RS5C313 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C313

ULTRA-COMPACT REAL-TIME CLOCK IC

RICOH Co.,Ltd. 

4. Configuration of Oscillating Circuit

VDD

8

VDD

7 OSCIN

CG

RF

RD

32kHz

6

OSCOUT

CD

A

VSS

RS5C313

Typical external device:

X'tal : 32.768kHz

(R1=30kΩ)

(CL=6pF to 8pF)

CG=8pF to 20pF

Standard values of internal devices:

RF=15MΩ (TYP.)

RD=60kΩ (TYP.)

CD=10pF (TYP.)

The oscillation circuit is driven at a constant voltage of about 1.5 V relative to the VSS level. Consequently, it generates a wave-

form having a peak-to-peak amplitude of about 1.5 V on the positive side of the VSS level.

Considerations in Mounting Components Surrounding Oscillating Circuit

1) Mount the crystal oscillators and CG in the closest possible position to the IC.

2) Avoid laying any signal or power line close to the oscillation circuit (particularly in the area marked with “←A →”

in the above figure).

3) Apply the highest possible insulation resistance between the OSCIN or OSCOUT pin and the PCB.

4) Avoid using any long parallel line to wire the OSCIN or OSCOUT pin.

5) Take extreme care not to cause condensation, which leads to various problems such as oscillation halt.

Other Relevant Considerations

1) When applying an external input of clock pulses (32.768 kHz) to the OSCIN pin:

DC coupling - - - - - Prohibited due to mismatching input levels.

AC coupling - - - - - Permissible except that unpredictable results may occur in oscillator halt sensing due to

possible sensing errors caused by noises, etc.

2) Avoid using the oscillator output of the RS5C313 (from the OSCOUT pin) to drive any other IC for the purpose of

ensuring stable oscillation.

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