MB90495 Series

MB90495 Series Data Sheet (Advance Information)

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FME EMDC June 19, 2000

14. AC CHARACTERISTICS

14.1 Clock Timing

*: Frequency deviation indicates the maximum frequency difference from the target frequency when using a multiplied clock.

Parameter

Symbol

Pin

Rated Value

Units

Remarks

Min.

Typ.

Max.

Oscillation frequency

X0, X1

3

—

16

MHz

X0A, X1A

—

32.768

—

kHz

Oscillation cycle time

X0, X1

62.5

—

333

ns

X0A, X1A

—

30.5

—

µs

Frequency deviation with

PLL *

∆f—

—

—

5

%

Input clock pulse width

X0

10

—

—

ns

Duty ratio is about 30 to

70%.

X0A

—

15.2

—

µs

Input clock rise and fall

time

X0

—

—

5

ns

When using external clock

Machine clock frequency

—

1.5

—

16

MHz

When using main clock

—

—

8.192

—

kHz

When using sub-clock

Machine clock cycle time

—

62.5

—

666

ns

When using main clock

—

—

122.1

—

µs

When using sub-clock

|a|

+a

–a

∆f =

× 100%

X0

X0A