DS36277TMX National Semiconductor Corporation, DS36277TMX Datasheet

DS36277TMX

Manufacturer Part Number

DS36277TMX

Description

DS36277 - Dominant Mode Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8

Manufacturer

National Semiconductor Corporation

Datasheet

1.DS36277TMX.pdf (12 pages)

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DS36277

Dominant Mode Multipoint Transceiver

General Description

The DS36277 Dominant Mode Multipoint Transceiver is de-

signed for use on bi-directional differential busses. It is opti-

mal for use on Interfaces that utilize Society of Automotive

Engineers (SAE) J1708 Electrical Standard.

The device is similar to standard TIA/EIA-485 transceivers,

but differs in enabling scheme. The Driver’s Input is normally

externally tied LOW, thus providing only two states: Active

(LOW), or Disabled (OFF). When the driver is active, the

dominant mode is LOW, conversely, when the driver is dis-

abled, the bus is pulled HIGH by external bias resistors.

The receiver provides a FAILSAFE feature that guarantees a

known output state when the Interface is in the following

conditions: Floating Line, Idle Line (no active drivers), and

Line Fault Conditions (open or short). The receiver output is

HIGH for the following conditions: Open Inputs, Terminated

Inputs (50 ), or Shorted Inputs. FAILSAFE is a highly desir-

able feature when the transceivers are used with Asynchro-

nous Controllers such as UARTs.

Connection and Logic Diagram

TRI-STATE

Order Number DS36277TM or DS36277TN

See NS Package Number M08A or N08E

is a registered trademark of National Semiconductor Corporation.

DS011384-1

DS011384

Features

n FAILSAFE receiver, RO = HIGH for:

n Optimal for use in SAE J1708 Interfaces

n Compatible with popular interface standards:

n Bi-directional transceiver

n Wide bus common mode range

n Available in plastic DIP and SOIC packages

Driver

Receiver

— OPEN inputs

— Terminated inputs

— SHORTED inputs

— TIA/EIA-485 and TIA/EIA-422-A

— CCITT recommendation V.11

— Designed for multipoint transmission

— (−7V to +12V)

Inputs

DO/RI–DO /RI

SHORTED

−500 mV

OPEN

0 mV

DO/RI

Outputs

February 2002

www.national.com

Output

DO /RI

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