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
Applications/Uses
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
High-Speed RS-422 Communications
High-Speed RS-485 Communications
Industrial-Control Local Area Networks
Level Translators
Profibus Applications
Key Specifications: RS-422/485 Line Driver/Receivers
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