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MC74HCT138A

1-of-8 Decoder/Demultiplexer with LSTTL Compatible Inputs

ON Semiconductor 

MC74HCT138A

EXPANDED LOGIC DIAGRAM

A0 1

A1 2

A2 3

CS3 5

CS2 4

CS1 6

15 Y0

14 Y1

13 Y2

12 Y3

11 Y4

10 Y5

9 Y6

7 Y7

INPUT A

tPLH

OUTPUT Y

SWITCHING WAVEFORMS

VALID

1.3 V

1.3 V

VALID

tPHL

tr

3V

INPUT CS1

2.7 V

1.3 V

0.3 V

GND

tPHL

OUTPUT Y

90%

1.3 V

10%

tTHL

Figure 1.

Figure 2.

tf

3V

GND

tPLH

tTLH

tr

INPUT

CS2, CS3

2.7 V

1.3 V

0.3 V

tPHL

OUTPUT Y

90%

1.3 V

10%

tTHL

Figure 3.

tf

3V

GND

tPLH

tTLH

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