ST485A STMicroelectronics, ST485A Datasheet - Page 3

• Manufacturer Part Number: ST485A
• Description: Very high speed low power RS-485/RS-422 transceiver
• Manufacturer: STMicroelectronics

ST485A
1
1.1
Pin configuration
Figure 1.
Pin description
Table 1.
Pin
n°
1
2
3
4
5
6
7
8
Symbol
GND
V
RO
RE
DE
DI
A
B
CC
Pin configuration
Pin description
Receiver output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be
low
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.
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.
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
Ground
Non-inverting receiver input and non-inverting driver output
Inverting receiver input and inverting driver output
Supply voltage: V
CC
= 4.75V to 5.25V
Name and function
Pin configuration
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