DS1302 Trickle-Charge Real-Time Clock IC
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Prices updated: 13 Oct 2026
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About this product
The DS1302 is a real-time clock/calendar IC with 31 bytes of static RAM, communicating through a simple three-wire serial interface. It tracks seconds through years with leap-year correction and supports trickle-charging for a backup battery, making it popular in data loggers and hobby clocks.
Specifications
- Function
- Real-time clock/calendar / ساعة وتقويم فعلي
- RAM
- 31 bytes static RAM / 31 بايت ذاكرة RAM ثابتة
- Interface
- 3-wire serial (CE, I/O, SCLK) / تسلسلية بثلاثة أسلاك
- Clock format
- 24-hour or 12-hour with AM/PM / 24 ساعة أو 12 ساعة مع AM/PM
- Backup charging
- Trickle-charge capability / قدرة على الشحن المستمر
- Package
- 8-pin DIP / SOIC
Frequently asked questions
Which pins do I connect to a microcontroller?
Connect CE (reset), I/O (data) and SCLK (clock) to three digital pins, plus VCC and GND. The interface is synchronous serial.
Does it keep time when the main power is off?
Yes, if a backup battery is connected to the backup supply pin (Vcc2) as described in the datasheet, the clock keeps running during power loss.
