’F646/’F648
AC Electrical Characteristics
74F
54F
74F
e a
T
25 C
§
5.0V
A
e
50 pF
e
T
, V
CC
e
Mil
T
, V
Com
e
50 pF
A
A CC
e a
Symbol
Parameter
V
Units
CC
C
C
L
L
e
C
Min
90
50 pF
L
Max
Min
Max
Min
Max
f
Maximum Clock Frequency
75
90
MHz
ns
max
t
t
Propagation Delay
Clock to Bus
2.0
2.0
7.0
8.0
2.0
2.0
8.5
9.5
2.0
2.0
8.0
9.0
PLH
PHL
t
t
Propagation Delay
Bus to Bus (’F646)
1.0
1.0
7.0
6.5
1.0
1.0
8.0
8.0
1.0
1.0
7.5
7.0
PLH
ns
ns
ns
ns
ns
ns
ns
PHL
t
t
Propagation Delay
Bus to Bus (’F648)
2.0
1.0
8.5
7.5
1.0
1.0
10.0
9.0
2.0
1.0
9.0
8.0
PLH
PHL
t
t
Propagation Delay
2.0
2.0
8.5
8.0
2.0
2.0
11.0
10.0
2.0
2.0
9.5
9.0
PLH
SBA or SAB to A or B
PHL
t
t
Enable Time
OE to A or B
2.0
2.0
8.5
2.0
2.0
10.0
13.5
2.0
2.0
9.0
PZH
12.0
12.5
PZL
t
t
Disable Time
OE to A or B
1.0
2.0
7.5
9.0
1.0
2.0
9.0
1.0
2.0
8.5
9.5
PHZ
11.0
PLZ
t
t
Enable Time
DIR to A or B
2.0
2.0
14.0
13.0
2.0
2.0
16.0
15.0
2.0
2.0
15.0
14.0
PZH
PZL
t
t
Disable Time
DIR to A or B
1.0
2.0
9.0
1.0
2.0
10.0
12.0
1.0
2.0
9.5
PHZ
11.0
11.5
PLZ
’F646/’F648
AC Operating Requirements
74F
54F
74F
e a
e a
T
25 C
§
5.0V
A
e
e
Symbol
Parameter
T
, V
CC
Mil
T
, V
A CC
Com
Max
Units
A
V
CC
Min
Max
Min
Max
Min
t (H)
s
Setup Time, HIGH or LOW
Bus to Clock
5.0
5.0
5.0
5.0
5.0
5.0
ns
ns
ns
t (L)
s
t (H)
h
Hold Time, HIGH or LOW
Bus to Clock
2.0
2.0
2.5
2.5
2.0
2.0
t (L)
h
t
t
(H)
(L)
Clock Pulse Width
HIGH or LOW
5.0
5.0
5.0
5.0
5.0
5.0
w
w
7