MB90540/540G/545/545G Series
4. AC Characteristics
(1) Clock Timing
(MB90F543/F549: VCC = 5.0 V±10%, VSS = AVSS = 0.0 V, TA = −40 °C to +85 °C)
(MB90543G(S)/547G(S)/548G(S)/F548GL(S): VCC = 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)
(Other than MB90F543/F549/543G(S)/547G(S)/548G(S)/F548GL(S):
VCC = 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)
Value
Parameter
Symbol Pin name
Units
Remarks
Min
Typ
Max
3
16
MHz VCC = 5.0 V±10%
fC
X0, X1
X0A, X1A
X0, X1
VCC<4.5 (MB90F548GL(S)/
Oscillation frequency
3
5
MHz
kHz
543G(S)/547G(S)/548G(S))
fCL
32.768
62.5
200
333
333
ns VCC = 5.0 V±10%
tCYL
VCC<4.5 (MB90F548GL(S)/
ns
Oscillation cycle time
Input clock pulse width
543G(S)/547G(S)/548G(S))
tLCYL
X0A, X1A
X0
30.5
15.2
µs
PWH, PWL
PWLH, PWLL
10
ns
Duty ratio is about 30% to
70%.
X0A
µs
Input clock rise and fall
time
tCR, tCF
X0
5
ns When using external clock
fCP
fLCP
tCP
1.5
16
MHz When using main clock
kHz When using sub-clock
ns When using main clock
µs When using sub-clock
Machine clock frequency
Machine clock cycle time
8.192
122.1
62.5
666
tLCP
• Clock Timing
tCYL
0.8 VCC
0.2 VCC
X0
PWH
PWL
tCF
tCR
tLCYL
0.8 VCC
0.2 VCC
X0A
PWLH
PWLL
tCF
tCR
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