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PDF ST485A Data sheet ( Hoja de datos )
| Número de pieza | ST485A | |
| Descripción | Very high speed low power RS-485/RS-422 transceiver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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ST485A
Very high speed
low power RS-485/RS-422 transceiver
General features
s Low supply current: 5mA max
s High data rate > 30Mbps
s Designed for RS 485 interface applications
s -7 to 12 common mode input voltage range
s Driver maintains high impedance in 3-state or
with the power off
s 70mV typical input hysteresis
s Operate from single 5 supply
s ±4kV ESD protection
s Current limiting and thermal shutdown for
driver overload protection
s Latch-up free up to 500mA
Description
The ST485A is a low power, high speed
transceiver for RS-485 and RS-422
communications. The device contains one driver
and one receiver in half duplex configuration. The
ST485A draws 3mA (typ.) of supply current when
unloaded or fully loaded with disabled drivers. It
operates from a single 5V supply.
DIP-8
SO-8
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.
The ST485A is designed for bi-directional data
communications or multipoint bus transmission
lines.
Order code
Part number Temperature range
ST485ACN
ST485ABN
ST485ACDR
0 to 70 °C
-40 to 85 °C
0 to 70 °C
ST485ABDR
-40 to 85 °C
March 2006
Package
DIP-8
DIP-8
SO-8 (Tape & reel)
SO-8 (Tape & reel)
Rev 2
Comments
50parts per tube / 40tube per box
50parts per tube / 40tube per box
2500 parts per reel
2500 parts per ree
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www.st.com
19
1 page  
ST485A
3 Maximum ratings
Maximum ratings
Table 4. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VCC Supply voltage
VI Control input voltage (RE, DE)
VDI Driver input voltage (DI)
VDO Driver output voltage (A, B)
VRI Receiver input voltage (A, B)
VRO Receiver output voltage (RO)
7
-0.3 to 7
-0.3 to 7
-7.5 to 12.5
-7.5 to 12.5
-0.3 to (VCC + 0.3)
V
V
V
V
V
V
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
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5 Page 
ST485A
Figure 8. Receiver propagation delay
Test circuit and typical characteristics
Figure 9. Receiver enable and disable time
11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ST485A.PDF ] | |
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