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MB90F482 数据表(PDF) 83 Page - fujitsu semiconductor |
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MB90F482 数据表(HTML) 83 Page - fujitsu semiconductor |
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83 / 113 page  MB90480/485 Series 83 4. AC Characteristics (1) Clock Timing Standards (VSS = 0.0 V, TA = −40 °C to +85 °C) *1 : Be careful of the operating voltage. *2 : Duty raito should be 50 % ± 3 %. Parameter Sym- bol Pinname Condi- tion Value Unit Remarks Min Typ Max Clock frequency FCH X0, X1 3 25 MHz External crystal oscillator 3 50 External clock input 4 25 1 multiplied PLL 3 12.5 2 multiplied PLL 3 6.66 3 multiplied PLL 3 6.25 4 multiplied PLL 3 4.16 6 multiplied PLL 3 3.12 8 multiplied PLL FCL X0A, X1A 32.768 kHz Clock cycle time tC X0, X1 20 333 ns *1 tCL X0A, X1A 30.5 µs Input clock pulse width PWH PWL X0 5 ns PWLH PWLL X0A 15.2 µs*2 Input clock rise, fall time tcr tcf X0 5 ns With external clock Internal operating clock frequency fCP 1.5 25 MHz *1 fCPL 8.192 kHz Internal operating clock cycle time tCP 40.0 666 ns *1 tCPL 122.1 µs |
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