DATASHEET
REAL-TIME CLOCK WITH I2C SERIAL INTERFACE
IDT1337
General Description
Features
The IDT1337 device is a low power serial real-time clock
(RTC) device with two programmable time-of-day alarms
and a programmable square-wave output. Address and
• Real-Time Clock (RTC) counts seconds, minutes, hours,
day, date, month, and year with leap-year compensation
valid up to 2100
2
data are transferred serially through an I C bus. The device
• Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC
(surface-mount package with an integrated crystal)
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.
2
• I C Serial interface (Normal and Fast modes)
• Two time-of-day alarms
• Oscillator Stop Flag
Applications
• Programmable square-wave output defaults to 32 kHz on
power-up
• Telecommunication (Routers, Switches, Servers)
• Handhelds (GPS, POS terminals, MP3 players)
• Set-Top Box, Digital Recording,
• Operating voltage of 1.8 to 5.5 V
• Industrial temperature range (-40 to +85°C)
• Office (Fax/Printers, Copiers)
• Medical (Glucometer, Medicine Dispensers)
• Other (Thermostats, Vending Machines, Modems, Utility
Meters, Digital Photo Frame devices)
Block Diagram
VCC
Crystal inside package
for 16-pin SOIC ONLY
1 Hz/4.096 kHz/
8.192 kHz/32.768 kHz
X1
SQW/INTB
INTA
MUX/
Buffer
32.768 kHz
Oscillator and
Divider
X2
Clock,
Calendar
Counter
Control
Logic
SCL
SDA
I2C
Interface
Alarm
Registers
1 Byte 7 Bytes
Control
Buffer
GND
2
IDT™ REAL-TIME CLOCK WITH I C SERIAL INTERFACE
1
IDT1337
REV H 120208
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
