IDT1339 Integrated Device Technology, IDT1339 Datasheet
IDT1339
Manufacturer Part Number
IDT1339
Description
Real-time Clock With Serial I 2c Interface
Manufacturer
Integrated Device Technology
Datasheet
1.IDT1339.pdf
(29 pages)
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REAL-TIME CLOCK WITH SERIAL I
General Description
The IDT1339 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
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 IDT1339 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
•
•
•
•
•
•
Block Diagram
IDT™ REAL-TIME CLOCK WITH SERIAL I
Handhelds (GPS, POS terminals)
Consumer Electronics (Set-Top Box, Digital Recording,
Network Applications)
Office (Fax/Printers, Copiers)
Medical (Glucometer, Medicine Dispensers)
Telecomm (Routers, Switches, Servers)
Other (Thermostats, Vending Machines, Modems, Utility
Meters)
for 16-pin SOIC ONLY
Crystal inside package
GND
VCC
SDA
V
SCL
BAT
X1
X2
2
C INTERFACE
Interface
Control
Oscillator and
Power
32.768 kHz
I
2
Divider
C
2
C bus. The
2
C INTERFACE
Control
Logic
8.192 kHz/32.768 kHz
1 Hz/4.096 kHz/
1
Features
•
•
•
•
•
•
•
•
•
Control
1 Byte
Real-Time Clock (RTC) counts seconds, minutes, hours,
day, date, month, and year with leap-year compensation
valid up to 2100
Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC
(surface-mount package with an integrated crystal)
I
Two time-of-day alarms
Programmable square-wave output
Operating voltage (see “Product Lineup” table below)
Oscillator stop flag
Automatic power-fail detect and switch circuitry
Trickle-charge capability
2
C Serial interface
Clock, Calendar
7 Bytes
Counter
Buffer
Charger
Alarm/
Trickle
Buffer
MUX/
IDT1339
SQW/INT
DATASHEET
IDT1339
REV H 112008
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