Data Sheet S13918EJ3V0DS

23

Recommended Oscillator Circuit Constants

°°°°C)

Oscillator circuit constant (pF)

Manufacturer

Product name

Frequency (MHz)

C1

C2

AT-49

4.000

10

10

DAISHINKU CORP.

HC-49/U

4.000

9

9

X1

X2

C2

C1

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.

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

• Do not fetch signals from the oscillator.