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BU9873 Datasheet, PDF (6/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment
BU9873
Datasheet
AC Characteristics
Item
Symbol
VDD ≥1.8V
Min Typ Max
VDD ≥2.5V
Unit
Min Typ Max
SCL Clock Frequency
fSCL
0
-
100
0
-
400 kHz
SCL Clock “L” Time
tLOW
4.7
-
-
1.3
-
-
μs
SCL Clock “H” Time
tHIGH
4.0
-
-
0.6
-
-
μs
Start Condition Hold Time
tHD:STA
4.0
-
-
0.6
-
-
μs
Stop Condition Setup Time
tSU:STO
4.0
-
-
0.6
-
-
μs
Start Condition Setup Time
tSU:STA
4.7
-
-
0.6
-
-
μs
Data Setup Time
tSU:DAT
250
-
-
100
-
-
ns
“H” Data Hold Time
tHDH:DAT
0
-
-
0
-
-
ns
“L” Data Hold Time
tHDL:DAT
35
-
-
35
-
-
ns
SDA “L” Stable Time After Falling of SCL
tPL:DAT
-
-
2.0
-
-
0.9
μs
SDA Off Stable Time After Falling of SCL
tPZ:DAT
-
-
2.0
-
-
0.9
μs
Rising Time of SCL and SDA (Input)
tR
-
- 1000 -
-
300
ns
Falling Time of SCL and SDA (Input)
tF
-
-
300
-
-
300
ns
Spike Width that can be Filtered
tSP
-
-
50
-
-
50
ns
Unless additional specified: VSS=0V, Topt=-40°C to +85°C
(Note1) Not 100% TESTED Condition
Input data level: VIL=0.2×VDD VIH=0.8×VDD
Input data timing reference level: 0.3×VDD/0.7×VDD
Output data timing reference level: 0.3×VDD/0.7×VDD
Rise/Fall time: ≦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