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.
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. Drivers are short-circuit current limited and are 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 together externally to serve as a direction control.
Key Features
Applications/Uses
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
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