ULTRA-COMPACT
REAL-TIME CLOCK IC
RS5C313
1
OUTLINE
The RS5C313 is a CMOS type real-time clock which is connected to the CPU via three signal lines and capable of
serial transmission of clock and calendar data to the CPU. The RS5C313 can generate various interrupt clock pulses
lasting for long periods (one month). Driving an oscillation circuit at constant voltage, the circuit undergoes few
voltage fluctuations and consequently realizes low current consumption (TYP. 0.7µA at 3 V). It also provides an
oscillator halt sensing function for application to data validity at power-on and other occasions. Integrated into an
ultra-compact and ultra-thin 8pin SSOP (0.65mm pitch), the RS5C313 is the optimum choice for equipment requir-
ing small size and low power consumption.
There is RS5C314 reversing the logic of serial clock for series goods.
• Time Keeping Supply Voltage: 1.6 to 6.0 V
• Operating Supply Voltage: 2.7 to 6.0 V
• Low Current Consumption: TYP. 0.7µA (MAX. of 1.5µA) at 3V
• Connection to the CPU via only three pins: CE, SCLK, and SIO (for addressing and data read and write opera
-
tions)
• A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years,
months, days, and days of the week) in binary-coded decimal (BCD) code
• Generation of interrupt pulses to the CPU with cycles ranging from 1 month to 1/1024 Hz, interrupt flags, and
interrupt halt
• Software-based alarming through clock-interlocked interrupt operation
• Oscillator halt sensing to judge internal data validity
• Second digit adjustment by ±30 seconds
• 12-hour or 24-hour time display selectable
• Automatic leap year recognition up to the year 2099
• CMOS logic
• Package: 8pin SSOP (0.65mm pitch)
FEATURES
NO.EA-034-0208
Non-promotion
NO.EA-034-120404
RS5C313
2
APPLICATIONS
• Communication equipment (Multi-function telephone, portable telephone, PHS, Pager)
• Office automation (Facsimile, portable facsimile)
• Personal computer (Desk top type, notebook type, word proccesor, PDA, electronic notebook, TV games)
• Audio visual equipment (Portable audio equipment, video camera, camera, digital camera, remote control equip-
ment)
• Home use (Rice cooker, microwave range)
PIN CONFIGURATION
1
2
3
4
CE
SCLK
SIO
VSS
8
7
6
5
VDD
OSCIN
OSCOUT
INTR
• 8pin SSOP
BLOCK DIAGRAM
SEC. MIN. HOUR WEEK DAY
MONTH
YEAR
OSCIN
OSCOUT
VDD
VSS
INTR
OSC DIV
OSC
DETECT
VOLTAGE
REGULATOR
ADDRESS
DECODER
INTERRUPT
CONTROL
SHIFT REGISTER
I/O
CONTROL
ADDRESS
REGISTER
SIO
SCLK
CE
TIME COUNTER
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