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DS3695TN Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer DS3695TN
Beschreibung Multipoint RS485/RS422 Transceivers/Repeaters
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
DS3695TN Datasheet, Funktion
May 1998
DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
The DS3695, DS3696, and DS3697 are high speed differen-
tial TRI-STATE® bus/line transceivers/repeaters designed to
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 kpull-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.
Features
n Meets EIA standard RS485 for multipoint bus
transmission and is compatible with RS-422
n 15 ns driver propagation delays with 2 ns skew (typical)
n Single +5V supply
n −7V to +12V bus common mode range permits ±7V
ground difference between devices on the bus
n Thermal shutdown protection
n High impedance to bus with driver in TRI-STATE or with
power off, over the entire common mode range allows
the unused devices on the bus to be powered down
n Combined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
n 70 mV typical receiver hysteresis
Connection and Logic Diagrams
Top View
DS010408-1
Top View
DS010408-12
Top View
DS010408-13
Order Number DS3695N, DS3695TN,
DS3696N, or DS3697N
See NS Package Number N08E
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.
© 1998 National Semiconductor Corporation DS010408
www.national.com






DS3695TN Datasheet, Funktion
Function Tables
DS3695/DS3696 Transmitting
Inputs
RE DE
X1
X1
X0
X1
DI
1
0
X
X
Thermal
Shutdown
OFF
OFF
OFF
ON
DO
0
1
Z
Z
Outputs
DO TS *
(DS3696 Only)
1H
0H
ZH
ZL
DS3695/DS3696 Receiving
Inputs
RE DE
00
00
10
RI–RI
+0.2V
−0.2V
X
Outputs
RO TS *
(DS3696 Only)
1H
0H
ZH
DS3697
Inputs
E RI-RI
Thermal
Shutdown
DO
DO
1 +0.2V
1 −0.2V
0X
1 +0.2V
1 −0.2V
OFF
OFF
OFF
ON
ON
01
10
ZZ
ZZ
ZZ
Outputs
RO
(DS3697 Only)
1
0
Z
1
0
X — Don’t care condition
Z — High impedance state
*TS is an “open collector” output with an on-chip 10 kpull-up resistor that reports the occurrence of a thermal shutdown of the device.
Typical Application
Note: Repeater control logic not shown, see AN-702.
www.national.com
6
DS010408-11

6 Page









DS3695TN pdf, datenblatt
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Molded Dual-In-Line Package (N)
Order Number DS3695N, DS3696N, DS3697N, or DS3695TN
NS Package Number N08E
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. Life support devices or systems are devices or sys- 2. A critical component in any component of a life support
tems which, (a) are intended for surgical implant into
device or system whose failure to perform can be rea-
the body, or (b) support or sustain life, and whose fail-
sonably expected to cause the failure of the life support
ure to perform when properly used in accordance
device or system, or to affect its safety or effectiveness.
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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Tel: 1-800-272-9959
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