HCD404344R View Datasheet(PDF) -

HD404344R Series/HD404394 Series

Table 16 Oscillator Circuit Examples

Circuit Configuration

External clock operation

External

oscillator

OSC 1

Circuit Constants

Open

OSC2

Ceramic oscillator

(OSC1, OSC2)

CR oscillation

(OSC1, OSC2)

HD404344R series

C1

Ceramic

oscillator

C2

GND

OSC1

Rf

OSC2

OSC1

Rf

OSC2

Ceramic oscillator : CSA4.00MG (Murata)

Rf = 1 MΩ ±20%

C1 = C2 = 30 pF ±20%

Ceramic oscillator: KBR-4.0MSA (Kyocera)

Rf = 1 MΩ ±20%

C1 = C2 = 33 pF ±20%

Rf = 20 kΩ ±1%

Notes: 1. Since the circuit constants change depending on the ceramic oscillator and stray capacitance of

the board, the user should consult with the ceramic oscillator manufacturer to determine the

circuit parameters.

2. Wiring among OSC1, OSC2, and elements should be as short as possible, and must not cross

other wiring (see figure 18).

40

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