RV5C339A datasheet(43/51 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

Part No.	RV5C339A

Description	3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C339A

40

6.4 Connection of CE Pin

Observe the following precautions when you connect the CE pin.

1) The CE pin is configured to enable the oscillation halt sensing circuit only when driven low. As such, it should be

driven low or open at power-on from 0 volts.

2) The CE pin should also be driven low or open immediately upon the host going down (see “1.5 Considerations in

Reading and Writing Time Count Data”).

3) The reading function should be disrupted when the CE signal goes to “low” during read cycle. While, the upper 4

bits of the data might be written to the inner shift register when the CE signal goes to “low” during write cycle.

(Because the writing function is executed 4 bits by 4 bits.) In either case, after the CE signal returns to “High”,

no trouble will occur in the next read or write cycle.

Lower limit operating voltage

for the CPU

Backup voltage

0.2

×VDD

MIN. 0

µs MIN. 0µs MIN. 0µs

VDD

CE

I/O

CONTROL

SCLK

SIO

CE

2

3

7

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