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Dallas
DS1307 - DS1307 Real Time Clock - Buy DS1307
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Photograph
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Features
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 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
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Pin Description
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Pin Number
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Description
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1
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X1 - 32.768kHz Crystal Connection
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2
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X2 - 32.768kHz Crystal Connection
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3
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Vbat - +3V Battery Input
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4
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GND - Ground
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5
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SDA - Serial Data
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6
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SCLK - Serial Clock
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7
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SQW/OUT - Squarewave Output
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8
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Vcc - Primary Power Supply
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Pin Layout
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Dimensional Drawing
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Technical Data
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Data Sheet
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Dallas Semiconductor - Data Sheet for DS1307
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Application Notes
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Interfacing the DS1307 with an 8051-Compatible Microcontroller
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Crystal Considerations with Dallas Real-Time Clocks
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Using the DS32kHz with Dallas RTC's
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Design Considerations for Dallas Real-Time Clocks
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Integrated Circuits