DS3696N National Semiconductor, DS3696N Datasheet

DS3696N

Manufacturer Part Number

DS3696N

Description

Multipoint RS485/RS422 Transceivers/Repeaters

Manufacturer

National Semiconductor

Datasheets

1.DS3696N.pdf (12 pages)

2.DS3695TN.pdf (13 pages)

3.DS3695TN.pdf (12 pages)

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DS3695/DS3695T/DS3696/DS3697

Multipoint RS485/RS422 Transceivers/Repeaters

General Description

The DS3695, DS3696, and DS3697 are high speed differen-

tial TRI-STATE

meet the requirements of EIA standard RS485 with extended

common mode range (+12V to −7V), for multipoint data

transmission.

The driver and receiver outputs feature TRI-STATE capabil-

ity. The driver outputs remain in TRI-STATE over the entire

common mode range of +12V to −7V. Bus faults that cause

excessive power dissipation within the device trigger a ther-

mal shutdown circuit, which forces the driver outputs into the

high impedance state. The DS3696 provides an output pin

TS (thermal shutdown) which reports the occurrence of the

thermal shutdown of the device. This is an “open collector”

pin with an internal 10 k pull-up resistor. This allows the line

fault outputs of several devices to be wire OR-ed.

Both AC and DC specifications are guaranteed over the 0˚C

to 70˚C temperature and 4.75V to 5.25V supply voltage

range.

Connection and Logic Diagrams

Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.

TRI-STATE

is a registered trademark of National Semiconductor Corporation.

bus/line transceivers/repeaters designed to

Top View

DS010408

DS010408-1

DS010408-13

Order Number DS3695N, DS3695TN,

See NS Package Number N08E

DS3696N, or DS3697N

Features

n Meets EIA standard RS485 for multipoint bus

n 15 ns driver propagation delays with 2 ns skew (typical)

n Single +5V supply

n −7V to +12V bus common mode range permits

n Thermal shutdown protection

n High impedance to bus with driver in TRI-STATE or with

n Combined impedance of a driver output and receiver

n 70 mV typical receiver hysteresis

transmission and is compatible with RS-422

ground difference between devices on the bus

power off, over the entire common mode range allows

the unused devices on the bus to be powered down

input is less than one RS485 unit load, allowing up to 32

transceivers on the bus

Top View

DS010408-12

www.national.com

May 1998

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