ST490ABDR

ST490AB Low power high speed RS-485/RS-422 transceiver Features Low supply current: 5 mA max -7 V to 12 V common mode input voltage range 70 mV typical input hysteresis Designed for 25 Mbps operation Operate from a single 5 V supply 4 kV ESD protection DIP-8 SO-8 Current limiting and thermal shutdown for driver overload protection Description The ST490A is a low power transceiver for RS- 485 and RS-422 communications. The device contains one driver and one receiver in full duplex configuration. The ST490A draws 5 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 Order code Temperature range Package Packaging ST490ABN -40 to 85 C DIP-8 50 parts per tube / 40 tube per box ST490ABDR -40 to 85 C SO-8 (tape and reel) 2500 parts per reel February 2008 Rev 5 1/17 www.st.com 17Contents ST490AB Contents 1 Pin configuration . 3 2 Truth tables 4 3 Maximum ratings . 5 4 Electrical characteristics . 6 5 Test circuit and typical characteristics . 8 6 Package mechanical data 12 7 Revision history . 16 2/17