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MB90867E Datasheet(PDF) 60 Page - Fujitsu Component Limited. |
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MB90867E Datasheet(HTML) 60 Page - Fujitsu Component Limited. |
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60 / 67 page  MB90860E Series 60 7. Notes on A/D Converter Section Use the device with external circuits of the following output impedance for analog inputs : Recommended output impedance of external circuits are : Approx. 1.5 k Ω or lower (4.0 V ≤ AVCC ≤ 5.5 V, sampling period ≤ 0.5 µs) If an external capacitor is used, in consideration of the effect by tap capacitance caused by external capacitors and on-chip capacitors, capacitance of the external one is recommended to be several thousand times as high as internal capacitor. If output impedance of an external circuit is too high, a sampling period for an analog voltage may be insufficient. 8. Flash Memory Program/Erase Characteristics * : This value comes from the technology qualification (using Arrhenius equation to translate high temperature measurements into normalized value at +85 °C) . Parameter Conditions Value Unit Remarks Min Typ Max Sector erase time TA = +25 °C VCC = 5.0 V ⎯ 115 s Excludes programming prior to erasure Chip erase time ⎯ 9 ⎯ s Excludes programming prior to erasure Word (16-bit width) programming time ⎯ 16 3600 µs Except for the over head time of the system Programs/Erase cycle ⎯ 10000 ⎯⎯ cycle Flash Data Retention Time Average TA = +85 °C 20 ⎯⎯ Year * C Comparator Analog input R 4.5 V ≤ AVCC ≤ 5.5 V : R := 2.52 kΩ, C := 10.7 pF 4.0 V ≤ AVCC < 4.5 V : R := 13.6 kΩ, C := 10.7 pF • Analog input circuit model Note : Use the values in the figure only as a guideline. |
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