FEDL66517-01
1
Semiconductor
ML66517 Family
AC Characteristics
(1) External program memory control
(VDD = 4.5 to 5.5 V, Ta = –40 to +85°C)
Parameter
Cycle time
Symbol
tcyc
Condition
Min.
40
Max.
—
Unit
fOSC = 25 MHz
Clock pulse width (HIGH level)
Clock pulse width (LOW level)
ALE pulse width
tφWH
tφWL
tAW
13
—
13
—
2tφ – 10
2tφ – 18
tφ – 5
2tφ – 15
tφ – 13
3tφ – 30
–8
—
PSEN pulse width
tPW
—
PSEN pulse delay time
Low address setup time
Low address hold time
High address setup time
High address hold time
Instruction setup time
Instruction hold time
tPAD
tALS
tALH
tAHS
tAHH
tIS
—
ns
CL = 50 pF
—
—
—
—
30
—
tIH
–8
tφ – 3
Note: tφ = tcyc/2
tcyc
CPUCLK
tφWH
tφWL
tAW
ALE
PSEN
tPAD
tPW
AD0 to AD7
A8 to A16
PC0 to 7
INST0 to 7
tIS
tIH
tALS
tALH
PC8 to 16
tAHH
tAHS
Bus timing during no wait cycle time
19/29
OKI [ OKI ELECTRONIC COMPONETS ]
