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PDF ST491A Data sheet ( Hoja de datos )
| Número de pieza | ST491A | |
| Descripción | LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ST491A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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ST491A
LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
s LOW SUPPLY CURRENT: 5mA MAX
s DESIGNED FOR RS485 INTERFACE
APPLICATIONS
s -7 TO 12 COMMON MODE INPUT VOLTAGE
RANGE
s 70mV TYPICAL INPUT HYSTERESIS
s DESIGNED FOR 25Mbps OPERATION
s OPERATE FROM SINGLE 5 SUPPLY
s ±4kV ESD PROTECTION
s CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION
DESCRIPTION
The ST491A is a low power transceiver for
RS-485 and RS-422 communications. The device
contains one driver and one receiver in full duplex
configuration. The ST491A draws 5mA (typ.) of
supply current when unloaded and operates from
a single 5V supply.
DIP SOP
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that place the driver
outputs into a high-impedance state. The receiver
input has a fail-safe feature that guarantees a
logic high output if both inputs are open circuit.
ORDERING CODES
Type
ST491ACN
ST491ABN
ST491ACD
ST491ABD
ST491ACDR
ST491ABDR
Temperature
Range
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
Package
DIP-14
DIP-14
SO-14 (Tube)
SO-14 (Tube)
SO-14 (Tape & Reel)
SO-14 (Tape & Reel)
Comments
25parts per tube / 40tube per box
25parts per tube / 40tube per box
50parts per tube / 20tube per box
50parts per tube / 20tube per box
2500 parts per reel
2500 parts per reel
July 2003
1/12
1 page  
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure 1 : Driver DC Test Load
ST491A
Figure 2 : Receiver Timing Test Load
Figure 3 : Driver/Receiver Timing Test Circuit
5/12
5 Page 
DIM.
A
C
D
N
T
Ao
Bo
Ko
Po
P
Tape & Reel SO-14 MECHANICAL DATA
MIN.
12.8
20.2
60
6.4
9
2.1
3.9
7.9
mm.
TYP
MAX.
330
13.2
22.4
6.6
9.2
2.3
4.1
8.1
MIN.
0.504
0.795
2.362
0.252
0.354
0.082
0.153
0.311
inch
TYP.
ST491A
MAX.
12.992
0.519
0.882
0.260
0.362
0.090
0.161
0.319
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ST491A.PDF ] | |
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