LTC2879X 60V Fault Tolerant RS485/RS422 Transceiver with Operation to 175C FEATURES DESCRIPTION n Guaranteed Operation from 55C to 175C The LTC 2879X is a rugged RS485/RS422 transceiver n Fully Tested at 175C designed to operate over a wide temperature range of n Protected from Overvoltage Line Faults to 60V 55C to 175C. Special processing steps are used to n 52kV ESD Interface Pins, 15kV All Other Pins prevent intermetallic growth that can cause metal voids n Level 4 IEC61000-4-4 Electrical Fast Transient on standard parts operating at high temperatures. Low- n 25V Working Common Mode Range drift, low-leakage circuitry and lack of a thermal shutdown n 20Mbps Maximum Baud Rate circuit allow the LTC2879X to meet critical specifications, n Operates with V from 3V to 5.5V tested 100% at 175C. CC n PROFIBUS IEC 61158-2 Compliant (V 4.5V) CC The LTC2879X also meets the specifications for n Fully Balanced Differential Receiver Thresholds with PROFIBUS-DP (IEC 61158-2) supporting all data rates 240mV Hysteresis for Superior Noise Tolerance and from 9.6kbps to 12Mbps. Low Duty Cycle Distortion n The LTC2879X is exceptionally robust, tolerating 60V Receiver Failsafe for Open, Shorted and Terminated faults on the bus pins and protected to 52kV ESD. These Conditions n devices are suitable for harsh environments or where 24V Available in a Tiny 3mm 3mm MSOP Package power might be inadvertently connected. Extended 25V input common mode operating range and full failsafe APPLICATIONS operation improve data communication reliability in noisy n Oil and Gas Exploration systems. n High Temperature Industrial Control The LTC2879X meets RS485, RS422, and PROFIBUS-DP n PROFIBUS-DP specifications with a supply voltage of 4.5V to 5.5V with n Military Systems full RS485/RS422 compatibility down to 3V. n Harsh Environments All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 175C, 20Mbps, V = 5V 3V TO 5.5V CC DI 0.1F V CC LTC2879X 5V/DIV A AND B 2V/DIV RS485 RO CABLE A AB RE C 2V/DIV 120 120 SENSOR DI RO B Z = 120 O 5V/DIV 2879X TA01b DE 50ns/DIV GND 2879X TA01a R = 54 L C = 100pF (FIGURE 5) L Rev 0 1 Document Feedback For more information www.analog.comLTC2879X ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2, 5) LTC2879X Supply Voltages (V ) .................................. 0.3V to 6V CC TOP VIEW Logic Input Voltages (RE, DE, DI) ................ 0.3V to 6V RO 1 8 V CC RE 2 9 7 B Line Interface I/O (A, B) .............................. 60V to 60V DE 3 GND 6 A 5 GND DI 4 Line Interface I/O Difference (AB) ..........120V to 120V MS8E PACKAGE Receiver Output (RO) 8-LEAD PLASTIC MSOP LTC2879X ....................................0.3V to V + 0.3V T = 175C, = 40C/W, = 10C/W CC JMAX JA JC EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB Operating Ambient Temperature Range LTC2879X .......................................... 55C to 175C Storage Temperature Range .................. 65C to 150C ORDER INFORMATION