Dallas Semiconductor

DS1307 - 3-Wire/SPI Serial Interface Trickle Charge Real-Time Clock

Photograph

Features Real-time clock counts seconds, minutes, hours, date, month, day, year, and leap year to 2100 56-bytes general-purpose NV RAM Accuracy > 2 minutes/month at 25oC Automatic power management circuitry 2-wire serial interface Programmable square wave output signal Uses <300nA in backup mode with oscillator running

Pin Description Pin Number Description 1 X1 - 32.768kHz Crystal Connection 2 X2 - 32.768kHz Crystal Connection 3 Vbat - +3V Battery Input 4 GND - Ground 5 SDA - Serial Data 6 SCLK - Serial Clock 7 SQW/OUT - Squarewave Output 8 Vcc - Primary Power Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Dallas Semiconductor - Data Sheet for DS1307 Application Notes Interfacing the DS1307 with an 8051-Compatible Microcontroller Crystal Considerations with Dallas Real-Time Clocks Using the DS32kHz with Dallas RTC's Design Considerations for Dallas Real-Time Clocks