LTC1485 Differential Bus Transceiver FEATURES DESCRIPTION n ESD Protection Over 10kV The LTC 1485 is a low power differential bus/line trans- n Low Power: I = 1.8mA Typ ceiver designed for multipoint data transmission standard CC n 28ns Typical Driver Propagation Delays RS485 applications with extended common-mode range with4nsSkew (12V to 7V). It also meets the requirements of RS422. n Designed for RS485 or RS422 Applications The CMOS with Schottky design offers significant power n Single 5V Supply savings over its bipolar counterpart without sacrificing n 7V to 12V Bus Common-Mode Range Permits ruggedness against overload or ESD damage. 7VGround Difference Between Devices on the Bus n The driver and receiver feature three-state outputs, with Thermal Shutdown Protection n the driver outputs maintaining high impedance over the Power-Up/Down Glitch-Free Driver Outputs n entire common-mode range. Excessive power dissipa- Driver Maintains High Impedance in Three-State or tion caused by bus contention or faults is prevented by a with the Power Off n thermal shutdown circuit which forces the driver outputs Combined Impedance of a Driver Output and into a high impedance state. I/O pins are protected against ReceiverAllows up to 32 Transceivers on the Bus n multiple ESD strikes of over 10kV. 60mV Typical Input Hysteresis n Pin-Compatible with the SN75176A, DS75176A, The receiver has a fail-safe feature which guarantees a andSN75LBC176 high output state when the inputs are left open. Both AC and DC specifications are guaranteed from 40C to 85C and 4.75V to 5.25V supply voltage range. APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Low Power RS485/RS422 Transceiver n Level Translator TYPICAL APPLICATION 5V DE 5V DE 3 3 8 8 LTC1485 LTC1485 6 6 4 4 DI 120 120 DI DRIVER DRIVER 7 7 4000 FT 24 GAUGE TWISTED PAIR 1 1 RO RECEIVER RO RECEIVER 5 5 2 2 RE RE 1485 TA01 1485fb 1 For more information www.linear.com/LTC1485LTC1485 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) Supply Voltage (V ) ............................................... 12V TOP VIEW CC Control Input Voltages ................... 0.5V to V + 0.5V CC RO 1 8 V CC R Control Input Currents ......................... 50mA to 50mA 2 RE 7 B Driver Input Voltages ..................... 0.5V to V + 0.5V CC DE 3 6 A D Driver Input Currents ........................... 25mA to 25mA DI 4 5 GND Driver Output Voltages ........................................... 14V N8 PACKAGE S8 PACKAGE Receiver Input Voltages ........................................ 14V 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC T = 125C, = 100C/W (N) JMAX JA Receiver Output Voltages .............. 0.5V to V + 0.5V CC T = 150C, = 150C/W (S) JMAX JA Operating Temperature Range LTC1485C .............................................. 0C to 70C LTC1485I ........................................... 40C to 85C Storage Temperature Range ................ 65C to 150C Lead Temperature (Soldering, 10 sec.) ................ 300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1485CN8 LTC1485CN8 1485 8-Lead Plastic DIP 0C to 70C LTC1485IN8 LTC1485IN8 1485I 8-Lead Plastic DIP 40C to 85C LTC1485CS8 LTC1485CS8 1485 8-Lead Plastic SOIC 0C to 70C LTC1485IS8 LTC1485IS8 1485I 8-Lead Plastic SOIC 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: