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High-speed differential-bus transceivers

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article image 40Mbps Profibus transceivers.

MAXIM Integrated Products has introduced the MAX3465-MAX3469, fail-safe 40Mbps Profibus transceivers, available from Arrow .

These devices are high-speed, differential-bus transceivers for RS485 and RS422 communications. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards.

The transceiver complies with the Profibus specification, providing an output level greater than 2.1V with a 54Ω load, up to a 40Mbps data rate, and an output skew of less than 2ns.

Each device contains one, three-state differential line driver and one differential-input line receiver.

The devices operate from a 5V supply and feature true fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This enables all receiver outputs on a terminated bus to output logic highs when all transmitters are disabled.

All devices feature a 1/4 standard unit-load receiver-input impedance that allows 128 transceivers on the bus.

Driver and receiver propagation delays are guaranteed under 20ns for multidrop, clock distribution applications. The drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry.

The driver and receiver feature active-high and active-low enables, respectively, that can be connected externally to serve as a direction control.

The MAX3465-MAX3469 are available in the commercial and extended temperature ranges in the narrow eight-pin SO and eight-pin PDIP packages (MAX3465 and MAX3166) and the narrow 14-pin SO and 14-pin PDIP packages (MAX3467, MAX3468 and MAX3469).

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