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

 

Part Number	Replacement	Explanation

Description

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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.

MAX1482, MAX1483: Typical Operating Circuit Enlarge+

Key Features

• 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 Bus—Guaranteed (1/8-unit load)
• Current Limiting and Thermal Shutdown for Driver Overload Protection

Applications/Uses

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