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DS1487

National Semiconductor
Part Number DS1487
Manufacturer National Semiconductor
Description Low Power RS-485 1/4 Unit Load Multipoint Transceiver
Published Sep 2, 2008
Detailed Description DS1487 Low Power RS-485 January 1997 DS1487 Low Power RS-485 General Description Unit Load Multipoint Transceiver Fea...
Datasheet PDF File DS1487 PDF File

DS1487
DS1487

Overview
DS1487 Low Power RS-485 January 1997 DS1487 Low Power RS-485 General Description Unit Load Multipoint Transceiver Features Y Y Y Y Y Y Y The DS1487 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 presents unit loading to the RS-485 bus allowing up to 128 nodes to be connected together without the use of repeaters The transceiver draws 200 mA of supply current when unloaded or fully loaded with the driver disabled and operates from a single a 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 www.
DataSheet4U.
com (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 logichigh output if the input is open circuit The DS1487 is available in surface mount and DIP packages Y Y Y Y Meets TIA EIA RS-485 multipoint standard Allows up to 128 transceivers on the bus ( U L ) Guaranteed full load output voltage (VOD3) Low quiescent current 200 mA typ b 7V to a 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 Current-limiting and thermal shutdown for driver overload protection Pin and functional compatible with MAX1487 Unit Load Multipoint Transceiver Connection and Logic Diagram DIP and SOIC Truth Table DRIVER SECTION RE X X X DE H H L DI H L X A H L Z B L H Z RECEIVER SECTION RE TL F 12920 – 1 DE L L X L A-B t a 0 2V s b 0 2V RO H L Z H Ord...


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