DS3696AM National Semiconductor, DS3696AM Datasheet

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DS3696AM

Manufacturer Part Number
DS3696AM
Description
Multipoint RS485/RS422 Transceivers
Manufacturer
National Semiconductor
Datasheet

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© 1998 National Semiconductor Corporation
DS3695A/DS3695AT/DS3696A
Multipoint RS485/RS422 Transceivers
General Description
The DS3695A and DS3696A are high speed differential
TRI-STATE
quirements of EIA standard RS485 with extended common
mode range (+12V to −7V), for multipoint data transmission.
In addition they are compatible with requirements of RS-422.
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 DS3696A provides an output pin
(TS) which reports the thermal shutdown of the device. TS is
an “open collector” pin with an internal 10 k pull-up resistor.
This allows the TS 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 Diagram
TS was LF (Line Fault) on previous datasheets, TS goes low upon thermal shutdown.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
®
bus/line transceivers designed to meet the re-
Order Number DS3695AM, DS3695ATM or DS3696AM
DS005272
Molded Package, Small Outline (M)
See NS Package Number M08A
Top View
Top View
Features
n Meets EIA standard RS485 for multipoint bus
n 10 ns driver propagation delays (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
n Available in SOIC packaging
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
DS005272-1
DS005272-2
February 1996
www.national.com
±
7V

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DS3696AM Summary of contents

Page 1

... Connection and Logic Diagram TS was LF (Line Fault) on previous datasheets, TS goes low upon thermal shutdown. Order Number DS3695AM, DS3695ATM or DS3696AM TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation ...

Page 2

... Recommended Operating Conditions 7V 7V Supply Voltage Bus Voltage +15V/−10V Operating Free Air Temp. (T +15V/−10V Commercial (DS3695AM) 5.5V Industrial (DS3695ATM) Commercial (DS3696AM) 630 mW (Note 4) −65˚C to +150˚C (Notes 2, 3) Conditions (RS-422) (Note (RS-485 DI − ...

Page 3

Electrical Characteristics Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: All typicals are given for and ...

Page 4

AC Test Circuits and Switching Waveforms Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V FIGURE 2. Receiver Input-to-Output Propagation Delay Timing FIGURE 3. Receiver Enable/Disable Propagation Delay Timing Unless otherwise specified the ...

Page 5

AC Test Circuits and Switching Waveforms FIGURE 6. Driver Enable/Disable Propagation Delay Timing FIGURE 7. Driver Differential Transition Timing Function Tables DS3695A/DS3696A Transmitting Inputs DS3695A/DS3696A ...

Page 6

Typical Application Repeater control logic not shown. See AN-702. www.national.com DS005272-18 6 ...

Page 7

7 ...

Page 8

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS3695AM, DS3695ATM or DS3696AM LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1 ...

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