20µA, 1/8-Unit-Load, Slew-Rate-Limited, RS-485 Transceivers

The MAX1482 and MAX1483 are low-power transceivers for RS-485 and RS-422 communication. Both feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables. Data rates are guaranteed up to 250kbps.

The MAX1482/MAX1483 draw only 20µA of supply current. Additionally, they have a low-current shutdown mode that consumes only 0.1µA. Both parts operate from a single +5V supply.

Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit.

The MAX1482 is full duplex and the MAX1483 is half duplex. Both parts have a 1/8-unit-load input impedance that guarantees up to 256 transceivers on the bus.

Applications

* Industrial Control Local Area Networks * Large 256-Node LANs * Low-Power RS-485/RS-422 Networks * Transceivers for EMI-Sensitive Applications

* Low 20µA Operating Current

* Slew-Rate Limited for Reduced EMI and Reduced Reflections

* 0.1µA Low-Current Shutdown Mode

* Designed for RS-485 and RS-422 Applications

* Operate from a Single +5V Supply

* -7V to +12V Common-Mode Input Voltage Range

* Allows up to 256 Transceivers on the BusGuaranteed (1/8-unit load)

* Current Limiting and Thermal Shutdown for Driver Overload Protection