AC Electrical Characteristics
54ACT
=
VCC
(V)
TA −55˚C
Symbol
Parameter
to +125˚C
Units
=
(Note 10)
CL 50 pF
Min
Max
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Maximum Clock
5.0
5.0
5.0
5.0
5.0
5.0
5.0
90
MHz
ns
Frequency
Propagation Delay, CP to Qn
(PE Input HIGH or LOW)
Propagation Delay, CP to Qn
(PE Input HIGH or LOW)
Propagation Delay
CP to TC
1.5
1.5
1.5
1.5
1.5
1.5
10.5
10.5
12.5
13.0
9.5
ns
ns
Propagation Delay
CP to TC
ns
Propagation Delay
CET to TC
ns
Propagation Delay
CET to TC
9.5
ns
±
Note 10: Voltage Range 5.0 is 5.0V 0.5V
AC Operating Requirements
54ACT
=
VCC
TA −55˚C
Symbol
Parameter
(V)
to +125˚C
Units
=
CL 50 pF
(Note 11)
Guaranteed
Minimum
13.5
ts
th
ts
th
ts
th
ts
th
tw
tw
Setup Time, HIGH or LOW
Pn to CP
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Hold Time, HIGH or LOW
Pn to CP
0.5
13.5
0.0
Setup Time, HIGH or LOW
SR to CP
Hold Time, HIGH or LOW
SR to CP
Setup Time, HIGH or LOW
PE to CP
11.5
0.0
Hold Time, HIGH or LOW
PE to CP
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
7.0
0.5
5.0
Clock Pulse Width
(Count) HIGH or LOW
5.0
±
Note 11: Voltage Range 5.0 is 5.0V 0.5V
www.national.com
8
NSC [ National Semiconductor ]
