9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Application Information

The SN74HCS151 is an 8-to-1 data selector/multiplexer. This application shows an example of using the device

with all required connections.

9.2 Typical Application

System

Controller

3:8

DECODER

A

B

C

G

GND

8:1

Multiplexer

D1

D2

D0

D4

D5

D3

D6

D7

Device 0

Device 1

Device 2

Device 3

Device 4

Device 5

Device 6

Device 7

Y

VCC

0.1…F

W

VCC

Figure 9-1. Typical application block diagram

9.2.1 Design Requirements

9.2.1.1 Power Considerations

Ensure the desired supply voltage is within the range specified in the Recommended Operating Conditions. The

supply voltage sets the device's electrical characteristics as described in the Electrical Characteristics.

The positive voltage supply must be capable of sourcing current equal to the total current to be sourced by all

outputs of the SN74HCS151 plus the maximum static supply current, ICC, listed in Electrical Characteristics and

any transient current required for switching. The logic device can only source as much current as is provided by

the positive supply source. Be sure not to exceed the maximum total current through VCC listed in the Absolute

Maximum Ratings.

The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the

SN74HCS151 plus the maximum supply current, I CC, listed in Electrical Characteristics, and any transient

current required for switching. The logic device can only sink as much current as can be sunk into its ground

connection. Be sure not to exceed the maximum total current through GND listed in the Absolute Maximum

Ratings.

The SN74HCS151 can drive a load with a total capacitance less than or equal to 50 pF while still meeting all of

the datasheet specifications. Larger capacitive loads can be applied, however it is not recommended to exceed

50 pF.

The SN74HCS151 can drive a load with total resistance described by RL ≥ VO / IO, with the output voltage and

current defined in the Electrical Characteristics table with VOH and VOL. When outputting in the high state, the

output voltage in the equation is defined as the difference between the measured output voltage and the supply

voltage at the VCC pin.

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SN74HCS151

SCLS845A – SEPTEMBER 2020 – REVISED OCTOBER 2020

Copyright © 2020 Texas Instruments Incorporated

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