MB90347CE datasheet(59/85 Pages) FUJITSU

59 / 85 page

MB90340E Series

(3) Power On Reset

(TA

= −40 °C to +105 °C, VCC = 5.0 V ± 10%, fCP ≤ 24 MHz, VSS = AVSS = 0.0 V)

(4) Clock Output Timing

(TA

= −40 °C to +105 °C, VCC = 5.0 V ± 10%, VSS = 0.0 V, fCP ≤ 24 MHz)

Parameter

Symbol

Condition

Value

Unit

Remarks

Min

Max

Power on rise time

VCC

⎯

0.05

Power off time

tOFF

VCC

⎯

Due to repetitive operation

Parameter

Symbol

Condition

Value

Unit

Remarks

Min

Max

Cycle time

tCYC

CLK

⎯

62.5

⎯

fCP

= 16 MHz

41.76

⎯

fCP

= 24 MHz

CLK

↑ → CLK ↓

tCHCL

CLK

⎯

fCP

= 16 MHz

⎯

fCP

= 24 MHz

VCC

VSS

3 V

tOFF

2.7 V

0.2 V

Holds RAM data

If you change the power supply voltage too rapidly, a power on reset may occur.

We recommend that you startup smoothly by restraining voltages when changing

the power supply voltage during operation, as shown in the figure below. Perform

while not using the PLL clock. However, if voltage drops are within 1 V/s, you can

operate while using the PLL clock.

We recommend a rise of

50 mV/ms maximum.

CLK

2.4 V

tCYC

2.4 V

0.8 V

tCHCL

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