Datasheet

8
R to Q t
PHL
C
L
= 50pF 4.5 - - 40 - 50 - 60 ns
C
L
= 15pF 5 - 17 - - - - - ns
R to Qt
PLH
C
L
= 50pF 4.5 - - 50 - 63 - 75 ns
C
L
= 15pF 5 - 21 - - - - - ns
Output Transition Time t
TLH
, t
THL
C
L
= 50pF 4.5 - - 15 - 19 - 22 ns
Output Pulse Width
R
X
= 10k, C
X
= 0.1µF
τ
C
L
= 50pF 5 0.63 - 0.77 0.602 0.798 0.595 0.805 ms
Output Pulse Width Match,
Same Package
----±1- - - - - %
Power Dissipation Capacitance
(Notes 8, 9)
C
PD
C
L
= 15pF 5 - 134 - - - - - pF
Input Capacitance C
I
C
L
= 50pF - 10 - 10 - 10 - 10 pF
NOTES:
8. C
PD
is used to determine the dynamic power consumption, per one shot.
9. P
D
=(C
PD
+C
X
)V
CC
2
f
i
∑(C
L
V
CC
2
f
O
) where f
i
= input frequency, f
O
= output frequency, C
L
= output load capacitance,
C
X
= external capacitance V
CC
= supply voltage assuming f
i
«
Switching Specifications C
L
= 50pF, Input t
r
, t
f
= 6ns, R
X
= 10KΩ, C
X
= 0 (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
I
τ
--
Test Circuits and Waveforms
FIGURE 6. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
FIGURE 7. 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%
CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538