RV5C387A_03 datasheet(43/49 Pages) RICOH | I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

Part #	RV5C387A

Description	I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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RV5C387A

6.2 Connection of INTRA, INTRB or INTRC Pin

The INTRA, INTRB or INTRC pin follows 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.

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

System power supply

RV5C387A

32.768kHz

A

B

OSCIN

OSCOUT

V

DD

V

SS

INTRA or INTRB or INTRC

Backup power supply

*

1

OSCIN

OSCOUT

VDD

VSS

32KOUT

System power supply (VCC)

A

B

Backup battery

32.768kHz

Rp

(VDD)

RV5C387A

*

1

*1) Depending on whether the INTRA, INTRB or INTRC 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.

*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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RV5C387A Datasheet(PDF) 43 Page - RICOH electronics devices division

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Similar Part No. - RV5C387A_03

Similar Description - RV5C387A_03

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