3-WIRE SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
| The RV5C339A is a CMOS real-time clock IC connected to the CPU by three signal lines
CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input/Output), and configured to perform serial transmission
of time and calendar data to the CPU. This model incorporates different functional circuits. The periodic interrupt
circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds
to 1 month. The 2 alarm circuits generate interrupt signals at preset times. The oscillation circuit is driven
under constant voltage so that fluctuations in oscillation frequency due to voltage are small and supply current
is also small (TYP. 0.35µA at 3 volts). The oscillation halt sensing circuit can be used to judge the
validity of internal data in such events as power-on. The supply voltage monitoring circuit is configured to
record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32-kHz
clock output function (Nch. open drain) is intended to output sub-clock pulses for the external microcomputer.
The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations
in the oscillation frequency of the crystal oscillator. This model comes in an ultra-compact 10-pin
SSOP-G (with a height of 1.20mm and a pin pitch of 0.5mm). |
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 Timekeeping
supply voltage ranging from 1.45 to 5.5 volts |
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| Low
supply current |
TYP. 0.35µA (MAX. 0.8µA) at 3 volts (at 25°C) |
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Only
three signal lines (SCLK, SIO, and CE) required for connection to the CPU. Maximum clock frequency of 2 MHz
(with VDD of 5 volts) |
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Time
counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks)
(in BCD format) |
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| 1900/2000
identification bit for Year 2000 compliance |
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Interrupt
circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to the
CPU and provided with an interrupt flag and an interrupt halt circuit |
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2
alarm circuits (Alarm_W for week , hour , and minute alarm settings and Alarm_D for hour and minute alarm settings) |
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32-kHz
clock circuit (Nch. open drain output) Designed to disable 32-kHz clock output in response to a command from
the host computer. |
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Oscillation
halt sensing circuit which can be used to judge the validity of internal data |
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Supply
voltage monitoring circuit with two supply voltage monitoring threshold settings |
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| Automatic
identification of leap years up to the year 2099 |
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| Selectable
12-hour and 24-hour mode settings |
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| Built-in
oscillation stabilization capacitors (CG and CD) |
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| High
precision oscillation adjustment circuit |
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| CMOS
process |
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Ultra-compact 10-pin
SSOP-G (with a height of 1.20mm and size of 4.0×2.9mm) |
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Communication devices(multi function phone, portable phone, PHS
or pager) |
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OA devices(fax, portable fax)
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Computer(desk-top and mobile PC, portable word-processor, PDA, electric note
or video game) |
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AV components (portable audio unit, video camera, camera, digital camera or remote
controller) |
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Home appliances(rice cooker, electric oven) |
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Other(car navigation system, multi-function watch) |
Data Sheet
(PDF) |
Package Info.
(PDF) |
Mark Info.
(PDF) |
Quality Assurance Data
(PDF) |
 RV5C339A
EA-055-0208 (370KB) |
SSOP-10G |
to be prepared |
Reliability |
to be prepared |
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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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