DS1307N
64 X 8 Serial Real Time Clock
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)
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.
DS1307 BLOCK DIAGRAM Figure 1
