IN74HCT21A
AC ELECTRICAL CHARACTERISTICS
(C
L
=50pF,Input t
r
=t
f
=6.0 ns)
V
CC
Symbol
t
PHL
, t
PLH
t
THL
, t
TLH
C
IN
Parameter
Maximum Propagation Delay (Figure 1)
Maximum Output Transition Time (Figure 1)
Maximum Input Capacitance
V
4.5
4.5
5.0
Guaranteed Limit
25
°C
to
-55°C
27
15
10
≤85°C
34
19
10
≤125°C
41
22
10
Unit
ns
ns
pF
Power Dissipation Capacitance (Per Gate)
C
PD
Used to determine the no-load dynamic power
consumption:
P
D
=C
PD
V
CC2
f+I
CC
V
CC
T
A
=25°C,V
CC
=5.0 V
50
pF
t
LH
0.9
0.9
V
1
t
HL
V
IH
Input
0.1
V
1
0.1
GND
V
OH
t
PLH
0.9
t
PHL
0.9
V
1
0.1
Output
V
1
0.1
0V
t
TLH
V
1
= 1.3 V
V
I
= 3.0 V
t
THL
Figure 1. Switching Waveforms
V
CC
V
I
PULSE
GENERATOR
R
T
DEVICE
UNDER
TEST
V
O
Termination resistance R
T
– should
be equal to Z
OUT
of pulse
generators
C
L
50 pF
Figure 2. Test Circuit
INTEGRAL
4
INTEGRAL [ INTEGRAL CORP. ]
