MAX3460 Datasheet | Maxim Integrated

19-2217; Rev 1; 2/03 +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers General Description The MAX3460- MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 munications. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards. The transceiver plies 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. o Guaranteed 20Mbps Data Rate o 20ns Transmitter and Receiver Propagation Delay o 2ns Transmitter and Receiver Skew o High Differential Driver Output Level (2.1V on 54Ω) o Hot-Swap Versions o 1µA Shutdown Supply Current o Low Supply Current Requirements (2.5m A typ) o Allow Up to 128 Transceivers on the Bus o True Fail-Safe Receiver while Maintaining EIA/TIA485 patibility o Designed for Multipoint Transmissions on Long or Noisy Bus Lines o Full Duplex and Half Duplex Versions Available o Phase Controls to Correct for Twisted-Pair Reversal for 14-Pin Versions o Current-Limiting and Thermal Shutdown for Driver Overload Protection Features o Remended for...