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PDF ST485EC Data sheet ( Hoja de datos )
| Número de pieza | ST485EC | |
| Descripción | RS-485/RS-422 transceiver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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ST485EB
ST485EC - ST485EX
±15 kV ESD protected, 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
■ Operates from a single 5 V supply
■ Current limiting and thermal shutdown for
driver overload protection
■ ESD protection:
– ± 15 kV (HBM)
– ± 8 kV (IEC-1000-4-2 contact discharge)
■ Allows up to 256 transceivers on the bus
Description
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 ST485E is designed for bi-directional data
communications on multipoint bus transmission
lines (half-duplex applications).
The ST485E is a low power transceiver for RS-
485 and RS-422 communication. Each driver
output and receiver input is protected against
± 15 kV electrostatic discharge (HBM) (ESD)
shocks, without latch-up. These parts contain one
driver and one receiver in half duplex
configuration.
This transceiver draws 300 µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5 V supply.
Table 1. Device summary
Order codes
Temperature
range
Package
Packaging
ST485EBD
ST485ECDR
ST485EBDR
ST485EXDR
- 40 to 85 °C
0 to 70 °C
- 40 to 85 °C
- 55 to 125 °C
SO-8 (tube)
SO-8 (tape and reel)
SO-8 (tape and reel)
SO-8 (tape and reel)
100 parts per tube / 20 tube per box
2500 parts per reel
2500 parts per reel
2500 parts per reel
February 2009
Rev 14
1/18
www.st.com
18
1 page  
ST485EB - ST485EC - ST485EX
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 is not implied.
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ST485EB - ST485EC - ST485EX
Figure 8. Receiver propagation delay
Test circuit and typical characteristics
Figure 9. Receiver enable and disable time
11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ST485EC.PDF ] | |
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