UPD72012 datasheet(23/36 Pages) NEC

23 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

Recommended Oscillator Circuit Constants

Crystal oscillator (TA = 0 to +70

°°°°C)

Oscillator circuit constant (pF)

Manufacturer

Product name

Frequency (MHz)

AT-49

4.000

DAISHINKU CORP.

HC-49/U

4.000

Cautions 1. The oscillator circuit constants, which show the conditions for stabilizing and oscillating,

do not guarantee oscillation frequency accuracy. If the mounting circuit requires oscillation

frequency accuracy, it must be possible to adjust the oscillation frequency of the oscillator

in the mounting circuit. Therefore, ask the manufacturer of the oscillator you use about this

directly.

2. When using an oscillator circuit, wire portions shown using broken lines in the figure as

follows to avoid affecting wire capacitance.

• Keep the wiring length as short as possible.

• Do not cross the wiring with the other signal lines.

• Do not route the wring near a signal line through which a high fluctuating current flows.

• Always keep the ground point of the oscillator capacitor to the same potential as VSS.

• Do not ground the capacitor to a ground pattern in which a high current flows.

• Do not fetch signals from the oscillator.

UPD72012 Arkusz danych(PDF) 23 Page - NEC