ULTRA-COMPACT ALARM REAL-TIME CLOCK ICs WITH 32.768kHz
Outline
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[This product was discontinued at the end of Jul. 2009.] |
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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
constant voltage, the circuit presents less fluctuations in frequency and current consumption thank to its
minimal voltage 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
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[This product was discontinued at the end of Jul. 2009.]
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 Time
keeping voltage |
1.6V to 6.0V |
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| Lowest
supply current |
0.6µA TYP. (1.5µA MAX.) at 3V |
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Connection
to the CPU via only three pins: CE, SCLK/SCLK and SIO for addressing and data read/write |
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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 |
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| 32.768kHz
clock pulse controled by register. |
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| Oscillator
halt sensing to judge internal data validity |
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| Second
digit adjustment by ±30 seconds |
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| 12-hour
or 24-hour time display selectable |
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| Automatic
leap year recognition up to the year 2099 |
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| CMOS
logic |
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| Package |
8pin SSOP (0.65mm
pitch) |
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Applications
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[This product was discontinued at the end of Jul. 2009.] |
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Communication equipment (Multi-function telephone, portable telephone,
PHS, pager) |
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Business machines (Facsimile, portable facsimile)
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Personal computer (Desktop type, notebook type, word processor, PDA, electronic
notebook, TV games) |
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Audio visual equipment (Portable audio equipment, video camera, camera, digital
camera, remote control equipment) |
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Home use (Rice cooker, microwave range) |
Documents Download
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[This product was discontinued at the end of Jul. 2009.] |
Data Sheet
(PDF) |
Package Info.
(PDF) |
Mark Info.
(PDF) |
Quality Assurance Data
(PDF) |
 RS5C321A/B
EA-040-0208 (255KB) |
SSOP-8 |
to be prepared |
Reliability |
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| * All PDF files are less than 1MB unless otherwise stated. |
| * If you don't have Adobe Reader, you can download free. |
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Product Catalog
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| Selection guide is available for download in PDF format. |
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Non-promotion / Discontinued Products
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