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UPD754144GS Datasheet(PDF) 49 Page - NEC |
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UPD754144GS Datasheet(HTML) 49 Page - NEC |
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49 / 88 page  49 µPD754144, 754244 • µPD754144 System Clock Oscillator Characteristics (TA = –40 to +85 °C, VDD = 1.8 to 6.0 V) Resonator Recommended Constant Parameter Testing Conditions MIN. TYP. MAX. Unit RC Oscillation 0.4 2.0 MHz oscillator frequency (fcc) Note Note Only the oscillator characteristics are shown. For the instruction execution time and oscillation frequency characteristics, refer to AC Characteristics. Caution When using the oscillation circuit of the system clock, wire the portion enclosed in dotted lines in the figures as follows to avoid adverse influences on the wiring capacitance: • Keep the wire length as short as possible. • Do not cross other signal lines. • Do not route the wiring in the vicinity of lines though which a high fluctuating current flows. • Always keep the ground point of the capacitor of the oscillation circuit as the same potential as VSS. • Do not connect the power source pattern through which a high current flows. • Do not extract signals from the oscillation circuit. CL1 CL2 • |
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