Nexperia

74HC21

Dual 4-input AND gate

Table 8. Measurement points

Input

Output

VM

VM

VX

VY

0.5 × VCC

0.5 × VCC

0.1 × VCC

0.9 × VCC

001aah768

tW

tW

tr

tr

tf

VM

VI

negative

pulse

GND

VI

positive

pulse

GND

10 %

90 %

90 %

10 %

VM

VM

VM

tf

VCC

DUT

RT

VI

VO

CL

G

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.

Fig. 6. Test circuit for measuring switching times

Table 9. Test data

Input

Load

VI

tr, tf

CL

Test

VCC

6.0 ns

15 pF, 50 pF

tPLH, tPHL

74HC21

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© Nexperia B.V. 2023. All rights reserved

Product data sheet

Rev. 9 — 2 May 2023

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