DS485 Datasheet | National Semiconductor

Description The DS485 is a low-power transceiver for RS-485 and RS-422 munication. 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 mon 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 mercial 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 mon-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 patible 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 X = indeterminate Z = TRI-STATE Order Number DS485N DS485M DS485TN DS485TM Temp. Range 0˚C to +70˚C 0˚C to +70˚C - 40˚C to +85˚C - 40˚C to +85˚C Package/###...