Datasheet

5
Transition Times (Figure1) t
TLH
, t
THL
C
L
= 50pF 2 - - 75 - 95 - 110 ns
4.5 - - 15 - 19 - 22 ns
6 - - 13 - 16 - 19 ns
Input Capacitance C
I
- - - - 10 - 10 - 10 pF
Power Dissipation Capacitance
(Notes 3, 4)
C
PD
- 5-26-----pF
HCT TYPES
Propagation Delay, Input to
Output (Figure 2)
t
PLH
, t
PHL
C
L
= 50pF 4.5 - - 28 - 35 - 42 ns
Propagation Delay, Data Input to
Output Y
t
PLH
, t
PHL
C
L
= 15pF 5 - 11 - ----ns
Transition Times (Figure 2) t
TLH
, t
THL
C
L
= 50pF 4.5 - - 15 - 19 - 22 ns
Input Capacitance C
I
- - - - 10 - 10 - 10 pF
Power Dissipation Capacitance
(Notes 3, 4)
C
PD
- 5-38-----pF
NOTES:
3. C
PD
is used to determine the dynamic power consumption, per gate.
4. P
D
= V
CC
2
f
i
(C
PD
+ C
L
) where f
i
= input frequency, C
L
= output load capacitance, V
CC
= supply voltage.
Switching Specifications Input t
r
, t
f
= 6ns (Continued)
PARAMETER SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C -40
o
C TO 85
o
C -55
o
C TO 125
o
C
UNITSMIN TYP MAX MIN MAX MIN MAX
Test Circuits and Waveforms
FIGURE 1. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
t
PHL
t
PLH
t
THL
t
TLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
V
CC
t
r
= 6ns t
f
= 6ns
90%
t
PHL
t
PLH
t
THL
t
TLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
t
r
= 6ns
t
f
= 6ns
90%
CD54HC20, CD74HC20, CD54HCT20, CD74HCT20