AC Electrical Characteristics
(MM54HC242
V
CC
e
5V T
A
e
25 C t
r
e
t
f
e
6 ns
Symbol
t
PHL
t
PLH
t
PZH
t
PZL
t
PHZ
t
PHL
Parameter
Maximum Propagation Delay
Maximum Output Enable
Time to Active Output
Maximum Output Disable
Time from Active Output
MM74HC242)
Typ
12
17
15
Guaranteed Limit
18
28
25
Units
ns
ns
ns
Conditions
C
L
e
45 pF
R
L
e
1kX
C
L
e
45 pF
R
L
e
1 kX
C
L
e
5 pF
MM74HC242 MM54HC243 MM74HC243)
V
CC
e
2 0V to 6 0V C
L
e
50 pF t
r
e
t
f
e
6 ns (unless otherwise specified)
T
A
e
25 C
Symbol
t
PHL
t
PLH
Parameter
Maximum Propagation
Delay
Conditions
C
L
e
50 pF
C
L
e
150 pF
C
L
e
50 pF
C
L
e
150 pF
C
L
e
50 pF
C
L
e
150 pF
t
PZH
t
PZL
Maximum Output Enable
Time to Active Output
R
L
e
1 kX
C
L
e
50 pF
C
L
e
150 pF
C
L
e
50 pF
C
L
e
150 pF
C
L
e
50 pF
C
L
e
150 pF
t
PHZ
t
PLZ
Maximum Output Disable
Time from Active Output
Maximum Output
Rise and Fall
Time
Power Dissipation
Capacitance (Note 5)
Maximum Input Capacitance
Maximum Output Capacitance
(per buffer)
Outputs Disabled
Outputs Enabled
R
L
e
1 kX
C
L
e
50 pF
V
CC
Typ
2 0V
2 0V
4 5V
4 5V
6 0V
6 0V
2 0V
2 0V
4 5V
4 5V
6 0V
6 0V
2 0V
4 5V
6 0V
2 0V
4 5V
6 0V
12
50
5
10
10
20
10
20
10
20
55
80
12
22
11
18
75
100
15
30
13
17
75
15
13
100
150
20
30
17
26
150
200
30
40
26
34
150
30
26
60
12
10
74HC
T
A
eb
40 to 85 C
Guaranteed Limits
126
190
25
38
21
32
189
252
38
50
32
43
189
38
32
75
15
13
149
224
30
45
25
38
224
298
45
60
38
51
224
45
38
90
18
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
pF
pF
54HC
T
A
eb
55 to 125 C
Units
AC Electrical Characteristics
(MM54HC242
t
TLH
t
THL
C
PD
C
IN
C
OUT
Note 5
C
PD
determines the no load dynamic power consumption P
D
e
C
PD
V
CC2
f
a
I
CC
V
CC
and the no load dynamic current consumption I
S
e
C
PD
V
CC
f
a
I
CC
3