STMicroelectronics ST485E
15 kV ESD protected, low-power RS-485/RS-422 transceiver
The ST485E is a low power transceiver for RS-485 and RS-422 communication. Each driver output and receiver input is protected against ±15 kV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration. This transceiver draws 300 µA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications).
Key features
- Operates from a single 5V supply
- 300µA low quiescent current
- Designed for RS485 interface application
- Common mode input voltage range from -7 to 12V
- Driver maintains high impedance in 3-state or with the power OFF
- 70mV typical input hysteresis
- 30ns propagation delay, 5ns skew
- Current limiting and thermal shutdown for driver overload protection
- Allows up to 256 transceivers on the bus
- Temperature range from -55°C to 125°C
Applications
- Industrial automation
- Building automation
- Energy management systems
- Transportation systems
- Telecommunications
- Medical equipment
- Remote monitoring and control
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