DS1339U-33+T&R ADI芯片 电子元器件中文版规格手册.pdf
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GENERAL DESCRIPTION
The DS1339 serial real-time clock (RTC) is a low-
power clock/date device 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/date 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 DS1339 has a built-in power-
sense circuit that detects power failures and
automatically switches to the backup supply,
maintaining time, date, and alarm operation.
APPLICATIONS
Handhelds (GPS, POS Terminals)
Consumer Electronics (Set-Top Box, Digital
Recording, Network Appliance)
Office Equipment (Fax/Printers, Copier)
Medical (Glucometer, Medicine Dispenser)
Telecommunications (Routers, Switches, Servers)
Other (Utility Meter, Vending Machine, Thermostat,
Modem
)
Pin Configurations appear at end of data sheet.
BENEFITS AND FEATURES
Completely Manages All Timekeeping
Functions
o 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
o Two Time-of-Day Alarms
o Programmable Square-Wave Output
o Oscillator Stop Flag
Interfaces to Most Microcontrollers
o I
2
C Serial Interface
Low-Power Operation Extends Battery
Backup Run Time
o Automatic Power-Fail Detect and
Switch Circuitry
o Trickle-Charge Capability
Underwriters Laboratories® (UL)
Recognized
Surface-Mount Package with an
Integrated Crystal (DS1339C Saves
Additional Space and Simplifies Design
ORDERING INFORMATION
PART
TEMP RANGE
VOLTAGE (V)
PIN-PACKAGE
TOP MARK†
DS1339C-2#
-40°C to +85°C
2.0
16 SO (300 mils)
DS1339C-2
DS1339C-3#
-40°C to +85°C
3.0
16 SO (300 mils)
DS1339C-3
DS1339C-33#
-40°C to +85°C
3.3
16 SO (300 mils)
DS1339C-33
DS1339U-2+
-40°C to +85°C
2.0
8 µSOP
1339 rr-2
DS1339U-3+
-40°C to +85°C
3.0
8 µSOP
1339 rr-3
DS1339U-33+
-40°C to +85°C
3.3
8 µSOP
1339 rr-33
+Denotes a lead(Pb)-free/RoHS-compliant package.
#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 indicates a lead(Pb)-free device. A “#” denotes a RoHS-compliant device. rr = second line, revision code
DS1339
I
2
C Serial Real-Time Clock
19-5770; Rev 3/15
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