ST485ABDR 데이터 시트보기 (PDF) - STMicroelectronics

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ST485ABDR

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

STMicroelectronics 

ST485AB

1

Pin configuration

Figure 1. Pin configuration

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

2

RE

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

3

DE

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= 4.75 V to 5.25 V

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