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MAX3291：RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication

The MAX3291/MAX3292 high-speed RS-485/RS-422 transceivers feature driver preemphasis circuitry, which extends the distance and increases the data rate of reliable communication by reducing intersymbol interference (ISI) caused by long cables. The MAX3291 is programmable for data rates of 5Mbps to 10Mbps, while the MAX3292 is programmable for data rates up to 10Mbps by using a single external resistor. The MAX3291/MAX3292 are full-duplex devices that operate from a single +5V supply and offer a low-current shutdown mode that reduces supply current to 100nA. They feature driver output short-circuit current limiting and a fail-safe receiver input that guarantees a logic-high output if the input is open circuit. A 1/4-unit-load receiver input impedance allows up to 128 transceivers on the bus.

Key Features Preemphasis Increases the Distance and Data Rate of Reliable RS-485/RS-422 Communication Data Rate Optimized for 5Mbps to 10Mbps (MAX3291) Programmable up to 10Mbps (MAX3292) 100nA Low-Current Shutdown Mode Allow Up to 128 Transceivers on the Bus -7V to +12V Common-Mode Input Voltage Range Pin-Compatible with '75180, MAX489, MAX491 MAX3080, MAX3083, MAX3086, MAX1482

MAX3291, MAX3292: Typical Operating Circuit Applications/Uses Industrial Control Local Area Networks Long-Distance, High-Speed RS-485/RS-422 Communications Telecommunications

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