st485ab STMicroelectronics, st485ab Datasheet - Page 3

• Manufacturer Part Number: st485ab
• Description: Very High Speed Low Power Rs-485/rs-422 Transceiver
• Manufacturer: STMicroelectronics

1
Figure 1.
Table 2.
Pin n°
1
2
3
4
5
6
7
8
Symbol
GND
V
RO
RE
DE
DI
A
B
CC
Pin configuration
Pin configuration
Pin description
Receiver output. If A>B by 200 mV, RO will be high; if A<B by 200 mV, 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
= 4.75 V to 5.25 V
Name and function
3/19