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MB90F482 Datasheet(PDF) 89 Page - fujitsu semiconductor |
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MB90F482 Datasheet(HTML) 89 Page - fujitsu semiconductor |
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89 / 113 page  MB90480/485 Series 89 (4) Power-on Reset Standards (VCC = 2.7 V to 3.6 V, VSS = 0.0 V, TA = −40 °C to +85 °C) * : Power rise time requires VCC < 0.2 V. Notes: • The above standards are for the application of a power-on reset. • Within the device, the power-on reset should be applied by switching the power supply off and on again. Parameter Symbol Pin name Conditions Value Unit Remarks Min Max Power rise time tR VCC 30 ms * Power down time tOFF VCC 1 ms In repeated operation VCC VCC VSS tR tOFF 2.7 V 0.2 V 0.2 V 0.2 V Rapid fluctuations in power supply voltage may trigger a power-on reset in some cases. As shown below, when changing supply voltage during operation, it is rec- ommended that voltage changes be suppressed and a smooth restart be applied. The slope of voltage increase should be kept within 50 mV/ms. RAM data maintenance Main power supply voltage Sub power supply voltage |
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