DS481 - National Semiconductor

DS481 Low Power RS-485/RS-422 Multipoint Transceiver with Sleep Mode

The DS481 is a low-power transceiver for RS-485 and RS-422 communication. The device contains one driver and one receiver. The drivers slew rate allows for operation up to 2.0 Mbps (see Applications Information section). The transceiver draws 200 µA of supply current when unloaded or 0.2 µA when in the automatic sleep mode. Sleep mode is activated by inactiv.

Features

n n n n n n n Meets TIA/EIA RS-485 multipoint standard Sleep mode reduces ICC to 0.2 µA Guaranteed full load output voltage (V OD3) Low quiescent current: 200 µA typ −7V to +12V common-mode input voltage range TRI-STATE outputs on driver and receiver AC performance: — Driver transition time: 25 ns typ — Driver propagation delay: 40 ns typ — Driver skew: 1 ns typ — Receiver propagation delay: 200 ns typ — Receiver skew: 20 ns typ Half-duplex flow through pinout Operates from a single 5V supply Allows up to 128 transceivers on the bus (DS481N/M) Allows up to 64 tranceivers on the bus (DS481TN/M).