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74F525 Datasheet, PDF (7/10 Pages) National Semiconductor (TI) – Programmable Counter
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AC Electrical Characteristics
Symbol
Parameter
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Maximum Clock Frequency
Propagation Delay
CP to Q
Propagation Delay
CP to Q 2
Propagation Delay
XTR to Q
Propagation Delay
MR to Q
Propagation Delay
MRto Q 2
Propagation Delay
Mn to Q
74F
TA e a25 C
VCC e a5 0V
CL e 50 pF
Min
Typ
Max
50
60
90
16 0
20 5
80
12 0
15 5
90
15 5
20 0
10 0
15 5
20 0
85
12 0
15 5
60
10 5
13 5
11 5
16 5
21 0
90
12 5
16 0
80
14 0
17 5
70
10 5
13 5
10 0
15 0
19 0
10 5
17 0
21 5
74F
TA VCC e Com
CL e 50 pF
Min
Max
40
80
22 5
70
17 5
80
22 0
90
22 0
75
17 5
50
15 0
10 5
23 0
80
18 0
70
19 5
60
15 0
90
21 0
95
23 5
Units
MHz
ns
ns
ns
ns
ns
ns
AC Operating Requirements
Symbol
ts(H)
ts(L)
th(H)
th(L)
ts(H)
ts(L)
th(H)
th(L)
ts(H)
ts(L)
th(H)
ts(H)
ts(L)
tw(H)
tw(L)
tw(L)
tw(H)
tw(L)
trec
trec
Parameter
Setup Time HIGH or LOW
Dn to WE
Hold Time HIGH or LOW
Dn to WE
Setup Time HIGH or LOW
Dn to CP
Hold Time HIGH or LOW
Dn to CP
Setup Time HIGH or LOW
XTR to CP
Hold Time HIGH or LOW
XTR to CP
Setup Time HIGH or LOW
Mode to CP
XTR Pulse Width HIGH
MR Pulse Width LOW
WE Pulse Width LOW
CP Pulse Width
HIGH or LOW
Recovery Time
MR to CP
Recovery Time
Mode to CP
74F
TA e a25 C
VCC e a5 0V
Min
Max
20
40
0
20
90
10 5
0
0
70
80
0
33 5
33 5
11 5
70
45
35
95
50
30 0
7
74F
TA VCC e Com
Min
Max
25
45
0
25
10 0
12 0
0
0
80
90
0
35 5
35 5
13 0
80
50
40
10 5
60
32 0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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