DS1307 Datasheet, PDF (1/11 Pages) Dallas Semiconductor – 64 X 8 Serial Real Time Clock

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FEATURES
Real time clock counts seconds, minutes,
hours, date of the month, month, day of the
week, and year with leap year compensation
valid up to 2100
56 byte nonvolatile RAM for data storage
2-wire serial interface
Programmable squarewave output signal
Automatic power-fail detect and switch
circuitry
Consumes less than 500 nA in battery backup
mode with oscillator running
Optional industrial temperature range
-40°C to +85°C
Available in 8-pin DIP or SOIC
Recognized by Underwriters Laboratory
ORDERING INFORMATION
DS1307
8-Pin DIP
DS1307Z
8-Pin SOIC (150 mil)
DS1307N
8-Pin DIP (Industrial)
DS1307ZN
8-Pin SOIC (Industrial)
DS1307
64 X 8 Serial Real Time Clock
PIN ASSIGNMENT
X1 ^l
8 V_CC
X2 ^{2 7} SQW/OUT
VBAT 3 6 _SCL
GND ^{4 5} SDA
DS1307 8-Pin DIP (300 mil)
X1 l
8 VCC
X2 2 7 SQW/OUT
VBAT _{3 6 SCL}
GND 4 5 SDA
DS1307Z 8-Pin SOIC (150 mil)
PIN DESCRIPTION
V_CC
X1, X2
- Primary Power Supply
- 32.768 kHz Crystal Connection
V_BAT
GND
- +3V Battery Input
- Ground
SDA
- Serial Data
SCL
- Serial Clock
SQW/OUT - Square wave/Output Driver
DESCRIPTION
The DS1307 Serial Real Time Clock is a low power, full BCD clock/calendar plus 56 bytes of
nonvolatile SRAM. Address and data are transferred serially via a 2-wire bi-directional bus. The
clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the
month date is automatically adjusted for months with less than 31 days, including corrections for leap
year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1307
has a built-in power sense circuit which detects power failures and automatically switches to the battery
supply.
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