MAXIM DS1307 User Manual
V
CC
SCL
SDA
X1
X2
V
BAT
GND
SQW/OUT
V
CC
SCL
SDA
X1
X2
V
BAT
GND
SQW/OUT
PDIP (300 mils)SO (150 mils)
TOP VIEW
DS1307+
0°C to +70°C
5.0
8 PDIP (300 mils)
DS1307
DS1307N+
DS1307Z+
DS1307ZN+
-40°C to +85°C
5.0
8 SO (150 mils)
DS1307N
DS1307Z+T&R
0°C to +70°C
5.0
8 SO (150 mils) Tape and Reel
DS1307
DS1307ZN+T&R
DS130
CPU
SDA
SCL
GND
X1
CC
R
R
CRYSTAL
V
R
PU
= t r /C
b
DS1307
Time Clock
64 x 8, Serial, I2C Real-
GENERAL DESCRIPTION
The DS1307 serial real-time clock (RTC) is a lowpower, full binary-coded decimal (B CD) cl oc k/c alendar
plus 56 bytes of NV SRAM. Address and data are
transferred serially through an I
2
C, bidirectional bus.
The clock/calendar provides seconds, mi nutes, hours,
day, date, month, and year information. The end of
the month date is automatically adjusted for months
with fewer than 31 d ays, i ncl uding c orrecti ons f or l eap
year. The cl ock operates in either the 24-hour or 12hour format wit h AM/PM indicator. T he DS1307 has a
built-in power-sense ci rcuit that detects power failur es
and automatically switches to the backup supply.
Timekeeping operation continues while the part
operates from the back up suppl y .
TYPICAL OPERATING CIRCUIT
V
CC
V
FEATURES
Real-Time Clock (RTC) Counts Seconds,
Minutes, Hours, Dat e of t he 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
2
C Serial Interface
I
Programmable S quar e-Wave Output Signal
Automatic Power-Fail Detect and Switch Circuit r y
Consumes Less than 500nA in B att er y-Backup
Mode with Oscillat or Running
Optional Industrial Temperature Range:
-40°C to +85°C
Available in 8-Pin Plastic DIP or SO
Underwriters Laborat or ies (UL) Recognized
PIN CONFIGURATIONS
V
CC
PU
PU
V
X2
CC
SQW/OUT
BAT
ORDERING INFORMATION
PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE TOP MARK*
-40°C to +85°C 5.0 8 PDIP (300 mils) DS1307N
0°C to +70°C 5.0 8 SO (150 mils) DS1307
-40°C to +85°C 5.0 8 SO (150 mils) Tape and Reel DS1307N
+Denotes a lead-free/RoHS-compliant package.
*A “+” anywhere on the top mark ind ic at es a lea d-free package. An “N” anywhere on the top mark indicates an industrial temperature range
device.
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REV: 100208
DS1307 64 x 8, Serial, I2C Real-Time Clock
Active Supply Curr ent
(f
SCL
= 100kHz)
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pi n Relative to Ground ................................................................................ -0.5V to +7.0V
Operating Temper ature Range (Noncondensing)
Commercial .......................................................................................................................... 0°C to +70°C
Industrial ............................................................................................................................ -40°C to +85°C
Storage Temperature Range ......................................................................................................... -55°C to +125°C
Soldering Temperature (DIP, leads) .................................................................................... +260° C for 10 seconds
Soldering Temperature (surface mount)…..……………………….Refer to the JPC/JEDEC J-STD-020 Specification.
Stresses beyon d those listed u nder “Abs olute M aximu m Rat ings” may cause per manen t dam age to the d evice. T hese ar e stress rating s only ,
and func t ional op erat ion of th e device at t hese or any ot her c o n d it io n s bey ond those indicated in t he op er a t ional sections of the specifica tions is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(TA = 0°C to +70°C, TA = -40°C to +85°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC
Logic 1 Input VIH
Logic 0 Input VIL
V
Battery Voltage V
BAT
BAT
4.5 5.0 5.5 V
2.2 VCC + 0.3 V
-0.3 +0.8 V
2.0 3 3.5 V
DC ELECTRICAL CHARACTERISTICS
(VCC = 4.5V t o 5.5V; TA = 0°C to +70°C, T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Leakage (SCL) ILI -1 1
I/O Leakage (SDA, SQW/O UT) ILO -1 1
Logic 0 Output (IOL = 5mA) VOL 0.4 V
Standby Current I
V
Leakage Current I
BAT
Power-Fail Voltage (V
= 3.0V) VPF
BAT
= -40°C to +85°C.) (Notes 1, 2)
A
I
1.5 mA
CCA
(Note 3) 200
CCS
5 50 nA
BATLKG
1.216 x
V
BAT
1.25 x
V
BAT
1.284 x
V
BAT
µA
µA
µA
V
DC ELECTRICAL CHARACTERISTICS
(VCC = 0V, V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
Current (OS C ON);
BAT
SQW/OUT OFF
V
Current (OS C ON);
BAT
SQW/OUT ON (32kHz)
V
Data-Retention Current
BAT
(Oscillator Off)
WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.
= 3.0V; TA = 0°C to +70°C, T
BAT
= -40°C to +85°C.) (Notes 1, 2)
A
300 500 nA
I
BAT1
480 800 nA
I
BAT2
10 100 nA
I
BATDR
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