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MB90F455 Datasheet(PDF) 62 Page - fujitsu semiconductor |
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MB90F455 Datasheet(HTML) 62 Page - fujitsu semiconductor |
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62 / 80 page  MB90455 Series 62 DS07-13728-5E (3) Power-on reset (VCC = 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C) Parameter Symbol Pin name Conditions Value Unit Remarks Min Max Power supply rise time tR VCC ⎯ 0.05 30 ms Power supply shutdown time tOFF VCC 1 ⎯ ms Waiting time until power-on VCC VCC VSS 3.0 V tR tOFF 2.7 V 0.2 V 0.2 V 0.2 V Sudden change of power supply voltage may activate the power-on reset function. When changing power supply voltages during operation, raise the power smoothly by suppressing variation of voltages as shown below. When raising the power, do not use PLL clock. Howev- er, if voltage drop is 1V/s or less, use of PLL clock is allowed during operation. Limiting the slope of rising within 50 mV/ms is recommended. RAM data hold period |
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