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Key Specifications
Product Description
The UM491EESE is ±8kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-422 communication that contain one driver and one receiver. 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 UM491EESE offers higher driver output slew-rate limits, allowing transmit speeds up to 2.5Mbps. The device features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±8kV using the Human Body Model.
These transceivers typically draw 600µA 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 UM491EESE is intended for full-duplex communications.
Features
- ESD Protection for RS-422 I/O Pins
±8kV, Human Body Model
- True Fail-Safe Receiver While Maintaining EIA/TIA-422 Compatibility
- Enhanced Slew-Rate Limiting Facilitates
- Error-Free Data Transmission
- 1nA Low-Current Shutdown Mode
- Allow Up to 256 Transceivers on the Bus
Typical Operating Circuits
 Pin Configurations
 Applications
- RS-422 Communications
- Level Translators
- Transceivers for EMI-Sensitive Applications
- Industrial-Control Local Area Networks
Functions Tables
Ordering Information
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Application Notes
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