1337CSRI Datasheet, PDF (1/24 Pages) Integrated Device Technology – REAL-TIME CLOCK WITH I2C SERIAL INTERFACE

REAL-TIME CLOCK WITH I²C SERIAL INTERFACE
DATASHEET
IDT1337
General Description
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
data are transferred serially through an I²C bus. The device
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.
Applications
• Telecommunication (Routers, Switches, Servers)
• Handhelds (GPS, POS terminals, MP3 players)
• Set-Top Box, Digital Recording,
• Office (Fax/Printers, Copiers)
• Medical (Glucometer, Medicine Dispensers)
• Other (Thermostats, Vending Machines, Modems, Utility
Meters, Digital Photo Frame devices)
Features
• 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)
• I²C Serial interface (Normal and Fast modes)
• Two time-of-day alarms
• Oscillator Stop Flag
• Programmable square-wave output defaults to 32 kHz on
power-up
• Operating voltage of 1.8 to 5.5 V
• Industrial temperature range (-40 to +85°C)
Block Diagram
Crystal inside package
for 16-pin SOIC ONLY
X1
X2
VCC
32.768 kHz
Oscillator and
Divider
1 Hz/4.096 kHz/
8.192 kHz/32.768 kHz
MUX/
Buffer
Control
Logic
Clock,
Calendar
Counter
SCL
SDA
I²C
Interface
1 Byte 7 Bytes Alarm
Control Buffer Registers
SQW/INTB
INTA
GND
IDT™ REAL-TIME CLOCK WITH I²C SERIAL INTERFACE
1
IDT1337
REV J 111009