ST485BN STMicroelectronics

ST485B ST485C 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 30 ns propagation delay, 5 ns skew DIP-8 SO-8 Operate from a single 5 V supply Current limiting and thermal shutdown for The ST485 is available in three temperature driver overload protection range: commercial (0 C to 70 C), industrial (- 40 Allows up to 64 transceivers on the bus C to 85 C) and automotive (- 55 C to 125 C). Description The ST485 is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. This transceiver draw 300 A (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 placed the driver outputs into a high-impedance state. The ST485 is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applications). Table 1. Device summary Order code Temperature range Package Packaging ST485CN 0 to 70 C DIP-8 50 parts per tube / 40 tube per box ST485BN - 40 to 85 C DIP-8 50 parts per tube / 40 tube per box ST485CDR 0 to 70 C SO-8 (tape and reel) 2500 parts per reel ST485BDR - 40 to 85 C SO-8 (tape and reel) 2500 parts per reel February 2009 Rev 16 1/19 www.st.com 19Contents ST485B - ST485C Contents 1 Pin configuration 3 1.1 Pin description 3 2 Truth tables 4 3 Maximum ratings 5 4 Electrical characteristics . 6 4.1 Driver switching characteristics . 7 4.2 Receiver switching characteristics . 8 5 Test circuit and typical characteristics 9 6 Package mechanical data 14 7 Revision history . 18 2/19