
21
ATF2500CQ
0777G–12/01
ATF2500CQ Register AC Characteristics, Input Pin Clock
Symbol Parameter
-20
UnitsMin Max
t
COS
Clock to Output 11 ns
t
CFS
Clock to Feedback 0 6 ns
t
SIS
Input Setup Time 14 ns
t
SFS
Feedback Setup Time 14 ns
t
HS
Hold Time 0 ns
t
WS
Clock Width 7 ns
t
PS
Clock Period 14 ns
F
MAXS
External Feedback 1/(t
SIS
+ t
COS
)40MHz
Internal Feedback 1/(t
SFS
+ t
CFS
)50MHz
No Feedback 1/(t
PS
)71MHz
t
ARS
Asynchronous Reset/Preset Recovery Time 15 ns
ATF2500CQ Register AC Characteristics, Product Term Clock
Symbol Parameter
-20
UnitsMin Max
t
COA
Clock to Output 20 ns
t
CFA
Clock to Feedback 10 16 ns
t
SIA
Input Setup Time 10 ns
t
SFA
Feedback Setup Time 8 ns
t
HA
Hold Time 10 ns
t
WA
Clock Width 11 ns
t
PA
Clock Period 22 ns
F
MAXA
External Feedback 1/(t
SIA
+ t
COA
)33MHz
Internal Feedback 1/(t
SFA
+ t
CFA
)38MHz
No Feedback 1/(t
PS
)45MHz
t
ARA
Asynchronous Reset/Preset Recovery Time 12 ns
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