LTC1483 Ultra-Low Power RS485 Low EMI Transceiver with Shutdown DESCRIPTIO FEATURES n Low Power: I = 120m A Max with Driver Disabled The LTC 1483 is an ultra-low power differential line trans- CC n I = 500m A Max with Driver Enabled, No Load ceiver designed for data transmission standard RS485 CC n 1m A Quiescent Current in Shutdown Mode applications with extended common-mode range ( 7V to n Controlled Slew Rate Driver for Reduced EMI 12V). It will also meet the requirements of RS422. The n Single 5V Supply LTC1483 features output drivers with controlled slew rate, n Drivers/Receivers Have 10kV ESD Protection decreasing the EMI radiated from the RS485 lines, and n 7V to 12V Common-Mode Range Permits 7V improving signal fidelity with misterminated lines. The Ground Difference Between Devices on the Data Line CMOS design offers significant power savings over its n Thermal Shutdown Protection bipolar counterparts without sacrificing ruggedness against n Power Up/Down Glitch-Free Driver Outputs Permit overload or ESD damage. Typical quiescent current is only Live Insertion or Removal of Transceiver 80m A while operating and less than 1m A in shutdown. n Driver Maintains High Impedance in Three-State The driver and receiver feature three-state outputs, with or with the Power Off the driver outputs maintaining high impedance over the n Up to 32 Transceivers on the Bus entire common-mode range. Excessive power dissipation n Pin Compatible with the LTC485 caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs APPLICATI S into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the n Battery-Powered RS485/RS422 Applications inputs are left open. I/O pins are protected against multiple n Low Power RS485/RS422 Transceiver ESD strikes of over 10kV. n Level Translator The LTC1483 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin DIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATI RO1 V CC1 R RE1 DI R TERM DE1 D DI1 GND1 A B R TERM RO2 V CC2 R RE2 RO DE2 D DI2 GND2 LTC1483 TA01 1483 TA02 sn1483 1483fs 1 UO UO ULTC1483 ABSOLUTEXAI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART Supply Voltage (V ) .............................................. 12V CC TOP VIEW NUMBER Control Input Voltage..................... 0.5V to V + 0.5V CC RO 1 8 V CC R Driver Input Voltage....................... 0.5V to V + 0.5V LTC1483CN8 CC RE 2 B 7 Driver Output Voltage ........................................... 14V LTC1483IN8 DE 3 6 A Receiver Input Voltage.......................................... 14V LTC1483CS8 D DI GND 4 5 Receiver Output Voltage ................ 0.5V to V + 0.5V LTC1483IS8 CC N8 PACKAGE S8 PACKAGE Operating Temperature Range 8-LEAD PDIP 8-LEAD PLASTIC SO S8 PART MARKING LTC1483C ....................................... 0 C T 70 C A T = 125 C, q = 130 C/ W (N8) JMAX JA 1483 LTC1483I.................................... 40 C T 85 C A T = 125 C, q = 150 C/ W (S8) JMAX JA 1483I Storage Temperature Range ................. 65 C to 150 C Consult factory for Military grade parts. Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS V = 5V, (Notes 2, 3) unless otherwise noted. CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Differential Driver Output Voltage (Unloaded) I = 0 l 5V OD1 O V Differential Driver Output Voltage (with Load) R = 50W (RS422) l2V OD2 R = 27W (RS485), Figure 1 l 1.5 5 V D V Change in Magnitude of Driver Differential Output R = 27W or R = 50W , Figure 1 l 0.2 V OD Voltage for Complementary Output States V Driver Common-Mode Output Voltage R = 27W or R = 50W , Figure 1 l 3V OC D V Change in Magnitude of Driver Common-Mode R = 27W or R = 50W , Figure 1 l 0.2 V OC Output Voltage for Complementary Output States V Input High Voltage DE, DI, RE l2V IH V Input Low Voltage DE, DI, RE l 0.8 V IL I Input Current DE, DI, RE l 2 m A IN1 I Input Current (A, B) DE = 0, V = 0V or 5.25V, V = 12V l 1.0 mA IN2 CC IN DE = 0, V = 0V or 5.25V, V = 7V l 0.8 mA CC IN V Differential Input Threshold Voltage for Receiver 7V V 12V l 0.2 0.2 V TH CM D V Receiver Input Hysteresis V = 0V l 45 mV TH CM V Receiver Output High Voltage I = 4mA, V = 200mV l 3.5 V OH O ID V Receiver Output Low Voltage I = 4mA, V = 200mV l 0.4 V OL O ID I Three-State (High Impedance) Output V = Max, 0.4V V 2.4V l 1 m A OZR CC O Current at Receiver R Receiver Input Resistance 7V V 12V l 12 25 kW IN CM I Supply Current No Load, Output Enabled l 300 500 m A CC No Load, Output Disabled l 80 120 m A I Supply Current in Shutdown Mode DE = 0, RE = V 110 m A SHDN CC I Driver Short-Circuit Current, V = HIGH 7V V 12V l 35 250 mA OSD1 OUT O I Driver Short-Circuit Current, V = LOW 7V V 12V l 35 250 mA OSD2 OUT O I Receiver Short-Circuit Current 0V V V l785mA OSR O CC sn1483 1483fs 2 U WU U W W W