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DS485

National Semiconductor
Part Number DS485
Manufacturer National Semiconductor
Description Low Power RS-485/RS-422 Multipoint Transceiver
Published Mar 30, 2005
Detailed Description DS485 Low Power RS-485/RS-422 Multipoint Transceiver July 1998 DS485 Low Power RS-485/RS-422 Multipoint Transceiver Ge...
Datasheet PDF File DS485 PDF File

DS485
DS485

Overview
DS485 Low Power RS-485/RS-422 Multipoint Transceiver July 1998 DS485 Low Power RS-485/RS-422 Multipoint Transceiver General Description The DS485 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.
5 Mbps (see Applications Information section).
The transceiver draws 200 µA of supply current when unloaded or fully loaded with the driver disabled and operates from a single +5V supply.
The driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into TRI-STATE ® (High Impedance state) under fault conditions.
The driver guarantees a minimum of 1.
5V differential output voltage with maximum loading across the common mode range (VOD3).
The receiver has a failsafe feature that guarantees a logic-high output if the input is open circuit.
The DS485 is available in surface mount and DIP packages and is characterized for Industrial and Commercial temperature range operation.
Features n n n n n n Meets TIA/EIA RS-485 multipoint standard 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 32 transceivers on the bus Current-limiting and thermal shutdown for driver overload protection Industrial temperature range operation Pin and functional compatible with MAX485 and LTC485 n n n n n n Connection and Logic Diagram DIP and SOIC Truth Table DRIVER SECTION RE* X X X RE* L DE H H L DE L L X L DI H L X A-B ≥+0.
2V ≤−0.
2V X OPEN* A H L Z B L H Z RO H L Z H RECEIVER SECTION DS012880-1 L H L X = indeterminate Z ...


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