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

Product data sheet

Rev. 03 — 12 November 2004

13 of 19

Philips Semiconductors

74HC237

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

13. Application information

Test data is given in Table 9.

Definitions for test circuit:

Fig 9.

Load circuitry for switching times

Table 9:

Test data

Supply

Input

Load

2.0 V

6 ns

50 pF

4.5 V

6 ns

50 pF

6.0 V

6 ns

50 pF

5.0 V

6 ns

15 pF

mna101

PULSE

GENERATOR

D.U.T.

Fig 10. 6-to-64 line decoder with input address storage

001aab876

16

237

outputs

to five

other

decoders

17 18 19 20 21 22 23

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

LE

A2 A1 A0

E1 E2

8

237

outputs

9

10 11 12 13 14 15

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

LE

A2 A1 A0

E1 E2

0

237

outputs

1

2

3

4

5

6

7

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

LE

A2 A1 A0

E1 E2

0

237

12

3

4

5

6

7

Y0

X0

decoder enable

input

address

strobe

X1

X2

X3

X4

X5

Y1 Y2 Y3 Y4 Y5 Y6 Y7

LE

A2 A1 A0

E1 E2