1FEATURES

2? FAILSAFE Receiver, RO = HIGH for:

– OPEN Inputs

– Terminated Inputs

– SHORTED Inputs

? Optimal for Use in SAE J1708 Interfaces

? Compatible with Popular Interface Standards:

– TIA/EIA-485 and TIA/EIA-422-A

– CCITT Recommendation V.11

? Bi-Directional Transceiver

– Designed for Multipoint Transmission

? Wide Bus Common Mode Range

– (?7V to +12V)

? Available in PDIP and SOIC Packages

DESCRIPTION

The DS36277 Dominant Mode Multipoint Transceiver

is designed for use on bi-directional differential

busses. It is optimal 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 disabled, the

bus is pulled HIGH by external bias resistors.

The receiver provides a FAILSAFE feature that

ensures 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 (50Ω), or

Shorted Inputs. FAILSAFE is a highly desirable

feature when the transceivers are used with

Asynchronous Controllers such as UARTs.