3 Pin Configuration and Functions

1

2

3

7

4

5

6

14

13

12

8

11

18

17

GND

1Y2

1Y3

2A2

V

CC

15

16

1A1

2Y4

1OE

1A3

2Y2

2A1

2A3

1Y4

2Y3

1A2

10

9

1A4

2Y1

1Y1

2OE

2A4

20

19

J, DGS, DW, N, NS, or PW package

20-Pin CDIP, SOIC, PDIP, NS, or TSSOP

Top View

FK Package

20-Pin LCCC

Top View

NAME(1)

PIN

TYPE

DESCRIPTION

1OE

1

I

Output enable 1

1A1

2

I

1A1 input

2Y4

3

O

2Y4 output

1A2

4

I

1A2 input

2Y3

5

O

2Y3 output

1A3

6

I

1A3 input

2Y2

7

O

2Y2 output

1A4

8

I

1A4 input

2Y1

9

O

2Y1 output

GND

10

—

Ground pin

2A1

11

I

2A1 input

1Y4

12

O

1Y4 output

2A2

13

I

2A2 input

1Y3

14

O

1Y3 output

2A3

15

I

2A3 input

1Y2

16

O

1Y2 output

2A4

17

I

2A4 input

1Y1

18

O

1Y1 output

2OE

19

I

Output enable 2

VCC

20

—

Power pin

(1)

I = input, O = output, P = power, FB = feedback, GND = ground, N/A = not applicable

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SN54HCT240, SN74HCT240

SCLS174H – MARCH 1984 – REVISED AUGUST 2024

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3

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