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RV5C338A Datasheet(PDF) 43 Page - RICOH electronics devices division

Part No. RV5C338A
Description  3-WIRE SERIAL INTERFACE 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

RV5C338A Datasheet(HTML) 43 Page - RICOH electronics devices division

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R
×5C338A
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.
I/O
CONTROL
SCLK
SIO
CE
2
3
4
Lower limit operating voltage
for the CPU
Backup voltage
0.2
×VDD
MIN. 0
µs MIN. 0µs MIN. 0µs
VDD
CE


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