ST485AB

Pin configuration

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1

Pin configuration

Figure 1.

Pin configuration

Table 2.

Pin description

Pin n°

Symbol

Name and function

1

RO

Receiver output. If A>B by 200 mV, RO will be high; if A<B by 200 mV, 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