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General Description

The MAX3460–MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 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 +2.1V output level with a 54? load, 20Mbps data rate, and output skew less than 2ns. Each part 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

Features

? Recommended for Profibus Applications

? Guaranteed 20Mbps Data Rate

? 20ns Transmitter and Receiver Propagation Delay

? 2ns Transmitter and Receiver Skew

? High Differential Driver Output Level (2.1V on 54?)

? Hot-Swap Versions

? 1μA Shutdown Supply Current

? Low Supply Current Requirements (2.5mA typ)

? Allow Up to 128 Transceivers on the Bus

? True Fail-Safe Receiver while Maintaining EIA/TIA-485 Compatibility

? Designed for Multipoint Transmissions on Long or Noisy Bus Lines

? Full Duplex and Half Duplex Versions Available

? Phase Controls to Correct for Twisted-Pair Reversal for 14-Pin Versions

? Current-Limiting and Thermal Shutdown for

Driver Overload Protection

Applications

High-Speed RS-485 Communications

High-Speed RS-422 Communications

Level Translators

Industrial-Control Local Area Networks

Profibus Applications