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Part Number: DS36C278

 

 

Package Cooled: SOP-8

 

Description: The DS36C278 is a low power differential bus/line trans-ceiver designed to meet the requirements of RS-485 stan-dard fo...


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DS36C278 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 andALS 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 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 to +85).

DS36C278 Maximum Ratings

If Military/Aerospace specified devices are required,pleasecontacttheNationalSemiconductorSalesOffice/Distributors for availability and specifications.
Supply Voltage (VCC)                                                                                       +12V
Input Voltage (DE, RE*, & DI)                                                   -0.5V to (VCC+0.5V)
Common Mode (VCM)Driver Output/Receiver Input                                         ±15V
Input Voltage (DO/RI, DO*/RI*)                                                                      ±14V
Receiver Output Voltage                                                            -0.5V to (VCC+0.5V)
Maximum Package Power Dissipation@ +25
M Package 1190 mW, derate 9.5 mW/above                                                +25
N Package 744 mW, derate 6.0 mW/above                                                  +25
Storage Temperature Range                                                             -65to +150
Lead Temperature(Soldering 4 sec)                                                               +260

DS36C278 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: -40 to +85
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 (Note 1)
1/4 unit load (DS36C278): 128 nodes
1/2 unit load (DS36C278T): 64 nodes
ESD (human body model): 2kV
Drop in replacement for:
- LTC485, MAX485, DS75176, DS3695

DS36C278 Connection Diagram

DS36C278 Connection Diagram

DS36C278 datasheet

DS36C278
PDF/DataSheet Download

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