RS5C313 RICOH Co.,Ltd., RS5C313 Datasheet - Page 17

• Manufacturer Part Number: RS5C313
• Description: Ultra-compact Real-time Clock Ic
• Manufacturer: RICOH Co.,Ltd.

4. Configuration of Oscillating Circuit
The oscillation circuit is driven at a constant voltage of about 1.5 V relative to the V
form having a peak-to-peak amplitude of about 1.5 V on the positive side of the V
R
1) Mount the crystal oscillators and C
2) Avoid laying any signal or power line close to the oscillation circuit (particularly in the area marked with “←A →”
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.
1) When applying an external input of clock pulses (32.768 kHz) to the OSCIN pin:
2) Avoid using the oscillator output of the RS5C313 (from the OSCOUT pin) to drive any other IC for the purpose of
F
DC coupling - - - - - Prohibited due to mismatching input levels.
AC coupling - - - - - Permissible except that unpredictable results may occur in oscillator halt sensing due to
in the above figure).
ensuring stable oscillation.
R
D
C
D
Considerations in Mounting Components Surrounding Oscillating Circuit
7
8
6
possible sensing errors caused by noises, etc.
VDD
OSCOUT
OSCIN
G
A
in the closest possible position to the IC.
Other Relevant Considerations
32kHz
C
G
VDD
VSS
Typical external device:
Standard values of internal devices:
SS
SS
level.
level. Consequently, it generates a wave-
X'tal :
C
R
R
C
G
F
D
D
=15MΩ ( TYP. )
=60kΩ (TYP. )
=10pF (TYP.)
=8pF to 20pF
(R
(C
32.768kHz
1
L
=30kΩ)
=6pF to 8pF)
RS5C313
17