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RV5C386A Datasheet(PDF) 36 Page - RICOH electronics devices division

Part No. RV5C386A
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C386A Datasheet(HTML) 36 Page - RICOH electronics devices division

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RV5C386A
PRELIMINARY
12345
- 36 -
14.6.2.
Connection of /INTRA and /INTRB Pin
The /INTRA and /INTRB pins follow the N-channel open drain output logic and contains no protective diode
on the power supply side.
As such, it can be connected to a pull-up resistor of up to 5.5 volts regardless of
supply voltage.
VDD
OSCIN
OSCOUT
/INTRA or /INTRB
*1)
32768Hz
B
A
Backup power supply
System power supply
VSS
14.6.3.
Connection of 32KOUT Pin
As the 32KOUT pin is CMOS output, the power supply voltage of the RV5C386A and any devices to be
connected to the 32KOUT should be same. When the devices is powered down, the 32KOUT output should
be disabled.
When the CLKC pin is connected to the system power supply through the pull-up resistor, the pull-up resistor
should be 0
Ω to 10kΩ, and the 32KOUT pin should be connect to the host through the resistor (approx.
10k
Ω).
VDD
OSCIN
OSCOUT
CLKC
VSS
32768Hz
System power supply
32KOUT
RN5VL
XXC
Back-up power supply
VDD
OSCIN
OSCOUT
Host
VSS
32768Hz
Back-up power supply
System power supply
Approx. 10K
Ω
32KOUT
0 to10K
Ω
CLKC
*1) Depending on whether the /INTRA and /INTRB
pins are to be used during battery backup, it should
be connected to a pull-up resistor at the following
different positions:
(1) Position A in the left diagram when it is not to be
used during battery backup.
(2) Position B in the left diagram when it is to be used
during battery backup.


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