ST485B is a low power RS-485/RS-422 transceiver from ST. It features low quiescent current (300µA), -7V~12V input voltage range, 30ns propagation delay and 5ns skew.
The ST485B and ST485C are low‑power RS‑485/RS‑422 transceivers designed for multipoint bus applications. They operate from a single 5 V supply, feature current‑limiting and thermal shutdown, and support up to 64 transceivers on the same bus.
The devices are offered in DIP‑8 and SO‑8 packages, with commercial, industrial and automotive temperature ranges. Detailed electrical characteristics, pin configurations, truth tables and maximum ratings are provided in the datasheet.
| Quiescent current | 300 µA typical |
|---|---|
| Supply voltage range | -7 V to 12 V common‑mode |
| Propagation delay | 30 ns |
| Input hysteresis | 70 mV typical |
| Maximum data rate | 2.5 Mbps |
| Operating temperature (automotive grade) | -55 °C to 125 °C |
| Maximum bus load | Up to 64 transceivers |
The typical quiescent supply current is 300 µA.
The transceiver allows up to 64 devices on the bus.
The maximum data rate is 2.5 Mbps.
The driver propagation delay is 30 ns.