UM3488EESA

The UM3488/UM3491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-422 communication that contain one driver and one receiver. The UM3491 contains an additional receiver and driver enable control. The device features 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 UM3488/UM3491 allows transmit speeds up to 10Mbps. The device features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model. These transceivers typically draw 180μA of supply current when unloaded, or when fully loaded with the drivers disabled. The device has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The UM3488/UM3491 is intended for full-duplex communications.

Applications

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

Key features

• ESD Protection for RS-422 I/O Pins ±15kV, Human Body Model
• True Fail-Safe Receiver while Maintaining EIA/TIA-422 Compatibility
• Maximum Data Rate up to 10Mbps
• Error-Free Data Transmission
• 1nA Low-Current Shutdown Mode (UM3491)
• Allow up to 256 Transceivers on the Bus