RS5C321A Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C321A

ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz

RICOH Co.,Ltd. 

URTRA-COMPACT ALARM REAL-TIME

CLOCK ICs WITH 32.768kHz

RS5C321A/B

OUTLINE

The RS5C321A/B are CMOS type real-time clock ICs which are connected to the CPU via three signal lines and

capable of serial transmission of clock and calendar data to the CPU.

The RS5C321A/B can generate 32.768kHz clock pulse controled by register. Driving an oscillation circuit at con-

stant voltage, the circuit presents less fluctuations in frequency and current consumption thank to its minimal volt-

age fluctuations consequently realizes low current consumption (0.6µA at 3V). 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 RS5C321A/B are the optimum choice for equipment requiring small

size and low power consumption.

The RS5C321A and the RS5C321B reads/writes data at falling and rising edge of serial clock respectively.

FEATURES

• Time keeping voltage 1.6V to 6.0V

• Lowest supply current 0.6µA TYP. (1.5µA MAX.) at 3V

• Connection to the CPU via only three pins: CE, SCLK/SCLK and SIO for addressing and data read/write

• A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years,

months, days, and days of the week) in BCD code

• 32.768kHz clock pulse controled by register.

• 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)

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