The DS1307 is a real-time clock (RTC) IC that is available in an 8 pin DIP package. It transfers data serially via I2C bidirectional protocol.  It is a low power, full binary coded decimal (BCD) clock/calendar with 56bytes of NVRAM. The clock/calendar provides seconds, minutes, hours, day, date, month and year information. The end of the month date is automatically adjusted for months with fewer than 31 days including leap year compensation valid up to 2100. The clock operates in either 24 hours or 12-hour format with AM/PM indicator.

It has a supply voltage range from 4.5V to 5.5V, active supply current of 1.5mA and standby current of 200µA. It has a built-in power sense circuit that detects power failures and automatically switches to backup supply. Timekeeping continues while the device operates from the backup supply such as the coin cell battery. However, you can additionally use a coin cell battery holder for this.

DS1307 pinout:

DS1307 features, specification

Features: -

1. It's a full binary coded decimal clock.
2. Address and data are transferable via microcontroller unit.
3. Operating temperature ranges from -40°C to 85°C
4. Automatic power fails to detect and switch circuitry making time keeping continuous
5. Timekeeping current as low as 300nA
6. Completely manages all time keeping functions without mcu intervention.
7. 56byte, battery backed, general purpose RAM with unlimited writes.
8. A programmable square wave output signal for clock sequence.
9. Simple serial port interfaces to most microcontrollers, I2C specified.
10. Low power operation extends battery backup runtime.
11. Consumes less than 500nA in battery backup mode with oscillator running.

Specification: -

• Package/Case                             :  PDIP-8
• Minimum Supply Voltage (V)       :   4.5
• Maximum Supply Voltage (V)      :   5.5
• Operating Temperature Range (°C)  :  0 to 70
• Communication  :  I2C
• Pin capacitance on I2C load line  :  10 pF
• Mounting Type                :   Through Hole
• RTC Memory Size           :     56 B
• Date and Time Format   :   YY-MM-DD  |  HH:MM:SS

DS1307 Applications:

• Real time clock
• Time keeping
• Digital calendar
• Storage for time and Date
• Clocks without GPS

DS1307 Dimension and footprint:

Example Projects on DS1307:

20+ Projects on DS1307

Additional Resources:

DS1307 Datasheet

Package Contains

1x DS1307