ADM485AR

Product Summary

The ADM485AR is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission and complies with both EIA Standards RS-485 and RS-422. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled, the outputs are tristated. The ADM485AR operates from a single +5 V power supply. Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if during fault conditions a significant temperature increase is detected in the internal driver circuitry.

Parametrics

ADM485AR absolute maximum ratings: (1)VCC: +7 V; (2)Inputs; (3)Driver Input (DI): -0.3 V to VCC + 0.3 V; (4)Control Inputs (DE, RE): -0.3 V to VCC + 0.3 V; (5)Receiver Inputs (A, B): -14 V to +14 V; (6)Outputs; (7)Driver Outputs: -14 V to +14 V; (8)Receiver Output: -0.5 V to VCC +0.5 V; (9)Power Dissipation 8-Pin DIP: 500 mW; (10)θJA, Thermal Impedance: +130℃/W; (11)Power Dissipation 8-Pin SOIC: 450 mW; (12)θJA, Thermal Impedance: +170℃/W; (13)Power Dissipation 8-Pin Cerdip: 500 mW; (14)θJA, Thermal Impedance: +125℃/W; (15)Operating Temperature Range, Commercial (J Version): 0℃ to +70℃; Industrial (A Version): -40℃ to +85℃; (16)Storage Temperature Range: -65℃ to +150℃; (17)Lead Temperature (Soldering, 10 sec): +300℃; (18)Vapour Phase (60 sec): +215℃; (19)Infrared (15 sec): +220℃.

Features

ADM485AR features: (1)Meets EIA RS-485 Standard; (2)5 Mb/s Data Rate; (3)Single +5 V Supply; (4)-7 V to +12 V Bus Common-Mode Range; (5)High Speed, Low Power BiCMOS; (6)Thermal Shutdown Protection; (7)Short Circuit Protection; (8)Zero Skew Driver; (9)Driver Propagation Delay: 10 ns; (10)Receiver Propagation Delay: 25 ns; (11)High Z Outputs with Power Off; (12)Superior Upgrade for LTC485.

Diagrams