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DS36C278 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DS36C278 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  DS36C278 Low Power Multipoint EIA-RS-485 Transceiver General Description The DS36C278 is a low power differential bus/line trans- ceiver designed to meet the requirements of RS-485 stan- dard for multipoint data transmission. In addition it is com- patible with TIA/EIA-422-B. The CMOS design offers significant power savings over its bipolar and ALS counterparts without sacrificing ruggedness against ESD damage. The device is ideal for use in battery powered or power conscious applications. I CC is specified at 500 µA maximum. The driver and receiver outputs feature TRI-STATE® capa- bility. The driver outputs operate over the entire common mode range of −7V to +12V. Bus contention or fault situa- tions that cause excessive power dissipation within the de- vice are handled by a thermal shutdown circuit, which forces the driver outputs into the high impedance state. The receiver incorporates a fail safe circuit which guarantees a high output state when the inputs are left open. (Note 1) The DS36C278T is fully specified over the industrial tem- perature range (−40˚C to +85˚C). Features n 100% RS-485 compliant — Guaranteed RS-485 device interoperation n Low power CMOS design: I CC 500 µA max n Built-in power up/down glitch-free circuitry — Permits live transceiver insertion/displacement n DIP and SOIC packages available n Industrial temperature range: −40˚C to +85˚C n On-board thermal shutdown circuitry — Prevents damage to the device in the event of excessive power dissipation n Wide common mode range: −7V to +12V n Receiver open input fail-safe (Note 1) n 1 ⁄4 unit load (DS36C278): ≥128 nodes n 1 ⁄2 unit load (DS36C278T): ≥64 nodes n ESD (human body model): ≥2kV n Drop in replacement for: — LTC485, MAX485, DS75176, DS3695 Connection Diagram 01204001 Order Number DS36C278TM, DS36C278TN, DS36C278M, DS36C278N See NS Package Number M08A or N08E Truth Table DRIVER SECTION RE* DE DI DO/RI DO*/RI* XH H H L XH L L H XL X Z Z RECEIVER SECTION RE* DE RI-RI* RO LL ≥+0.2V H LL ≤−0.2V L HL X Z L L OPEN (Note 1) H Note 1: Non-terminated, open input only TRI-STATE® is a registered trademark of National Semiconductor Corporation. July 1998 © 2004 National Semiconductor Corporation DS012040 www.national.com |
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