HD404339FS datasheet(30/80 Pages) RENESAS

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HD404339 Series

Table 4

Oscillator Circuit Examples

Circuit Configuration

Circuit Constants

External clock

operation

External

oscillator

OSC

Open

OSC

Ceramic oscillator

(OSC

1, OSC 2)

OSC

Ceramic

GND

Ceramic oscillator: CSA4.00MG

(Murata)

f = 1 MΩ ±20%

1 = C2 = 30 pF ±20%

Crystal oscillator

(OSC

1, OSC 2)

OSC

Crystal

GND

OSC1

OSC2

f = 1 MΩ ±20%

1 = C2 = 10 to 22 pF ±20%

Crystal: Equivalent to circuit shown below

0 = 7 pF max.

S = 100 Ω max.

Crystal oscillator

(X1, X2)

Crystal

GND

Crystal: 32.768 kHz: MX38T (Nippon

Denpa)

1 = C2 = 20 pF ±20%

S = 14 kΩ

0 = 1.5 pF

Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator and stray

capacitance of the board, the user should consult with the crystal or ceramic oscillator

manufacturer to determine the circuit parameters.

2. Wiring among OSC

1, OSC 2, X1, X2 and elements should be as short as possible, and must not

cross other wiring (see figure 19).

3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open.

HD404339FS データシート(PDF) 30 Page - Renesas Technology Corp

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