74HC237N datasheet(13/19 Pages) PHILIPS

13 / 19 page

9397 750 13807

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:

RT = Termination resistance should be equal to output impedance Zo of the pulse generator.

CL = Load capacitance including jig and probe capacitance.

Fig 9.

Load circuitry for switching times

Table 9:

Test data

Supply

Input

Load

VCC

tr, tf

2.0 V

VCC

6 ns

50 pF

4.5 V

VCC

6 ns

50 pF

6.0 V

VCC

6 ns

50 pF

5.0 V

VCC

6 ns

15 pF

mna101

VCC

PULSE

GENERATOR

D.U.T.

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

001aab876

237

outputs

to five

other

decoders

17 18 19 20 21 22 23

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

A2 A1 A0

E1 E2

237

outputs

10 11 12 13 14 15

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

A2 A1 A0

E1 E2

237

outputs

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

A2 A1 A0

E1 E2

237

decoder enable

input

address

strobe

Y1 Y2 Y3 Y4 Y5 Y6 Y7

A2 A1 A0

E1 E2

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