6 Detailed Description

6.1 Overview

The CD74ACT157 features a common strobe (G) input. When the strobe is high, all outputs are low. When the

strobe is low, a 4-bit word is selected from one of two sources and is routed to the four outputs. The device

provides true data.

6.2 Functional Block Diagram

Figure 6-1. Logic Diagram (Positive Logic)

6.3 Device Functional Modes

Table 6-1. Function Table

INPUTS

OUTPUT

G

A/B

A

B

Y

H

X

X

X

L

L

L

L

X

L

L

L

H

X

H

L

H

X

L

L

L

H

X

H

H

CD74ACT157

SCHS340C – MARCH 2003 – REVISED AUGUST 2024

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