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RV5C338A Datasheet(PDF) 24 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) 24 Page - RICOH electronics devices division

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21
R
×5C338A
USAGES
1. Data Transfer Formats
1.1 Timing Between CE Pin Transition and Data Input/Output
The R
×5C338A adopt a 3-wire serial interface by which it uses the CE (Chip Enable), SCLK (Serial Clock), and SIO
(Serial Input/Output), pins to receive and send data to and from the CPU. The 3-wire serial interface provides two
types of input/output timings with which the output and input from the SIO pin output and input are synchronized
with the rising and falling edges of the SCLK pin input, respectively, and vice versa. The R
×5C338A are configured
to select either one of two different input/output timings depending on the level of the SCLK pin in the low to high
transition of the CE pin. Namely, when the SCLK pin is held low in the low to high transition of the CE pin, the
models will select the timing with which the output and input from the SIO pin are synchronized with the rising and
falling edges of the SCLK pin input, respectively, as illustrated in the timing chart below.
tCES
tDS
tDH
tRD
CE
SCLK
SIO
(Input to the real-time clock)
SIO
(Output from the real-time clock)
Conversely, when the SCLK pin is held high in the low to high transition of the CE pin, the models will select the
timing with which the output and input from the SIO pin are synchronized with the falling and rising edges of the
SCLK pin input, respectively as illustrated in the timing chart below.
tCES
tDS
tDH
tRD
CE
SCLK
SIO
(Input to the real-time clock)
SIO
(Output from the real-time clock)


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