MC74VHC244
http://onsemi.com
4
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
= 3.0 ns)
Symbol Parameter Test Conditions
T
A
= 25°C T
A
3 85°C
−55°C 3 T
A
3 125°C
Unit
Min Typ Max Min Max Min Max
t
PLH
,
t
PHL
Maximum Propagation
Delay, A to YA or
B to YB
V
CC
= 3.3 ± 0.3 V C
L
= 15 pF
C
L
= 50 pF
5.8
8.3
8.4
11.9
1.0
1.0
10.0
13.5
1.0
1.0
11.0
14.5
ns
V
CC
= 5.0 ± 0.5 V C
L
= 15 pF
C
L
= 50 pF
3.9
5.4
5.5
7.5
1.0
1.0
6.5
8.5
1.0
1.0
7.5
9.5
t
PZL
,
t
PZH
Output Enable Time
OEA
to YA or
OEB
to YB
V
CC
= 3.3 ± 0.3 V C
L
= 15 pF
R
L
= 1 kW C
L
= 50 pF
6.6
9.1
10.6
14.1
1.0
1.0
12.5
16.0
1.0
1.0
13.5
17.0
ns
V
CC
= 5.0 ± 0.5 V C
L
= 15 pF
R
L
= 1 kW C
L
= 50 pF
4.7
6.2
7.3
9.3
1.0
1.0
8.5
10.5
1.0
1.0
9.5
11.5
t
PLZ
,
t
PHZ
Output Disable Time
OEA
to YA or
OEB
to YB
V
CC
= 3.3 ± 0.3 V C
L
= 50 pF
R
L
= 1 kW
10.3 14.0 1.0 16.0 1.0 17.0
ns
V
CC
= 5.0 ± 0.5 V C
L
= 50 pF
R
L
= 1 kW
6.7 9.2 1.0 10.5 1.0 11.5
t
OSLH
,
t
OSHL
Output to Output Skew
V
CC
= 3.3 ± 0.3 V C
L
= 50 pF
(Note 6)
1.5 1.5 1.5
ns
V
CC
= 5.0 ± 0.5 V C
L
= 50 pF
(Note 6)
1.0 1.0 1.5
C
in
Maximum Input
Capacitance
4 10 10 10 pF
C
out
Maximum Three−State
Output Capacitance
(Output in High−Impedance
State)
6 pF
C
PD
Power Dissipation Capacitance (Note 7)
Typical @ 25°C, V
CC
= 5.0V
pF
19
6. Parameter guaranteed by design. t
OSLH
= |t
PLHm
− t
PLHn
|, t
OSHL
= |t
PHLm
− t
PHLn
|.
7. C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
Average operating current can be obtained by the equation: I
CC(OPR
)
= C
PD
V
CC
f
in
+ I
CC
/ 8 (per bit). C
PD
is used to determine the no−load
dynamic power consumption; P
D
= C
PD
V
CC
2
f
in
+ I
CC
V
CC
.
NOISE CHARACTERISTICS (Input t
r
= t
f
= 3.0 ns, C
L
= 50 pF, V
CC
= 5.0 V)
Symbol
Parameter
T
A
= 25°C
Unit
Typ Max
V
OLP
Quiet Output Maximum Dynamic V
OL
0.6 0.9 V
V
OLV
Quiet Output Minimum Dynamic V
OL
−0.6 −0.9 V
V
IHD
Minimum High Level Dynamic Input Voltage 3.5 V
V
ILD
Maximum Low Level Dynamic Input Voltage 1.5 V
