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R2023K Datasheet(PDF) 6 Page - RICOH electronics devices division

Part No. R2023K
Description  2-wire Serial Interface Real Time Clock IC
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Maker  RICOH [RICOH electronics devices division]
Homepage  http://www.ricoh.com
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R2023K Datasheet(HTML) 6 Page - RICOH electronics devices division

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R2023K/T
6
AC ELECTRICAL CHARACTERISTICS
Unless otherwise specified: VSS=0V,Topt=-40 to +85
°C
Input and Output Conditions: VIH=0.8
×VDD,VIL=0.2×VDD,VOH=0.8×VDD,VOL=0.2×VDD,CL=50pF
VDD
≥1.7V *1)
Sym
-bol
Item
Condi-
Tions
Min.
Typ.
Max.
Unit
fSCL
SCL Clock Frequency
400
kHz
tLOW
SCL Clock Low Time
1.3
µs
tHIGH
SCL Clock High Time
0.6
µs
tHD;STA
Start Condition Hold Time
0.6
µs
tSU;STO
Stop Condition Set Up Time
0.6
µs
tSU;STA
Start Condition Set Up Time
0.6
µs
tSU;DAT
Data Set Up Time
200
ns
tHD;DAT
Data Hold Time
0
ns
tPL;DAT
SDA “L” Stable Time
After Falling of SCL
0.9
µs
tPZ;DAT
SDA off Stable Time
After Falling of SCL
0.9
µs
tR
Rising Time of SCL and SDA
(input)
300
ns
tF
Falling Time of SCL and SDA
(input)
300
ns
tSP
Spike Width that can be
removed with Input Filter
50
ns
tRCV
Recovery Time from Stop
Condition to Start Condition
62
µs
*) For reading/writing timing, see “P.28 Interfacing with the CPU
•Data Transmission under Special Conditions”.
SDA(OUT)
SCL
S
Sr
P
tPZ;DAT
tHIGH
tSU;DAT
tHD;STA
tSP
tSU;STO
tLOW
tSU;STA
SDA(IN)
tHD;STA
tPL;DAT
Sr
P
Stop Condition
S
Start Condition
Repeated Start Condition
tHD;DAT


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