into a high n Power-Up/Down Glitch-Free Driver Outputs Permit impedance state. Live Insertion or Removal of Transceiver n The LTC1690 is fully specified over the commercial and Driver Maintains High Impedance with the Power Off n industrial temperature ranges. The LTC1690 is available in Up to 32 Transceivers on the Bus n 8-Pin SO, MSOP and PDIP packages. Pin Compatible with the SN75179 and LTC490 n Available in SO, MSOP and PDIP Packages , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S n Battery-Powered RS485/RS422 Applications n Low Power RS485/RS422 Transceiver n Level Translator n Line Repeater TYPICAL APPLICATIO Driving a 1000 Foot STP Cable LTC1690 LTC1690 5 Y1 A2 8 D1 3 120 120 2 D1 DRIVER RECEIVER R2 6 7 B2 Z1 B2 A2 7 B1 Z2 6 R2 2 120 120 3 R1 RECEIVER DRIVER D2 8 5 A1 Y2 1690 TA01a 1690 TA01 1 U ULTC1690 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (V ) .............................................. 6.5V Operating Temperature Range CC Driver Input Voltage..................... 0.3V to (V + 0.3V) LTC1690C ........................................ 0 C T 70 C CC A Driver Output Voltages ................................. 7V to 10V LTC1690I..................................... 40 C T 85 C A Receiver Input Voltages ......................................... 14V Storage Temperature Range ................. 65 C to 150 C Receiver Output Voltage .............. 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300 C CC Junction Temperature........................................... 125 C PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW NUMBER NUMBER TOP VIEW V 1 A 8 CC R LTC1690CN8 V 1 8 A CC LTC1690CMS8 R 2 7 B R 2 7 B LTC1690IN8 D 3 6 Z D 3 Z 6 5 GND 4 Y LTC1690CS8 D GND 4 5 Y MS8 PACKAGE LTC1690IS8 8-LEAD PLASTIC MSOP S8 PACKAGE N8 PACKAGE T = 125 C, q = 200 C/W 8-LEAD PLASTIC SO 8-LEAD PLASTIC DIP JMAX JA MS8 PART MARKING S8 PART MARKING T = 125 C, q = 130 C/W (N) JMAX JA T = 125 C, q = 135 C/W (S) 1690 JMAX JA LTDA 1690I Consult factory for Military Grade Parts The l denotes the specifications which apply over the full operating DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T = 25 C. V = 5V 5% (Notes 2, 3) A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Differential Driver Output Voltage (Unloaded) I = 0 l V V OD1 O CC V Differential Driver Output Voltage (with Load) R = 50W (RS422) l2V OD2 R = 22W or 27W (RS485), Figure 1 l 1.5 5 V V Differential Driver Output Voltage (with Common Mode) V = 7V to 12V, Figure 2 1.5 5 V OD3 TST D V Change in Magnitude of Driver Differential Output R = 22W , 27W or 50W , Figure 1 l 0.2 V OD Voltage for Complementary Output States V = 7V to 12V, Figure 2 TST V Driver Common Mode Output Voltage R = 22W , 27W or 50W , Figure 1 l 3V OC D V Change in Magnitude of Driver Common Mode R = 22W , 27W or 50W , Figure 1 l 0.2 V OC Output Voltage for Complementary Output States V Input High Voltage Driver Input (D) l2V IH V Input Low Voltage Driver Input (D) l 0.8 V IL I Input Current Driver Input (D) l 2 m A IN1 I Input Current (A, B) V = 0V or 5.25V, V = 12V l 1mA IN2 CC IN V = 0V or 5.25V, V = 7V l 0.8 mA CC IN V Differential Input Threshold Voltage for Receiver 7V V 12V l 0.20 0.01 V TH CM D V Receiver Input Hysteresis V = 0V 30 mV TH CM 2 U W U W U WW