MB90347CEPF datasheet(56/93 Pages) CYPRESS

56 / 93 page

Document Number: 002-04498 Rev. *A

Page 55 of 92

MB90340E Series

11.4 AC Characteristics

11.4.1 Clock Timing

(TA  40°C to 105°C, VCC  5.0 V  10, fCP 24 MHz, VSS  AVSS  0 V)

* : When selecting the PLL clock, the range of clock frequency is limited. Use this product within the range as

mentioned in “Relation between the external clock frequency and machine clock frequency”.

Parameter

Symbol

Value

Unit

Remarks

Min

Typ

Max

Clock frequency

X0, X1



MHz

When using an oscillation circuit



MHz

PLL multiplied by 1

When using an oscillation circuit



MHz

PLL multiplied by 2

When using an oscillation circuit



8MHz

PLL multiplied by 3

When using an oscillation circuit



6MHz

PLL multiplied by 4

When using an oscillation circuit



4MHz

PLL multiplied by 6

When using an oscillation circuit



MHz

When using an external clock*

fCL

X0A, X1A

—

32.768

100

kHz

Clock cycle time

tCYL

X0, X1

62.5



333

When using an oscillation circuit

X0, X1

41.67



333

When using an external clock

tCYLL

X0A, X1A

30.5

—

s

Input clock pulse width

PWH, PWL



Duty ratio is about 30

 to 70.

PWHL, PWLL X0A

15.2



s

Input clock rise and fall time

tCR, tCF



When using external clock

Internal operating clock

frequency (machine clock)

fCP



1.5



MHz

When using main clock

fCPL



8.192

kHz

When using sub clock

Internal operating clock

cycle time (machine clock)

tCP



41.67



666

When using main clock

tCPL



122.1



s

When using sub clock

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