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RS5C372A Datasheet(PDF) 13 Page - RICOH electronics devices division

Part No. RS5C372A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RS5C372A Datasheet(HTML) 13 Page - RICOH electronics devices division

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RS5C372B
9
PIN DESCRIPTIONS
Pin No.
Symbol
Name
Description
2
SCL
Serial Clock Line
This pin is used to input shift clock pulses to synchronize data input/output to and
from the SDA pin with this clock. Up to 6V beyond VDD may be input.
3
SDA
Serial Data Line
This pin inputs and outputs written or read data in synchronization with shift clock
pulses from the SCL pin. Up to 6V beyond VDD may be input. This pin functions
as an Nch open drain output.
5
INTR
Interrupt Output
This pin outputs periodic interrupt pulses and alarm interrupt (Alarm_A, Alarm_B)
to the CPU. This pin is off when power is activated from 0V. This pin functions as
an Nch open drain output.
1
32KOUT
32-kHz Clock Output
The 32KOUT pin is used to output 32.768kHz clock pulses (when 32.768kHz crys-
tal is used). Enabled at power-on from 0volts. CMOS output. The RS5C372B can
disable 32-kHz clock output in response to a command from the host computer.
7
OSCIN
Oscillator Circuit
6
OSCOUT
Input/Output
8
VDD
Positive Power Supply Input
4
VSS
Negative Power Supply Input
These pins configure an oscillator circuit by connecting a 32.768kHz or 32.000kHz
crystal oscillator between the OSCIN–OSCOUT pins.
(Any other oscillator circuit components are built into the RS5C372A.)
The VDD pin is connected to the positive power supply and VSS to the ground.
ABSOLUTE MAXIMUM RATINGS
(Vss=0V)
Symbol
Item
Conditions
Ratings
Unit
VDD
Supply Voltage
–0.3 to +7.0
V
VI
Input Voltage
SCL, SDA
–0.3 to +7.0
V
Output Voltage 1
SDA
–0.3 to +7.0
VO
Output Voltage 2
INTR
–0.3 to +12
V
Output Voltage 3
32KOUT
–0.3 to VDD+0.3
PD
Power Dissipation
Topt=25˚C
300
mW
Topt
Operating Temperature
–40 to +85
˚C
Tstg
Storage Temperature
–55 to +125
˚C
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.


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