
MB90895 Series
DS07-13731-5E
33
4.
AC Characteristics
(1) Clock timing
(VCC
= 5.0 V±10%, VSS = AVSS = 0.0 V, TA = 40 °C to +125 °C/+150 °C (only MB90F897Y/YS))
Parameter
Symbol
Pin name
Value
Unit
Remarks
Min
Typ
Max
Clock frequency
fC
X0, X1
3—
8
MHz
When crystal or ceramic
resonator is used
3
—
16
MHz External clock
4
—
16
MHz PLL multiplied by 1
4
—
8
MHz PLL multiplied by 2
4
—
5.33
MHz PLL multiplied by 3
4
—
4
MHz PLL multiplied by 4
fCL
X0A, X1A
—
32.768
—
kHz
MB90F897/Y only
Clock cycle time
tHCYL
X0, X1
125
—
333
ns
tLCYL
X0A, X1A
—
30.5
—
μs
MB90F897/Y only
Input clock pulse width
PWH, PWL
X0
10
—
ns
Set duty factor at 30% to 70%
as a guideline.
PWLH,PWLL
X0A
—
15.2
—
μs
MB90F897/Y only
Input clock rise time and
fall time
tCR, tCF
X0
—
5
ns
When external clock is used
Internal operation clock
frequency
fCP
—
1.5
—
16
MHz When main clock is used
fLCP
—
8.192
—
kHz
When sub clock is used,
MB90F897/Y only
Internal operation clock
cycle time
tCP
—
62.5
—
666
ns
When main clock is used
tLCP
—
122.1
—
μs
When sub clock is used,
MB90F897/Y only
X0
tHCYL
tCF
tCR
0.8 VCC
0.2 VCC
PWH
PWL
X0A
tLCYL
tCF
tCR
0.8 VCC
0.2 VCC
PWLH
PWLL
Clock timing