MB90480/485 Series
4. AC Characteristics
(1) Clock Timing
(VSS = 0.0 V, TA = −40 °C to +85 °C)
Value
Typ
Sym-
Condi-
tion
Parameter
Clock frequency
Clock cycle time
Pin name
Unit
Remarks
bol
Min
Max
External crystal
oscillator
⎯
3
⎯
25
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
3
4
⎯
⎯
50
25
External clock input
1 multiplied PLL
2 multiplied PLL
3 multiplied PLL
4 multiplied PLL
6 multiplied PLL
8 multiplied PLL
3
⎯
12.5
6.66
6.25
4.16
3.12
⎯
FCH
X0, X1
MHz
kHz
3
⎯
3
⎯
3
⎯
3
⎯
FCL
tC
X0A, X1A
X0, X1
⎯
20
⎯
32.768
⎯
333
⎯
ns *1
tCL
X0A, X1A
30.5
µs
PWH
PWL
X0
X0A
X0
⎯
⎯
⎯
5
⎯
15.2
⎯
⎯
⎯
5
ns
Input clock pulse width
Input clock rise, fall time
PWLH
PWLL
⎯
⎯
µs *2
tcr
tcf
ns With external clock
fCP
fCPL
tCP
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
1.5
⎯
⎯
25
⎯
MHz *1
kHz
Internal operating clock
frequency
8.192
⎯
40.0
⎯
666
⎯
ns *1
µs
Internal operating clock
cycle time
tCPL
122.1
*1 : Be careful of the operating voltage.
*2 : Duty ratio should be 50 % 3 %.
88
FUJITSU [ FUJITSU ]
