LTC485 Low Power RS485 Interface Transceiver FEATURES DESCRIPTION n Low Power: I = 300A Typ The LTC 485 is a low power differential bus/line trans- CC n Designed for RS485 Interface Applications ceiver designed for multipoint data transmission standard n Single 5V Supply RS485 applications with extended common mode range n 7V to 12V Bus Common Mode Range Permits (12V to 7V). It also meets the requirements of RS422. 7V Ground Difference Between Devices on the Bus The CMOS design offers significant power savings over n Thermal Shutdown Protection its bipolar counterpart without sacrificing ruggedness n Power-Up/Down Glitch-Free Driver Outputs against overload or ESD damage. Permit Live Insertion or Removal of Transceiver n The driver and receiver feature three-state outputs, with Driver Maintains High Impedance in Three-State the driver outputs maintaining high impedance over the or with the Power Off n entire common mode range. Excessive power dissipa- Combined Impedance of a Driver Output and tion caused by bus contention or faults is prevented by a Receiver Allows Up to 32 Transceivers on the Bus n thermal shutdown circuit which forces the driver outputs 70mV Typical Input Hysteresis n into a high impedance state. 30ns Typical Driver Propagation Delays with 5ns Skew for Up to 2.5MB Operation The receiver has a fail-safe feature which guarantees a n Pin Compatible with 60V Protected LTC2862 high output state when the inputs are left open. The LTC485 is fully specified over the commercial and APPLICATIONS extended industrial temperature range. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Low Power RS485/RS422 Transceiver Technology Corporation. All other trademarks are the property of their respective owners. n Level Translator TYPICAL APPLICATION Driver Outputs RO1 V CC1 R RE1 A Rt DE1 D DI1 GND1 Rt RO2 V CC2 R RE2 DE2 B D DI2 GND2 485 TA01a 485 TA01b 485fm 1 For more information www.linear.com/LTC485LTC485 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Supply Voltage ..........................................................12V RO 1 8 V Control Input Voltages .................... 0.5V to V + 0.5V CC CC R RE 2 7 B Driver Input Voltage ........................ 0.5V to V + 0.5V CC DE 3 6 A Driver Output Voltage.............................................. 14V D DI 4 5 GND Receiver Input Voltage ............................................ 14V Receiver Output Voltages ............... 0.5V to V + 0.5V CC N8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC Operating Temperature Range J8 PACKAGE LTC485I ........................................ 40C T 85C A 8-LEAD CERAMIC DIP LTC485C ............................................0C T 70C A OBSOLETE PACKAGE LTC485M (OBSOLETE) ................55C T 125C T = 125C, = 100C/W (N) A JMAX JA T = 150C, = 150C/W (S) JMAX JA Lead Temperature (Soldering, 10 sec) ...................300C T = 155C, = 100C/W (J) JMAX JA Storage Temperature Range .................. 65C to 150C