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 54Ω 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 54Ω)
♦ 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