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AC Characteristics (cont'd)
Parameter
System Clock Timing
ALE to CLKOUT
CLKOUT high time
CLKOUT low time
CLKOUT low to ALE high
External Clock Cycle
Semiconductor Group
Symbol
20 MHz
clock
min.
max.
310
–
t
LLSH
60
–
t
SHSL
460
–
t
SLSH
10
90
t
SLLH
*
264
Device Specifications
Limit values
Variable clock
1/t
= 3.5 MHz to 20 MHz
CLCL
min.
7 t
– 40
–
CLCL
2 t
– 40
–
CLCL
10 t
– 40
–
CLCL
– 40
t
t
CLCL
CLCL
Unit
max.
ns
ns
ns
+ 40
ns
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