Datasheet

74HC21_5 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 05 — 7 May 2009 6 of 14
NXP Semiconductors
74HC21
Dual 4-input AND gate
11. Waveforms
Measurement points are given in Table 8.
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 7. Waveforms showing the input (nA, nB, nC, nD) to output (nY) propagation delays and the output
transition times
001aab977
nA, nB, nC,
nD input
nY output
V
M
V
X
V
I
t
PHL
t
THL
t
TLH
t
PLH
V
OH
V
M
V
Y
V
OL
GND
Table 8. Measurement points
Type Input Output
V
M
V
M
V
X
V
Y
74HC21 0.5V
CC
0.5V
CC
0.1V
CC
0.9V
CC