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DS1337S

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
AVAILABLE
Functional Diagrams
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and
ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4652; 7/09
DS1337
GENERAL DESCRIPTION
The DS1337 serial real-time clock is a low-power
clock/calendar with two programmable time-of-day
alarms and a programmable square-wave output.
Address and data are transferred serially through an
I
2
C bus. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year
information. The date at the end of the month 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 device is fully accessible through the serial
interface while V
CC
is between 1.8V and 5.5V. I
2
C
operation is not guaranteed below 1.8V.
Timekeeping operation is maintained with V
CC
as low
as 1.3V.
APPLICATIONS
Handhelds (GPS, POS Terminal, MP3 Player)
Consumer Electronics (Set-Top Box, VCR/Digital
Recording)
Office Equipment (Fax/Printer, Copier)
Medical (Glucometer, Medicine Dispenser)
Telecommunications (Router, Switch, Server)
Other (Utility Meter, Vending Machine, Thermostat,
Modem)
TYPICAL OPERATING CIRCUIT
FEATURES
Real-Time Clock (RTC) Counts Seconds,
Minutes, Hours, Day, Date, Month, and Year
with Leap-Year Compensation Valid Up to
2100
Available in a Surface-Mount Package with an
Integrated Crystal (DS1337C)
I
2
C Serial Interface
Two Time-of-Day Alarms
Oscillator Stop Flag
Programmable Square-Wave Output
Defaults to 32kHz on Power-Up
Available in 8-Pin DIP, SO, or SOP
-40C to +85C Operating Temperature Range
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
TOP
MARK†
DS1337+ -40°C to +85°C 8 DIP (300 mils) DS1337
DS1337S+ -40°C to +85°C 8 SO (150 mils) DS1337
DS1337U+ -40°C to +85°C
8 SOP
1337
DS1337C# -40°C to +85°C 16 SO (300 mils) DS1337C
+ Denotes a lead(Pb)-free/RoHS-compliant device.
# Denotes a RoHS-compliant device that may include lead that is
exempt under the RoHS requirements. The lead finish is JESD97
category e3, and is compatible with both lead-based and lead-free
soldering processes.
† A “+” anywhere on the top mark denotes a lead-free device. A
“#” denotes a RoHS-compliant device.
Pin Configurations appear at end of data sheet.
I
2
C Serial Real-Time Clock
www.maxim-ic.com
DS1337 I
2
C Serial Real-Time Clock
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground…………………………………………………………...…-0.3V to +6.0V
Operating Temperature Range (Noncondensing)………………………………………………………….-40°C to +85°C
Storage Temperature Range………………………………………………………………………………..-55°C to +125°C
Soldering Temperature…………………………………………………………See IPC/JEDEC J-STD-020 Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= -40°C to +85°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Full operation 1.8 3.3 5.5 V
V
CC
Supply Voltage
V
CCT
Timekeeping (Note
5)
1.3 1.8 V
SCL, SDA 0.7 x V
CC
V
CC
+ 0.3
Logic 1 V
IH
INTA, SQW/INTB
5.5
V
Logic 0 V
IL
-0.3 +0.3 x V
CC
V
DC ELECTRICAL CHARACTERISTICS—Full Operation
(V
CC
= 1.8V to 5.5V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Leakage I
LI
(Note 2) -1 +1
A
I/O Leakage I
LO
(Note 3) -1 +1
A
Logic 0 Output (V
OL
= 0.4V) I
OL
(Note 3) 3 mA
Active Supply Current I
CCA
(Note 4) 150
A
Standby Current I
CCS
(Notes 5, 6) 1.5
A
DC ELECTRICAL CHARACTERISTICS--Timekeeping
(V
CC
= 1.3V to 1.8V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Timekeeping Current
(Oscillator Enabled)
I
CCTOSC
(Notes 5, 7, 8, 9) 425 600 nA
Data-Retention Current
(Oscillator Disabled)
I
CCTDDR
(Notes 5, 9) 100 nA
DS1337 I
2
C Serial Real-Time Clock
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 1.8V to 5.5V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Fast mode 100 400
SCL Clock Frequency f
SCL
Standard mode 0 100
kHz
Fast mode 1.3
Bus Free Time Between a
STOP and START Condition
t
BUF
Standard mode 4.7
s
Fast mode 0.6
Hold Time (Repeated)
START Condition (Note 10)
t
HD:STA
Standard mode 4.0
s
Fast mode 1.3
LOW Period of SCL Clock t
LOW
Standard mode 4.7
s
Fast mode 0.6
HIGH Period of SCL Clock t
HIGH
Standard mode 4.0
s
Fast mode 0.6
Setup Time for a Repeated
START Condition
t
SU:STA
Standard mode 4.7
s
Fast mode 0 0.9 Data Hold Time
(Notes 11, 12)
t
HD:DAT
Standard mode 0
s
Fast mode 100
Data Setup Time (Note 13) t
SU:DAT
Standard mode 250
ns
Fast mode 20 + 0.1C
B
300
Rise Time of Both SDA and
SCL Signals (Note 14)
t
R
Standard mode 20 + 0.1C
B
1000
ns
Fast mode 20 + 0.1C
B
300
Fall Time of Both SDA and
SCL Signals (Note 14)
t
F
Standard mode 20 + 0.1C
B
300
ns
Fast mode 0.6
Setup Time for STOP
Condition
t
SU:STO
Standard mode 4.0
s
Capacitive Load for Each Bus
Line
C
B
(Note 14) 400 pF
I/O Capacitance (SDA, SCL) C
I/O
(Note 15) 10 pF
Oscillator Stop Flag (OSF)
Delay
t
OSF
100 ms
Note 1: Limits at -40°C are guaranteed by design and are not production tested.
Note 2:
SCL only.
Note 3:
SDA, INTA, and SQW/INTB.
Note 4: I
CCA
—SCL clocking at max frequency = 400kHz, V
IL
= 0.0V, V
IH
= V
CC.
Note 5: Specified with the I
2
C bus inactive, V
IL
= 0.0V, V
IH
= V
CC.
Note 6: SQW enabled.
Note 7: Specified with the SQW function disabled by setting INTCN = 1.
Note 8: Using recommended crystal on X1 and X2.
Note 9:
The device is fully accessible when 1.8 V
CC
5.5V. Time and date are maintained when 1.3V V
CC
1.8V.
Note 10: After this period, the first clock pulse is generated
Note 11: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IHMIN
of the SCL signal) to
bridge the undefined region of the falling edge of SCL.
Note 12: The maximum t
HD:DAT
need only be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 13:
A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
to 250ns must then be met. This is
automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW
period of the SCL signal, it must output the next data bit to the SDA line t
R max
+
t
SU:DAT
= 1000 + 250 = 1250ns before the SCL
line is released.
Note 14: C
B
—total capacitance of one bus line in pF.
Note 15: Guaranteed by design. Not production tested.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

DS1337S

Mfr. #:
Buy DS1337S
Manufacturer:
Maxim Integrated
Description:
Real Time Clock I2C Serial RTC
Lifecycle:
New from this manufacturer.
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