TLF10408

March 1996

DS3695DS3695TDS3696DS3696TDS3697DS3698

Multipoint RS485RS422 TransceiversRepeaters

General Description

The DS3695 DS3696 DS3697 and DS3698 are high speed

differential TRI-STATE

busline transceiversrepeaters

designed to meet the requirements of EIA standard RS485

multipoint data transmission

The driver and receiver outputs feature TRI-STATE capabili-

ty The driver outputs remain in TRI-STATE over the entire

cause excessive power dissipation within the device trigger

a thermal shutdown circuit which forces the driver outputs

into the high impedance state The DS3696 and DS3698

provide 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 kX 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 475V to 525V supply voltage

range

Features

Y

Meets EIA standard RS485 for multipoint bus transmis-

sion and is compatible with RS-422

Y

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

Y

Y

b

ground difference between devices on the bus

Y

Thermal shutdown protection

Y

High impedance to bus with driver in TRI-STATE or

with power off over the entire common mode range al-

lows the unused devices on the bus to be powered

down

Y

Combined impedance of a driver output and receiver in-

put is less than one RS485 unit load allowing up to 32

transceivers on the bus

Y

70 mV typical receiver hysteresis

Connection and Logic Diagrams

TLF10408 – 1

Top View

TLF10408 – 12

Top View

TLF10408 – 13

Top View

TLF10408 – 14

Top View

Order Number DS3695N DS3696N DS3697N DS3698N

DS3695TN DS3696TN DS3695TJ or DS3696TJ

See NS Package Number J08A or N08E

Note

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

C1996 National Semiconductor Corporation

RRD-B30M76Printed in U S A

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