ST490A Datasheet | STMicroelectronics

DESCRIPTION The ST490A is a low power transceiver for RS-485 and RS-422 munications. The device contains one driver and one receiver in full duplex configuration. The ST490A draws 5m A (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V supply. ORDERING CODES Type ST490ACN ST490ABN ST490ACD ST490ABD ST490ACDR ST490ABDR Temperature Range 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C Package 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. ments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel DIP-8 DIP-8 SO-8 (Tube) SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel) November 2002 1/11 PIN CONFIGURATION PIN DESCRIPTION Pl N N° 1 2 3 4 5 6 7 8 SYMBOL VCC RO DI GND Z Y B A Supply Voltage Receiver Output. Driver Input. Ground Inverting Driver Output Non-inverting Driver Output Inverting Receiver Input Non-inverting Receiver Input NAME AND FUNCTION TRUTH TABLE (DRIVER) INPUT DI L H Y L H OUTPUTS Z H L TRUTH TABLE (RECEIVER) DIFFERENTIAL INPUT A-B ≥ -0.2V between -0.2V to 0.2V ≤ -0.2V OPEN ?= Irrelevant; Z=High Impedance OUTPUT RO H ? L H X= Don’t Care; Z=High Impedance ABSOLUTE MAXIMUM RATINGS Symbol VCC VDI VY, VZ VA, VB VRO ESD Supply Voltage Driver Input Voltage Driver Output Voltage Receiver Input Voltage Receiver Output Voltage Human Boby Model Parameter Value 7 -0.5 to 7 -7.5 to 12.5 -7.5 to 12.5 -0.3 to (VCC + 0.3) 3.5 Unit V V V V V KV Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 2/11 ELECTRIC...