UPD720122 查看數據表（PDF） - NEC => Renesas Technology
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UPD720122 Datasheet PDF : 82 Pages
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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
Clock frequency
Clock Duty cycle
Symbol
Condition
fCLK
X’tal
Oscillator block
TDUTY
Min.
-500ppm
-500ppm
40
Typ.
Max.
Unit
30
+500ppm
MHz
30
+500ppm
MHz
50
60
%
Remarks 1.
2.
Reccomended accurarcy of clock frequency is ±100ppm.
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
TR
Reset width
Specification
Min.
Typ.
Max.
Unit
2
µs
HW reset timing
RESETB
TR
20
Data Sheet S16685EJ2V0DS
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