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PDF ST485B Data sheet ( Hoja de datos )
| Número de pieza | ST485B | |
| Descripción | Low power RS-485/RS-422 transceiver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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ST485B
ST485C
Low power RS-485/RS-422 transceiver
Features
■ Low quiescent current: 300 µA
■ Designed for RS-485 interface application
■ - 7 V to 12 V common mode input voltage range
■ Driver maintains high impedance in 3-state or
with the power OFF
■ 70 mV typical input hysteresis
■ 30 ns propagation delay, 5 ns skew
■ Operate from a single 5 V supply
■ Current limiting and thermal shutdown for
driver overload protection
■ Allows up to 64 transceivers on the bus
Description
The ST485 is al low power transceiver for RS-485
and RS-422 communication. Each part contains
one driver and one receiver.
This transceiver draw 300 µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5 V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that placed the driver
outputs into a high-impedance state.
The ST485 is designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applications).
DIP-8
SO-8
The ST485 is available in three temperature
range: commercial (0 °C to 70 °C), industrial (- 40
°C to 85 °C) and automotive (- 55 °C to 125 °C).
Table 1. Device summary
Order code Temperature range
ST485CN
0 to 70 °C
ST485BN
- 40 to 85 °C
ST485CDR
ST485BDR
0 to 70 °C
- 40 to 85 °C
Package
DIP-8
DIP-8
SO-8 (tape and reel)
SO-8 (tape and reel)
Packaging
50 parts per tube / 40 tube per box
50 parts per tube / 40 tube per box
2500 parts per reel
2500 parts per reel
February 2009
Rev 16
1/19
www.st.com
19
1 page  
ST485B - ST485C
3 Maximum ratings
Maximum ratings
Table 5. Absolute maximum ratings
Symbol
Parameter
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)
Value
7
-0.5 to (VCC + 0.5)
-0.5 to (VCC + 0.5)
± 14
± 14
-0.5 to (VCC + 0.5)
Unit
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.
5/19
5 Page 
ST485B - ST485C
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 ST485B.PDF ] | |
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