DS1307
64 X 8 Serial Real Time Clock
www.dalsemi.com
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
PIN ASSIGNMENT
X1
X2
V
BAT
GND
l
2
3
4
8
7
6
5
V
CC
SQW/OUT
SCL
SDA
DS1307 8-Pin DIP (300 mil)
X1
X2
V
BAT
GND
l
2
3
4
8
7
6
5
V
CC
SQW/OUT
SCL
SDA
DS1307Z 8-Pin SOIC (150 mil)
PIN DESCRIPTION
V
CC
X1, X2
V
BAT
GND
SDA
SCL
SQW/OUT
- Primary Power Supply
- 32.768 kHz Crystal Connection
- +3V Battery Input
- Ground
- Serial Data
- Serial Clock
- Square wave/Output Driver
ORDERING INFORMATION
DS1307
DS1307Z
DS1307N
DS1307ZN
8-Pin DIP
8-Pin SOIC (150 mil)
8-Pin DIP (Industrial)
8-Pin SOIC (Industrial)
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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081800
DALLAS [ DALLAS SEMICONDUCTOR ]
