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

Applications/Uses

• High-Speed RS-422 Communications
• High-Speed RS-485 Communications
• Industrial-Control Local Area Networks
• Level Translators
• PROFIBUS Applications

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