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PDF DS3698 Data sheet ( Hoja de datos )
| Número de pieza | DS3698 | |
| Descripción | Multipoint RS485/RS422 Transceivers/Repeaters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS3698 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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March 1996
DS3695 DS3695T DS3696 DS3696T DS3697 DS3698
Multipoint RS485 RS422 Transceivers Repeaters
www.DataSheet4U.com
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 (a12V to b7V) 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 a12V to b7V 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 ‘‘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 4 75V to 5 25V 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 Single a5V supply
Y b7V to a12V bus common mode range permits g7V
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
Top View
TL F 10408 – 1
Top View
TL F 10408 – 12
Top View
TL F 10408 – 13
TL F 10408 – 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 TL F 10408
RRD-B30M76 Printed in U S A
http www national com
1 page  
AC Test Circuits and Switching Waveforms (Continued)
TL F 10408 – 6
Note Unless otherwise specified the switches are closed
FIGURE 5 Driver Propagation Delay and Transition Time Test Circuits
www.DataSheet4U.com
TL F 10408 – 7
TL F 10408 – 8
Note tPLH and tPHL are measured to the respective 50% points tSKEW is the difference between propagation delays of the complementary outputs
FIGURE 6 Driver Input-to-Output Propagation Delay Timing (Single-Ended)
FIGURE 7 Driver Enable Disable Propagation Delay Timing
TL F 10408 – 9
FIGURE 8 Driver Differential Transition Timing
TL F 10408 – 10
5 http www national com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS3698.PDF ] | |
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