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( File format: PDF, 583 Kbytes )
Low Power Multipoint TIA/EIA-485 Transceiver
National Semiconductor

Description
The DS36C278 is a low power differential bus/line transceiver designed to meet the requirements of RS-485 standard for multipoint data transmission. In addition it is compatible 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. ICC is specified at 500 ?A maximum. The driver and receiver outputs feature TRI-STATE? capability. The driver outputs operate over the entire common mode range of -7V to +12V. Bus contention or fault situations that cause excessive power dissipation within the device 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. The DS36C278T is fully specified over the industrial temperature range (-40C to +85C).
Features

???100% RS-485 compliant
???Guaranteed RS-485 device interoperation
???Low power CMOS design: ICC 500 ?A max
???Built-in power up/down glitch-free circuitry
???Permits live transceiver insertion/displacement
???DIP and SOIC packages available
???Industrial temperature range: -40C to +85C
???On-board thermal shutdown circuitry
???Prevents damage to the device in the event of excessive power dissipation
???Wide common mode range: -7V to +12V
???Receiver open input fail-safe
???? unit load (DS36C278): >=128 nodes
???? unit load (DS36C278T): >=64 nodes
???ESD (human body model): >=2 kV
???Drop in replacement for:
???LTC485, MAX485, DS75176, DS3695




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