BU9873 Datasheet, PDF (4/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment

BU9873
Block Diagram
Datasheet
32KOUT 1
32KOUT
CONTROL
8 VDD
SCL ²
FILTER
SDA 3
VSS 4
FILTER
SDA
CONTROL
I/O
CONTROL
TIME COUNTER
SEC
MIN
HOUR
WEEK
DAY
MONTH
YEAR
ALARM_A
ALARM_B
COMP_A
COMP_B
OSC
DETECT
OSC
DIV
INTRB
CONTROL
7 OCSIN
6 OSCOUT
5 _INTRB
Figure 4. Block diagram
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Remark
Supply Voltage
V_DD
－0.3 to ＋6.5
0.45 (SOP8)
V
When using above Ta=25, decreased by 4.5mW/°C.
0.45 (SOP-J8)
When using above Ta=25, decreased by 4.5mW/°C.
Power Dissipation
Pd
0.33 (TSSOP-B8)
W
When using above Ta=25, decreased by 3.3mW/°C.
0.31 (MSOP8)
When using above Ta=25, decreased by 3.1mW/°C.
Storage
Temperature
Operating
Temperature
0.30 (VSON008X2030)
Tstd
－55 to +125
Topt
－40 to +85
When using above Ta=25, decreased by 3.0mW/°C.
°C
°C
Terminal Voltage
―
-0.3 to V_DD +0.3
The Max value of Terminal Voltage is not over 6.5V.
V
When the pulse width is 50ns or less, the Min value of
Terminal Voltage is not lower than -0.8V.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as
short-circuit modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a
special mode exceeding the absolute maximum ratings
Recommended Operating Conditions
Item
Symbol
Rating
Unit
Supply Voltage
V_DD
1.8 to 5.5
V
Timekeeping
Voltage^{(Note 1)}
V_CLK
1.45 to 5.5
V
Input Voltage
V_IN
0 to V_DD
V
(Note1) For minimum time keeping voltage, C_GOUT = C_DOUT = 0 pF; Quartz crystal unit: C_L (load capacitor) = 6 pF to 12.5 pF, Maximum value of R₁ (equivalent
series resistance) = 80 KΩ.
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TSZ22111・15・001
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TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001