74HC_HCT157_15 datasheet(10/19 Pages) PHILIPS

10 / 19 page

74HC_HCT157

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Product data sheet

Rev. 7 — 21 January 2015

10 of 19

NXP Semiconductors

74HC157; 74HCT157

Quad 2-input multiplexer

Test data is given in Table 9.

Definitions 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 9.

Test circuit for measuring switching times

Table 9.

Test data

Type

Input

Load

Test

VI

tr, tf

CL

74HC157

VCC

6.0 ns

15 pF, 50 pF

tPLH, tPHL

74HCT157

3.0 V

6.0 ns

15 pF, 50 pF

tPLH, tPHL

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