MC74HCT157AD datasheet(4/5 Pages) MOTOROLA

Part #	MC74HCT157AD

Description	Quad 2-Input Data Selector/Multiplexer with LSTTL-Compatible Inputs

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Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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4 / 5 page

MC74HCT157A

MOTOROLA

High–Speed CMOS Logic Data

DL129 — Rev 6

4

INPUT A OR B

Figure 1.

Figure 2.

OUTPUT ENABLE

tPLH

tPHL

tr

tf

VCC

GND

tTHL

tTLH

10%

90%

Figure 3.

OUTPUT Y

SWITCHING WAVEFORMS

* Includes all probe and jig capacitance

CL*

TEST POINT

DEVICE

UNDER

TEST

OUTPUT

Figure 4. Test Circuit

tr

tf

3 V

GND

OUTPUT Y

tPHL

tPLH

0.3 V

1.3 V

2.7 V

90%

tTLH

tTHL

tr

tf

3 V

GND

SELECT

OUTPUT Y

tPHL

tPLH

tTLH

tTHL

10%

90%

EXPANDED LOGIC DIAGRAM

4

7

9

12

2

3

5

6

11

10

14

13

A0

B0

A1

B1

A2

B2

A3

B3

Y0

Y1

Y2

Y3

OUTPUT ENABLE

SELECT

DATA

OUTPUTS

NIBBLE

INPUTS

10%

1.3 V

0.3 V

1.3 V

2.7 V

1.3 V

0.3 V

1.3 V

2.7 V

1.3 V

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MC74HCT157AD Datasheet(PDF) 4 Page - Motorola, Inc

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