8 Detailed Description

8.1 Overview

The SN74HCS151-Q1 is a high speed silicon gate CMOS multiplexer well suited to multiplexing and data routing

applications. It contains a single 8:1 multiplexer.

The SN74HCS151-Q1 operates asynchronously, with the Y output being equal to the input selected by the

address inputs (A, B, C). The W output is always the inverse of the Y output.

The strobe (G) input forces the Y output low, and the W output high, regardless of the state of other inputs.

All inputs include Schmitt-triggers allowing for slow input transitions and providing additional noise margin.

8.2 Functional Block Diagram

000

001

010

011

100

101

110

111

A

B

C

CBA

D0

D1

D2

D3

D4

D5

D6

D7

Y

W

G

Figure 8-1. Logic Diagram (Positive Logic) for SN74HCS151-Q1

8.3 Feature Description

8.3.1 Balanced CMOS Push-Pull Outputs

This device includes balanced CMOS push-pull outputs. The term balanced indicates that the device can sink

and source similar currents. The drive capability of this device may create fast edges into light loads so routing

and load conditions should be considered to prevent ringing. Additionally, the outputs of this device are capable

of driving larger currents than the device can sustain without being damaged. It is important for the output power

of the device to be limited to avoid damage due to overcurrent. The electrical and thermal limits defined in the

Absolute Maximum Ratings must be followed at all times.

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SN74HCS151-Q1

SCLS819B – AUGUST 2020 – REVISED DECEMBER 2021

Copyright © 2021 Texas Instruments Incorporated

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