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MAX3468：+5V, Fail-Safe, 40Mbps, PROFIBUS RS-485/RS-422 Transceivers

5V, Fail-Safe, 40Mbps PROFIBUS RS-485/RS-422 Transceivers

The MAX3465-MAX3469 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 minimum output level with a 54Ω load, 40Mbps 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 Recommended for PROFIBUS Applications Up to 40Mbps Data Rate 15ns Transmitter Propagation Delay 20ns 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

MAX3465, MAX3466, MAX3467, MAX3468, MAX3469: Pin Configurations and Typical Operating Circuit Applications/Uses High-Speed RS-422 Communications High-Speed RS-485 Communications Industrial-Control Local Area Networks Level Translators PROFIBUS Applications

DataSheet

Parametrics

Quality and Environmental Data

• MAX3468.pdf

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