MAX3089 Datasheet

• For Fault-Tolerant Applications:
  MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4- Unit Load, +3.3V RS-485 Transceiver
• For Low-Voltage Applications:
  MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package
• For Multiple Transceiver Applications:
  MAX3030E-MAX3033E: ±15kV ESD-Protected, +3.3V, Quad, RS-422 Transmitters
  MAX3040-MAX3045: ±10kV ESD-Protected, Quad, +5V, RS-485/RS-422 Transmitters

• Industrial-Control Local Area Networks
• Level Translators
• RS-422/RS-485 Communications
• Transceivers for EMI-Sensitive Applications

The MAX3089 high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3089's slew rate is selectable between 115kbps, 500kbps, and 10Mbps by driving a selector pin with a single three-state driver.

These transceivers typically draw 375µA of supply current when unloaded, or when fully loaded with the drivers disabled.

All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The MAX3089 is selectable between half-duplex and full-duplex operation. It also features independently programmable receiver and transmitter output phase via separate pins.