6 Detailed Description

6.1 Overview

The 'AC245 and 'ACT245 are non-inverting three-state bidirectional transceiver-buffers intended for two-way

transmission from “A” bus to “B” bus or “B” bus to “A”. The logic level present on the direction input

(DIR) determines the data direction. When the output enable input (OE) is HIGH, the outputs are in the

high-impedance state.

6.2 Functional Block Diagram

Logic Diagram (Positive Logic)

6.3 Device Functional Modes

Function Table lists the function modes of the CDx4AC245, CDx4ACT245.

Table 6-1. Function Table

INPUTS(1)

OPERATION

OE

DIR

L

L

B data to A bus

L

H

A data to B bus

H

X

Isolation

(1)

H = High Voltage Level, L =

Low Voltage Level, X = Don’t

Care

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CD54AC245, CD74AC245, CD54ACT245, CD74ACT245

SCHS245D – NOVEMBER 1998 – REVISED APRIL 2024

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Product Folder Links: CD54AC245 CD74AC245 CD54ACT245 CD74ACT245