DS1307 Real Time Clock IC | I2C RTC Calendar Module – SOIC-8

The DS1307 is a widely used Serial Real-Time Clock (RTC) IC that keeps accurate time and date information in a compact SOIC-8 package. Operating via a simple I²C (two-wire) interface, it provides full calendar and clock functions, storing seconds, minutes, hours, day, date, month, and year data in binary-coded decimal (BCD) format.

The DS1307 includes 56 bytes of battery-backed NV SRAM, allowing small data storage even during power loss. With its automatic power-fail detection circuit, the RTC seamlessly switches to the backup battery (VBAT) to maintain timekeeping when the main supply fails.

Capable of running in 12-hour (AM/PM) or 24-hour format, it features a programmable square-wave output, leap-year correction through 2100, and ultra-low power consumption (<500 nA in backup mode). This makes the DS1307 ideal for microcontroller projects, data loggers, embedded systems, clocks, and real-time scheduling applications.

Features / Specifications

• Package: SOIC-8 (150-mil)

• Supply Voltage (VCC): 4.5V – 5.5V

• Backup Battery Voltage (VBAT): 2.0V – 3.5V

• Interface: Two-wire (I2C) serial bus

• SCL Frequency: 100 kHz

• Calendar Functions:

  • Seconds, minutes, hours

  • Day, date, month, year

  • Leap year compensation (up to 2100)

• Nonvolatile Storage: 56-byte battery-backed NV RAM

• Automatic power-fail detect & switch to backup supply

• Programmable square-wave output

• Operating Modes: 12-hour or 24-hour

• Battery-backup current: <500 nA

• Applications:

  • Arduino & MCU timing modules

  • Data loggers

  • Scheduling systems

  • Clocks & time-based automation

  • Embedded electronics

Package Includes:
1 × DS1307 Serial Real Time Clock IC – SOIC-8

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