www.fairchildsemi.com
4
74
V
HC244
AC Electrical Characteristics
Note 4: Parameter guaranteed by design. tOSLH
|tPLHmax tPLHmin|; tOSHL
|tPHLmax tPHLmin|.
Note 5: CPD 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: ICC (OPR.)
CPD * VCC * fIN ICC/8 (per bit).
Symbol
Parameter
VCC
TA 25qCTA 40qC to 85qC
Units
Conditions
(V)
Min
Typ
Max
Min
Max
tPLH
Propagation Delay
3.3
r 0.3
5.8
8.4
1.0
10.0
ns
CL 15 pF
tPHL
Time
8.3
11.9
1.0
13.5
CL 50 pF
5.0
r 0.5
3.9
5.5
1.0
6.5
ns
CL 15 pF
5.4
7.5
1.0
8.5
CL 50 pF
tPZL
3-STATE Output
3.3
r 0.3
6.6
10.6
1.0
12.5
ns
RL 1 k:
CL 15 pF
tPZH
Enable Time
9.1
14.1
1.0
16.0
CL 50 pF
5.0
r 0.5
4.7
7.3
1.0
8.5
ns
CL 15 pF
6.2
9.3
1.0
10.5
CL 50 pF
tPLZ
3-STATE Output
3.3
r 0.3
10.3
14.0
1.0
16.0
ns
RL 1 k:
CL 50 pF
tPHZ
Disable Time
5.0
r 0.5
6.7
9.2
1.0
10.5
CL 50 pF
tOSLH
Output to Output
3.3
r 0.3
1.5
ns
(Note 4)
CL 50 pF
tOSHL
Skew
5.0
r 0.5
1.0
CL 50 pF
CIN
Input Capacitance
4
10
pF
VCC Open
COUT
Output Capacitance
6
pF
VCC 5.0V
CPD
Power Dissipation Capacitance
19
pF
(Note 5)