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ST485ACN

Very high speed low power RS-485/RS-422 transceiver

STMicroelectronics 

ST485A

1

Pin configuration

Figure 1. Pin configuration

Pin configuration

1.1

Pin description

Table 1. Pin description

Pin

n°

Symbol

Name and function

1

RO

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

2

RE 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

3

DE

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.

4

DI

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= 4.75V to 5.25V

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