RV5C387A datasheet(36/42 Pages) RICOH

Part #	RV5C387A

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

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RV5C387A

PRELIMINARY

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

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