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PDF ST485 Data sheet ( Hoja de datos )
| Número de pieza | ST485 | |
| Descripción | Low power RS-485/RS-422 transceiver | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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ST485
Low power
RS-485/RS-422 transceiver
General features
I Low quiescent current: 300mA
I Designed for RS-485 interface application
I -7V to 12V common mode input voltage range
I Driver maintains high impedance in 3-state or
with the power OFF
I 70mV tipycal input hysteresis
I 30ns propagation delay, 5ns skew
I Operate from a single 5V supply
I Current limiting and thermal shutdown for
driver overload protection
I 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 300mA (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 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 applciations).
The ST485 is available in three temperature
range: commercial (0°C to 70°C), industrial (-
40°C to 850°C) and automotive (-55°C to 125°C)
Order code
Part number Temperature range
ST485CN
ST485BN
ST485XN
ST485CD
ST485BD
ST485CDR
ST485BDR
ST485XDR
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
-55 to 125 °C
Package
DIP-8
DIP-8
DIP-8
SO-8 (Tube)
SO-8 (Tube)
SO-8 (Tape & reel)
SO-8 (Tape & reel)
SO-8 (Tape & reel)
Comments
50parts per tube / 40tube per box
50parts per tube / 40tube per box
50parts per tube / 40tube per box
100parts per tube / 20tube per box
100parts per tube / 20tube per box
2500 parts per reel
2500 parts per reel
2500 parts per reel
March 2006
Rev 12
1/19
www.st.com
19
1 page  
ST485
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
-0.5 to (VCC + 0.5)
-0.5 to (VCC + 0.5)
± 14
± 14
-0.5 to (VCC + 0.5)
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. V+ and V- can have a maximum
magnitude of +7V, but their absolute addition can not exceed 13 V.
5/19
5 Page 
ST485
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 ST485.PDF ] | |
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