ST485EXDR STMicroelectronics

ST485EB ST485EC - ST485EX 15 kV ESD protected, low power RS-485/RS-422 transceiver Features Low quiescent current: 300 A Designed for RS-485 interface application - 7 V to 12 V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70 mV typical input hysteresis SO-8 30 ns propagation delay, 5 ns skew Operates from a single 5 V supply Current limiting and thermal shutdown for Driver is short-circuit current limited and is driver overload protection protected against excessive power dissipation by thermal shutdown circuitry that place the driver ESD protection: outputs into a high-impedance state. 15 kV (HBM) 8 kV (IEC-1000-4-2 contact discharge) The ST485E is designed for bi-directional data communications on multipoint bus transmission Allows up to 256 transceivers on the bus lines (half-duplex applications). Description The ST485E is a low power transceiver for RS- 485 and RS-422 communication. Each driver output and receiver input is protected against 15 kV electrostatic discharge (HBM) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration. This transceiver draws 300 A (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply. Table 1. Device summary Temperature Order codes Package Packaging range ST485EBD - 40 to 85 C SO-8 (tube) 100 parts per tube / 20 tube per box ST485ECDR 0 to 70 C SO-8 (tape and reel) 2500 parts per reel ST485EBDR - 40 to 85 C SO-8 (tape and reel) 2500 parts per reel ST485EXDR - 55 to 125 C SO-8 (tape and reel) 2500 parts per reel February 2009 Rev 14 1/18 www.st.com 18Contents ST485EB - ST485EC - ST485EX 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 . 17 2/18