GM485E

The GM485E is a high-speed half-duplex transceiver for RS-485/RS-422 communications, incorporating one driver and one receiver. It features a failsafe circuit that ensures a logic-high output at the receiver when the receiver input is open or short-circuited. If all drivers connected to a terminated bus are disabled (high-impedance), the receiver will output a logic high. The GM485E incorporates a slew-rate-limited driver to reduce EMI and reflections caused by improperly terminated cables, enabling error-free data transmission at up to 500kbps. In addition, the GM485E receiver features 1/8 unit load input impedance, allowing up to 256 transceivers to be connected on the bus.

Applications

• Industrial control
• Security systems
• Electric, water, and gas meters
• Lighting systems
• EMI-sensitive transceiver applications
• Instrumentation

Key features

• 1nA low-current shutdown mode
• True fail-safe receiver compatible with EIA/TIA-485
• Industry-standard 8-pin SOP package
• Robust slew rate control for error-free data transmission
• Up to 256 transceivers on the bus
• Enhanced ESD protection for RS-485/RS-422 I/O pins