MB90F438LPF datasheet(37/61 Pages) CYPRESS

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MB90435 Series

DS07-13727-2E

(2) Clock Output Timing

(MB90F438L (S) /437L (S) /438L (S) : VCC

= 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

(MB90F439 (S) /439 (S) /V540G : VCC

= 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

(3) Reset and Hardware Standby Input Timing

(MB90F438L (S) /437L (S) /438L (S) : VCC

= 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

(MB90F439 (S) /439 (S) /V540G : VCC

= 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

“tcp” represents one cycle time of the machine clock.

Oscillation time of oscillator is time that amplitude reached the 90

%. In the crystal oscillator, the oscillation time is

between several ms to tens of ms. In ceramic oscillator, the oscillation time is between handreds of

µs to

several ms. In the external clock, the oscillation time is 0 ns.

Any reset can not fully initialize the Flash Memory if it is performing the automatic algorithm.

Parameter

Symbol

Pin name

Condition

Value

Units

Remarks

Min

Max

Cycle time

tCYC

CLK

VCC

= 5 V ± 10%

62.5

⎯

CLK

↑ →CLK↓

tCHCL

⎯

Parameter

Symbol

name

Value

Units

Remarks

Min

Max

Reset input time

tRSTL

RST

4 tCP

⎯

Under normal operation

Oscillation time of

oscillator

+ 4 tCP

⎯

In stop mode

100

⎯µs

Pseudo timer mode

(MB90437L (S) /438L (S) )

4 tCP

⎯

Pseudo timer mode

(Other than MB90437L (S)

/438L (S) )

2 tCP

⎯µs

In sub clock mode, sub

sleep mode and watch

mode

Hardware standby input time

tHSTL

HST

4 tCP

⎯

Under normal operation

CLK

tCYC

2.4 V

0.8 V

tCHCL

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