74HC_HCT238

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Product data sheet

Rev. 4 — 27 January 2016

11 of 19

NXP Semiconductors

74HC238; 74HCT238

3-to-8 line decoder/demultiplexer

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.

RL = Load resistance.

S1 = Test selection switch

Fig 8.

Test circuit for measuring switching times

Table 9.

Test data

Type

Input

Load

S1 position

VI

tr, tf

CL

RL

tPHL, tPLH

74HC238

VCC

6ns

15pF, 50 pF

1k



open

74HCT238

3V

6ns

15pF, 50 pF

1k



open