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UPD720122 Datasheet(PDF) 20 Page - NEC |
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UPD720122 Datasheet(HTML) 20 Page - NEC |
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20 / 82 page  Data Sheet S16685EJ2V0DS 20 µPD720122 2.6 AC Characteristics (TA = 0 to +70 °°°°C, VDD = 3.3 V ±±±±10%) The AC characteristics are classified into those of the USB interface block and those of the BIU. 2.6.1 Overall AC characteristics and those of BIU (1) Clock Parameter Symbol Condition Min. Typ. Max. Unit Clock frequency f CLK X’tal -500ppm 30 +500ppm MHz Oscillator block -500ppm 30 +500ppm MHz Clock Duty cycle T DUTY 40 50 60 % Remarks 1. Reccomended accurarcy of clock frequency is ±100ppm. 2. Required accurarcy of X’tal or Oscillator block is includeing initial frequency accuracy, the spread of X’tal capacityor loading, supply voltage, temperature, and aging etc. (2) Reset Symbol Specification Min. Typ. Max. Unit TR Reset width 2 µs HW reset timing RESETB TR |
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