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PDF DS36276 Data sheet ( Hoja de datos )
| Número de pieza | DS36276 | |
| Descripción | FAILSAFE Multipoint Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 1998
DS36276
FAILSAFE Multipoint Transceiver
General Description
The DS36276 FAILSAFE Multipoint Transceiver is designed
for use on bi-directional differential busses. It is compatible
with existing TIA/EIA-485 transceivers, however, it offers an
additional feature not supported by standard transceivers.
The FAILSAFE feature guarantees the receiver output to a
known state when the Interface is in the following conditions:
Floating Line, Idle Line (no active drivers), and Line Fault
conditions (open or short). The receiver output is in a HIGH
state for the following conditions: OPEN Inputs, Terminated
Inputs (50Ω), and SHORTED Inputs.
FAILSAFE is a highly desirable feature when the transceiv-
ers are used with Asynchronous Controllers such as UARTs.
Features
n FAILSAFE receiver, RO = HIGH for:
— OPEN inputs
— Terminated inputs
— SHORTED inputs
n Compatible with popular interface standards:
— TIA/EIA-485 (RS-485)
— TIA/EIA-422-A (RS-422-A)
— CCITT Recommendation V.11
n Bi-Directional Transceiver
— Designed for multipoint transmission
n Separate driver input, driver enable, receiver enable,
and receiver output for maximum flexibility
n Wide bus common mode range
— (−7V to +12V)
n Pin compatible with: DS75176B, DS96176, DS3695 and
SN75176A and B
n Available in SOIC package
Connection and
Logic Diagram
Truth Tables
Driver
Inputs
RE DE
XH
XH
XL
DI
H
L
X
Outputs
DO/RI
DO /RI
HL
LH
ZZ
DS011383-1
Order Number DS36276M
See NS Package Number M08A
Receiver
Inputs
RE DE
LL
LL
HX
RI–RI
≥0V
≤−500 mV
X
Output
RO
H
L
Z
Receiver FAILSAFE
Inputs
RE DE
RI–RI
L L SHORTED
L L OPEN
HX
X
Output
RO
H
H
Z
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011383
www.national.com
1 page  
Parameter Measurement Information (Continued)
DS011383-6
FIGURE 5. Driver Differential Propagation Delays and Transition Times
DS011383-7
FIGURE 6. Driver Propagation Delay Test Circuit
DS011383-8
FIGURE 7. Driver Propagation Delays
S1 to DO for DI = 3V
S1 to DO for DI = 0V
DS011383-9
FIGURE 8. Driver TRl-STATE Test Circuit (tPZH, tPHZ)
5
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5 Page 
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS36276.PDF ] | |
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