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DS3698 Datasheet

  • DS3698

  • Multipoint RS485/RS422 Transceivers/Repeaters

  • 10頁(yè)

  • NSC

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DS3695 DS3695T DS3696 DS3696T DS3697 DS3698
Multipoint RS485 RS422 Transceivers Repeaters
March 1996
DS3695 DS3695T DS3696 DS3696T DS3697 DS3698
Multipoint RS485 RS422 Transceivers Repeaters
General Description
The DS3695 DS3696 DS3697 and DS3698 are high speed
differential TRI-STATE bus line transceivers repeaters
designed to meet the requirements of EIA standard RS485
with extended common mode range (
a
12V to
b
7V) for
multipoint data transmission
The driver and receiver outputs feature TRI-STATE capabili-
ty The driver outputs remain in TRI-STATE over the entire
common mode range of
a
12V to
b
7V Bus faults that
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 鈥樷€榦pen collector鈥欌€?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 4 75V to 5 25V supply voltage
range
Features
Y
Y
Y
Y
Y
Y
Y
Y
Meets EIA standard RS485 for multipoint bus transmis-
sion and is compatible with RS-422
15 ns driver propagation delays with 2 ns skew (typical)
Single
a
5V supply
b
7V to
a
12V bus common mode range permits
g
7V
ground difference between devices on the bus
Thermal shutdown protection
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
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
70 mV typical receiver hysteresis
Connection and Logic Diagrams
TL F 10408 鈥?1
TL F 10408 鈥?12
Top View
Top View
TL F 10408 鈥?13
TL F 10408 鈥?14
Top View
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
C
1996 National Semiconductor Corporation
TL F 10408
RRD-B30M76 Printed in U S A
http
www national com

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