MC74HC4538A
http://onsemi.com
5
AC CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6.0 ns)
Symbo
Parameter
V
CC
V
Guaranteed Limits
Unit
–55 to 25_C v 85_ C v 125_C
Min Max Min Max Min Max
t
PLH
Maximum Propagation Delay
Input A or B to Q
(Figures 6 and 8)
2.0
4.5
6.0
175
35
30
220
44
37
265
53
45
ns
t
PHL
Maximum Propagation Delay
Input A or B to NQ
(Figures 6 and 8)
2.0
4.5
6.0
195
39
33
245
49
42
295
59
50
ns
t
PHL
Maximum Propagation Delay
Reset to Q
(Figures 7 and 8)
2.0
4.5
6.0
175
35
30
220
44
37
265
53
45
ns
t
PLH
Maximum Propagation Delay
Reset to NQ
(Figures 7 and 8)
2.0
4.5
6.0
175
35
30
220
44
37
265
53
45
ns
t
TLH,
t
THL
Maximum Output Transition Time, Any Output
(Figures 7 and 8)
2.0
4.5
6.0
75
15
13
95
19
16
110
22
19
ns
C
in
Maximum Input Capacitance (A. B, Reset)
(C
x
, R
x
)
− 10
25
10
25
10
25
pF
9. For propagation delays with loads other than 50 pF, and information on typical parametric values, see the ON Semiconductor High−Speed
CMOS Data Book (DL129/D).
C
PD
Power Dissipation Capacitance (per Multivibrator)*
Typical @ 25°C, V
CC
= 5.0 V
pF
150
*Used to determine the no−load dynamic power consumption: P
D
= C
PD
V
CC
2
f + I
CC
V
CC
. For load considerations, see the ON Semiconductor
High−Speed CMOS Data Book (DL129/D).
TIMING CHARACTERISTICS (Input t
r
= t
f
= 6.0 ns)
Symbo
Parameter
V
CC
V
Guaranteed Limits
Unit
–55 to 25_C v 85_ C v 125_C
Min Max Min Max Min Max
t
rec
Minimum Recovery Time, Inactive to A or B
(Figure 7)
2.0
4.5
6.0
0
0
0
0
0
0
0
0
0
ns
t
w
Minimum Pulse Width, Input A or B
(Figure 6)
2.0
4.5
6.0
60
12
10
75
15
13
90
18
15
ns
t
w
Minimum Pulse Width, Reset
(Figure 7)
2.0
4.5
6.0
60
12
10
75
15
13
90
18
15
ns
t
r
, t
f
Maximum Input Rise and Fall Times, Reset
(Figure 7)
2.0
4.5
6.0
1000
500
400
1000
500
400
1000
500
400
ns
A or B
(Figure 7)
2.0
4.5
6.0
No Limit
