DS1307 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – 64 X 8 Serial Real Time Clock

DS1307
64 x 8, Serial, I²C Real-Time Clock
GENERAL DESCRIPTION
The DS1307 serial real-time clock (RTC) is a low-
power, full binary-coded decimal (BCD) clock/calendar
plus 56 bytes of NV SRAM. Address and data are
transferred serially through an I²C, bidirectional 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 fewer 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 that detects power failures
and automatically switches to the backup supply.
Timekeeping operation continues while the part
operates from the backup supply.
TYPICAL OPERATING CIRCUIT
V_CC
V_CC
V_CC R_PU
R_PU
CRYSTAL
CPU
R_PU = t_r/C_b
X1 X2
V_CC
SCL
SQW/OUT
DS130
SDA
GND
V_BAT
FEATURES
Real-Time Clock (RTC) 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, Battery-Backed, General-Purpose RAM
with Unlimited Writes
I²C Serial Interface
Programmable Square-Wave Output Signal
Automatic Power-Fail Detect and Switch Circuitry
Consumes Less than 500nA in Battery-Backup
Mode with Oscillator Running
Optional Industrial Temperature Range:
-40°C to +85°C
Available in 8-Pin Plastic DIP or SO
Underwriters Laboratories (UL) Recognized
PIN CONFIGURATIONS
TOP VIEW
X1
X2
V_BAT
GND
V_CC
X1
SQW/OUT X2
SCL
SDA
V_BAT
GND
V_CC
SQW/OUT
SCL
SDA
SO (150 mils)
PDIP (300 mils)
ORDERING INFORMATION
PART
TEMP RANGE VOLTAGE (V) PIN-PACKAGE
TOP MARK*
DS1307+
DS1307N+
DS1307Z+
DS1307ZN+
DS1307Z+T&R
DS1307ZN+T&R
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
5.0
8 PDIP (300 mils)
DS1307
5.0
8 PDIP (300 mils)
DS1307N
5.0
8 SO (150 mils)
DS1307
5.0
8 SO (150 mils)
DS1307N
5.0
8 SO (150 mils) Tape and Reel DS1307
5.0
8 SO (150 mils) Tape and Reel DS1307N
+Denotes a lead-free/RoHS-compliant package.
*A “+” anywhere on the top mark indicates a lead-free package. An “N” anywhere on the top mark indicates an industrial temperature range
device.
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REV: 100208