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( File format: PDF, 566 Kbytes )
Slew Rate Controlled CMOS TIA/EIA-485 Transceiver
National Semiconductor

Description
The DS36C280 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 slew rate control feature allows the user to set the driver rise and fall times by using an external resistor. Controlled edge rates can reduce switching EMI. 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 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 .
Features

???100% RS-485 compliant
???Guaranteed RS-485 device interoperation
???Low power CMOS design: ICC 500 ?A max
???Adjustable slew rate control
???Minimizes EMI affects
???Built-in power up/down glitch-free circuitry
???Permits live transceiver insertion/displacement
???SOIC packages
???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 (DS36C280): >=128 nodes
???? unit load (DS36C280T): >=64 nodes
???ESD (human body model): >=2 kV




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