You will need to solder the battery clip (included) and the header (included) on.

Designed using open source schematics, we've replaced the DS1307 with the accurate ISL1208. We had no use for the freq. out pin, but needed an alarm pin to wake our projects from sleep, which is why we chose the ISL1208.

• Real Time Clock/Calendar

• Tracks Time in Hours, Minutes, and Seconds
• Day of the Week, Day, Month, and Year

• 15 Selectable Frequency Outputs • Single Alarm

• Settable to the Second, Minute, Hour, Day of the Week, Day, or Month
• Single Event or Pulse Interrupt Mode

• Automatic Backup to Battery or Super Capacitor • Power Failure Detection • On-Chip Oscillator Compensation • 2 Bytes Battery-Backed User SRAM • I2C Interface

• 400kHz Data Transfer Rate

• 400nA Battery Supply Current • Same Pin Out as ST M41Txx and Maxim DS13xx Devices • Small Package Options

• 8 Ld MSOP and SOIC Packages
• 8 Ld TDFN Package

• Pb-Free Available (RoHS Compliant)