AC Operating Requirements (Continued)
54ACT
=
VCC
(V)
TA −55˚C
Fig.
No.
Symbol
Parameter
to +125˚C
Units
=
(Note
11)
CL 50 pF
Guaranteed Minimum
th
ts
Hold Time, HIGH or LOW
PE to CP
5.0
5.0
5.0
5.0
5.0
0
ns
ns
ns
ns
ns
Setup Time, HIGH or LOW
CEP or CET to CP
Hold Time, HIGH or LOW
CEP or CET to CP
Clock Pulse Width,
(Load) HIGH or LOW
Clock Pulse Width,
(Count) HIGH or LOW
MR Pulse Width, LOW
Recovery Time
7.0
0.5
5.0
5.0
th
tw
tw
tw
5.0
5.0
6.5
0.5
ns
ns
trec
MR to CP
±
Note 11: Voltage Range 5.0 is 5.0V 0.5V
Capacitance
Symbol
CIN
CPD
Parameter
Typ
4.5
Units
Conditions
=
VCC OPEN
Input Capacitance
pF
pF
=
VCC 5.0V
Power Dissipation Capacitance
45.0
9
www.national.com
NSC [ National Semiconductor ]
