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ST3485ECDR Datasheet(PDF) 2 Page - STMicroelectronics

Part # ST3485ECDR
Description  3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST3485ECDR Datasheet(HTML) 2 Page - STMicroelectronics

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ST3485E
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PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER)
X= Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER)
X= Don’t Care; Z=High Impedance
PlN N°
SYMBOL
NAME AND FUNCTION
1RO
Receiver Output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be
low
2RE
Receiver Output Enable. RO is enabled when RE is low; RO is high impedance
when RE is high. If RE is high and DE is low, the device will enter a low power
shutdown mode.
3DE
Driver Output Enable. The driver outputs are enabled by bringing DE high. They
are high impedance when DE is low. If RE is high DE is low, the device will enter a
low-power shutdown mode. If the driver outputs are enabled, the part functions as
line driver, while they are high impedance, it functions as line receivers if RE is
low.
4DI
Driver Input. A low on DI forces output A low and output B high. Similarly, a high
on DI forces output A high and output B low
5
GND
Ground
6
A
Non-inverting Receiver Input and Non-inverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output
8
VCC
Supply Voltage: VCC= 3V to 3.6V
INPUTS
OUTPUTS
MODE
RE
DE
DI
B
A
X
H
H
L
H
Normal
X
H
L
H
L
Normal
L
L
X
Z
Z
Normal
H
L
X
Z
Z
Shutdown
INPUTS
OUTPUT
MODE
RE DE
A-B
RO
LL
≥ -0.015V
H
Normal
LL
≤ -0.2V
L
Normal
L
L
Inputs Open
H
Normal
L
L
Inputs Shorted
H
Normal
H
L
X
Z
Shutdown


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