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BU9873 Datasheet, PDF (6/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment | |||
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BU9873
Datasheet
AC Characteristics
Item
Symbol
VDD â¥1.8V
Min Typ Max
VDD â¥2.5V
Unit
Min Typ Max
SCL Clock Frequency
fSCL
0
ï¼
100
0
ï¼
400 kHz
SCL Clock âLâ Time
tLOW
4.7
ï¼
ï¼
1.3
ï¼
ï¼
μs
SCL Clock âHâ Time
tHIGH
4.0
ï¼
ï¼
0.6
ï¼
ï¼
μs
Start Condition Hold Time
tHD:STA
4.0
ï¼
ï¼
0.6
ï¼
ï¼
μs
Stop Condition Setup Time
tSU:STO
4.0
ï¼
ï¼
0.6
ï¼
ï¼
μs
Start Condition Setup Time
tSU:STA
4.7
ï¼
ï¼
0.6
ï¼
ï¼
μs
Data Setup Time
tSU:DAT
250
ï¼
ï¼
100
ï¼
ï¼
ns
âHâ Data Hold Time
tHDH:DAT
0
ï¼
ï¼
0
ï¼
ï¼
ns
âLâ Data Hold Time
tHDL:DAT
35
ï¼
ï¼
35
ï¼
ï¼
ns
SDA âLâ Stable Time After Falling of SCL
tPL:DAT
ï¼
ï¼
2.0
ï¼
ï¼
0.9
μs
SDA Off Stable Time After Falling of SCL
tPZ:DAT
ï¼
ï¼
2.0
ï¼
ï¼
0.9
μs
Rising Time of SCL and SDA (Input)
tR
ï¼
ï¼ 1000 ï¼
ï¼
300
ns
Falling Time of SCL and SDA (Input)
tF
ï¼
ï¼
300
ï¼
ï¼
300
ns
Spike Width that can be Filtered
tSP
ï¼
ï¼
50
ï¼
ï¼
50
ns
Unless additional specified: VSS=0V, Topt=ï¼40°C to +85°C
(Note1) Not 100% TESTED Condition
Input data level: VIL=0.2ÃVDD VIH=0.8ÃVDD
Input data timing reference level: 0.3ÃVDD/0.7ÃVDD
Output data timing reference level: 0.3ÃVDD/0.7ÃVDD
Rise/Fall time: â¦20ns
SCL
SDA
(INPUT)
SDA
(OUTPUT)
tR
tHD:STA
tSU:DAT
tF
tHIGH
tLOW
tPL:DAT
tHD:DAT
tPZ:DAT
Figure 5. Input and output timing
SCL
SDA
tSU:STA
tHD:STA
tSU:STO
START BIT
Figure 6. Start and stop condition
STOP BIT
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13.Sep.2013 REV.001
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