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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet

Rev. 03 — 12 November 2004

3 of 19

Philips Semiconductors

74HC237

3-to-8 line decoder, demultiplexer with address latches

5.

Functional diagram

Fig 1.

Functional diagram

Fig 2.

Logic symbol

Fig 3.

IEC logic symbol

001aab871

Y0

Y1

Y2

3 TO 8

DECODER

INPUT

LATCHES

Y3

Y4

Y5

Y6

Y7 7

9

10

11

12

13

14

15

A0

A1

E1

E2

A2

LE

4

3

5

6

2

1

001aab869

Y0

Y1

Y2

3 TO 8

DECODER

INPUT

LATCHES

Y3

Y4

Y5

Y6

Y7

7

9

10

11

12

13

14

15

A0

A1

E1

E2

5

6

A2

LE

4

3

2

1

001aab870

0

1

2

3

4

5

6

7

7

9

10

11

12

13

14

15

C8

8D,1

8D,2

X/Y

EN

&

2

8D,4

3

5

6

1

4

0

1

2

3

4

5

6

7

7

9

10

11

12

13

14

15

C8

0

8D,G

0

7

DX

&

2

2

3

5

6

1

4