ST485ABDR STMicroelectronics

ST485AB Very high speed low power RS-485/RS-422 transceiver Features Low supply current: 5 mA max High data rate > 30 Mbps Designed for RS 485 interface applications -7 to 12 common mode input voltage range Driver maintains high impedance in 3-state or with the power off 70mV typical input hysteresis DIP-8 SO-8 Operate from single 5 supply 4 kV ESD protection Current limiting and thermal shutdown for driver overload protection The ST485A is designed for bi-directional data communications or multipoint bus transmission Latch-up free up to 500 mA lines. Description The ST485A is a low power, high speed transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST485A draws 3 mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit. Table 1. Device summary Temperature Order code Package Packaging range ST485ABN -40 to 85 C DIP-8 50parts per tube / 40tube per box ST485ABDR -40 to 85 C SO-8 (Tape & reel) 2500 parts per reel August 2007 Rev. 3 1/19 www.st.com 19Contents ST485AB Contents 1 Pin configuration 3 2 Truth tables 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Test circuit and typical characteristics 9 6 Package mechanical data 14 7 Revision history . 18 2/19