7 Detailed Description

7.1 Overview

The SNx4AC74 includes two independent D-type flip-flops. Each channel has independent asynchronous preset

(PRE) and clear (CLR) inputs. Each channel has inverted (Q) and non-inverted (Q) outputs.

7.2 Functional Block Diagram

xCLK

C

xD

C

C

C

C

xQ

C

xPRE

xQ

xCLR

C

C

C

C

Figure 7-1. Logic Diagram (Positive Logic) for one channel of SNx4AC74

SN54AC74, SN74AC74

SCAS521H – AUGUST 1995 – REVISED JUNE 2025

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