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R2045S Datasheet(PDF) 6 Page - RICOH electronics devices division

Part No. R2045S
Description  4-wire Serial Interface Real Time Clock Module
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Maker  RICOH [RICOH electronics devices division]
Homepage  http://www.ricoh.com
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R2045S Datasheet(HTML) 6 Page - RICOH electronics devices division

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R2045S/D
6
AC ELECTRICAL CHARACTERISTICS
Unless otherwise specified: VSS=0V,Topt=-40 TO +85
°C
Input / Output condition: VIH=0.8xVDD,VIL=0.2xVDD,VOH=0.8xVDD,VOL=0.2xVDD,CL=50pF
VDD
≥1.7V
Symbol
Item
Condi-
tions
Min.
Typ.
Max.
Unit
tCES
CE Set-up Time
400
ns
tCEH
CE Hold Time
400
ns
tCR
CE Recovery Time
62
µs
fSCLK
SCLK Clock Frequency
1.0
MHz
tCKH
SCLK Clock High Time
400
ns
tCKL
SCLK Clock Low Time
400
ns
tCKS
SCLK Set-up Time
200
ns
tRD
Data Output Delay Time
300
ns
tRZ
Data Output Floating Time
300
ns
tCEZ
Data Output Delay Time
After Falling of CE
300
ns
tDS
Input Data Set-up Time
200
ns
tDH
Input Data Hold Time
200
ns
SCLK
tCES
SI
CE
tRD
tCKL
tCEZ
tDS
tDH
tRD
tCEH
tCKH
tCKS
tCR
tRZ
SO
*)
For reading/writing timing, see “P.26
•Considerations in Reading and Writing Time Data under special
condition”.


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