Rx5C338A Series
3-wire Serial Interface Real Time Clock (RTC)
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Description
The Rx5C338A are CMOS real-time clock ICs 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. These models incorporate 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. 0.35 µA 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 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. SSOP10 and SSOP10G packages are available.
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Spec
Timekeeping Supply Voltage Range 1.45 V to 5.50 V Supply Current 0.35 µA (VDD = 3 V) Connection to CPU Three Signal Lines (SCLK, SIO, CE), Serial Interface, Maximum Clock Frequency: 2 MHz (VDD = 5 V) Clock Output 32.768 kHz (CMOS Output with Control Pin) Package SSOP10, SSOP10G Protections / Functions
ECO Clock Adjust OSC Halt Sensing Supply Voltage Monitoring Circuit Automatic Identification of Leap Years Selectable 12-hour and 24-hour Backup Switch 
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Technical
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Quality &
Packages- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
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Sample / Buy
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Download Datasheet
Functional Description
| ECO | ECO Function |
|---|---|
| Clock Adjust | Clock Adjust Function |
| OSC Halt Sensing | OSC Halt Sensing Function |
| Supply Voltage Monitoring Circuit | Supply Voltage Monitoring Function |
| Automatic Identification of Leap Years | Automatic Identification of Leap Years |
| Selectable 12-hour and 24-hour | Selectable 12-hour and 24-hour |
| Built-in VD with Delay Time | Built-in VD with Delay Time |