Integrated Circuits

DS1307
64 x 8, serial, I2C real-time clock
PDF datasheet
       
X1 1  • 8 Vcc
X2 2 7 SQW/OUT
VBAT 3 6 SCL
GND 4 5 SDA
       
Pin Symbol Description
1 X1 32.768kHz crystal connection
2 X2 32.768kHz crystal connection
3 VBAT backup supply voltage (e.g. 3V lithium coin cell)
4 GND ground
5 SDA serial data input/output
6 SCL serial clock input
7 SQW/OUT square wave output
8 Vcc primary supply voltage

Notes
  • A lithium battery with 48 mAh or greater will back up the DS1307 for more than 10 years.
  • Square wave output can be 1Hz, 4.096kHz, 8.192kHz, or 32.768kHz.
  • Reads/writes are inhibited when Vcc falls below 1.25 x VBAT .

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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