MB91F528 datasheet(183/241 Pages) SPANSION

183 / 241 page

D a t a S h e et

180

MB91F528_DS705-00016-1v0-E, March 28, 2014

CONFIDENTIAL

 Guaranteed operation range

Internal operation clock frequency vs. Power supply voltage

Internal operation clock frequency FCP (MHz)

80(MB91F52xR/MB91F52xU(LQFP))

2.7

5.5

MB91F52x guaranteed operation

range

PLL guaranteed operation

range

4.5

MB91F52xrecommended guaranteed

operation range

128(MB91F52xR/MB91F52xU(TEQFP),

MB91F52xM/MB91F52xY)

3.6

3.0

Note: The power supply voltage, which is the low-voltage detection setting voltage or lower, is in the

reset state.

Oscillation clock frequency vs. Internal operation clock frequency

Internal operation clock frequency

Main

Clock

PLL clock

Multipli

ed by 1

Multipli

ed by 2

Multipli

ed by 3

Multipli

ed by 4

...

Multipli

ed by

Multipli

ed by

Oscillation

clock

frequency

4MHz

2MHz

4MHz

8MHz

12MHz

16MHz

...

124MHz 128MHz

 Example of oscillation circuit

R=0Ω

C2=10pF

C1=10pF

4MHz

Note: As to the product with its clock supervisor

’s initial value is “ON”, when the oscillator is unable

to start within 20ms from the stop state the clock supervisor will detect the oscillation stop. As

a result, the CPU moves to the fail safe operation.

Design your print circuit board so that the oscillator can start oscillation within 20ms.

Moreover, it is recommended to be designed after the match evaluation of the circuit is

requested to the departure pendulum maker when the oscillation circuit is composed.

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