Products > Integrated Circuits (ICs) > RV5C339A-E2-F

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RV5C339A-E2-F Product Details


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 poweron. 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).


· Timekeeping supply voltage ranging from 1.45 to 5.5 volts
· Low supply current: TYP.0.35uA(MAX.0.8uA) at 3 volts (at 25℃)
· Only three signal lines(SCLK, SIO, and CE) required for connection to the CPU.
Maximum clock frequency of 2 MHz(with VDp of 5 volts)
· Time counters(counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks)(in BCD format)
·1900/2000 identification bit for Year 2000 compliance
· 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
·2 alarm circuits(Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute alarm settings)
·32-kHz clock circuit(Nch. open drain output) Designed to disable 32-kHz clock output in response to a command from the host computer.
· Oscillation halt sensing circuit which can be used to judge the validity of internal data
· Supply voltage monitoring circuit with two supply voltage monitoring threshold settings
· Automatic identification of leap years up to the year 2099

· Selectable 12-hour and 24-hour mode settings
· Built-in oscillation stabilization capacitors (CG and CD)
· High precision oscillation adjustment circuit
· CMOS process
· UItra-compact 10-pin SSOPG(with a height of 1.20mm and size of 4.0×2.9mm)


1. Interface with CPU The RV5C339A is connected to the CPU by three signal lines CE(Chip Enable), SCLK (Serial Clock), SIO(Serial Input/Output), through which it reads and write data from and to the CPU. The CPU can access when the CE pin isheld high. Access clock pulses have a maximum frequency of 2MHz (at 5 volts), allowing high-speed data transfer to the CPU.
2. Clock and Calendar Function The RV5C339A reads and writes time data from and to the CPU in units ranging from seconds to the last two digits of the calendar year. The calendar year will automatically be identified as a leap year when its last two digits are a multiple of 4. Also available is the 1900/2000 identification bit for Year 2000 compliance. Consequently, leap years up to the year 2099 can automatically be identified as such.

3. Alarm Function The RV5C339A incorporates an alarm circuit configured to generate interrupt signals to the CPU for output at preset times. The alarm circuit allows two types of alarm settings specified by the Alarm_W registers and the Alarm_D registers. The Alarm W registers allow week, hour, and minute alarm settings including combinations of multiple day-of-week settings such as "Monday, Wednesday, and Friday"and "Saturday and Sunday". The Alarm_D registers allow hour and minute alarm settings. The Alarm_D signal outputs from INTRA pin, and the Alarm_W signal outputs from INTRB pin. The current INTRA or INTRB conditions specified by the flag bits for each alarm function can be checked from the CPU by using polling function.

4. High-precision Oscillation Adjustment Function The RV5C339A has built-in oscilation stabilization capacitors (CG and CD), which can be connected to an external crystal oscillator to configure an oscillation circuit. To correct deviations in the oscillation frequency of the crystal oscillator, the oscillation adjustment circuit is configured to allow correction of a time count gain or loss(up to ±1.5
ppm at 25℃) from the CPU within a maximum range of approximately ±189 ppm in increments of approximately3ppm. Such oscillation frequency adjustment in each system has the following advantages: Allows timekeeping with much higher precision than conventional real-time clocks while using a crystal oscillator with a wide range of precision variations.
Corrects seasonal frequency deviations through seasonal oscillation adjustment.
Allows timekeeping with higher precision particularly in systems with a temperature sensing function through oscillation adjustment in tune with temperature fluctuations.

5. Oscillation Halt Sensing Function and Supply Voltage Monitoring Function The RV5C339A incorporates an oscillation halt sensing circuit equipped with internal registers configured to record any past oscillation halt, thereby identifying whether they are powered on from 0 volts or battery backed-up. As such, the oscillation halt sensing circuit is useful for judging the validity of time data.
The RV5C339A also incorporates a supply voltage monitoring circuit equipped with internal registers configured to record any drop in supply voltage below a certain threshold value. Supply voltage monitoring threshold settings can be selected between 2.1 and 1.6 volts through internal register settings.
The oscilation halt sensing circuit is configured to confirm the established invalidation of time data in contrast to the supply voltage monitoring circuit intended to confirm the potential invalidation of time data. Further, the supply voltage monitoring circuit can be applied to battery supply voltage monitoring.

6. Periodic Interrupt Function The RV5C339A incorporates a periodic interrupt circuit configured to generate periodic interrupt signals aside frominterrupt signals generated by the alarm circuit for output from the INTRA pin. Periodic interrupt signals have five selectable frequency settings of 2Hz(once per 0.5 seconds),1Hz(once per 1 second),1/60Hz(once per 1 minute),
1/3600Hz(once per 1 hour), and monthly(the first day of every month). Further, periodic interrupt signals also have two selectable waveforms of a normal pulse form(with a frequency of 2Hz or 1Hz) and special form adapted to interruption from the CPU in the level mode(with second, minute, hour, and month interrupts). The condition of periodic interrupt signals can be monitored by using a polling function.
7.32-kHzClock Output Function The RV5C339A incorporates a 32-kHz clock circuit configured to generate clock pulses with the oscillation frequency of a 32.768-kHz crystal oscillator for output from the 32KOUT pin. The 32KOUT pin is Nch. open drain output.
The 32-kHz clock output can be disabled by certain register settings But it cannot be disabled without manipulation of any two registers with different addresses, to prevent disabling in such events as the runaway of the CPU.


RV5C339A-E2-F Block Diagram
(Picture: Diagram)

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2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


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Q: Are the RICOH's RV5C339A-E2-F price and stock displayed on the platform accurate?
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Q: What is the process for returns or replacement of RV5C339A-E2-F?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the RV5C339AE2F we delivered, we will accept the replacement or return of the RV5C339A-E2-F only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of RV5C339A-E2-F.
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Ricoh Americas Corporation

Ricoh microelectronics is a wholly-owned subsidiary of ricoh group, one of the world's top 500 companies. Ricoh microelectronics: ricoh products with high performance and high reliability are highly recognized by the market. Committed to a variety of highly integrated power management IC, lithium...
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