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RV5C387A-E2 Datasheet(PDF) 36 Page - RICOH electronics devices division

Part No. RV5C387A-E2
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

RV5C387A-E2 Datasheet(HTML) 36 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
12345
- 36 -
14.6.2.
Connection of /INTRA, /INTRB, and /INTRC Pin
The /INTRA, /INTRB, and /INTRC 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, /INTRB, or
/INTRC
*1)
32768Hz
B
A
Backup power supply
System power supply
VSS
14.6.3.
Connection of 32KOUT Pin
The 32KOUT pin follows the Nch. open drain output and contains no protective diode on the power supply
side.
As such, it can be connected to a device with a supply voltage of up to 5.5 volts regardless of supply
voltage, provided that such connection involves considerations for the supply current requirements of a
pull-up resistor, which can be roughly calculated by the following equation:
I = 0.5
× (VDD or VCC) / Rp
VDD
OSCIN
OSCOUT
32KOUT
VSS
32768Hz
B
Rp
Backup power supply
(VDD)
System power supply (VCC)
A
*1)
*1) Depending on whether the /INTRA, /INTRB, and
/INTRC 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.
*1) Depending on whether the 32KOUT pin is 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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