DATASHEET 2 REAL-TIME CLOCK WITH I C SERIAL INTERFACE IDT1337G General Description Features The IDT1337G device is a low power serial real-time clock Real-Time Clock (RTC) counts seconds, minutes, hours, (RTC) device with two programmable time-of-day alarms day, date, month, and year with leap-year compensation and a programmable square-wave output. Address and valid up to 2100 2 data are transferred serially through an I C bus. The device Packaged in 8-pin MSOP, 8-pin SOIC, 16-pin VFQFPN provides seconds, minutes, hours, day, date, month, and (without integrated crystal), or 16-pin SOIC year information. The date at the end of the month is (surface-mount package with an integrated crystal) automatically adjusted for months with fewer than 31 days, 2 I C Serial interface (Normal and Fast modes) including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Two time-of-day alarms Oscillator Stop Flag Applications Programmable square-wave output defaults to 32 kHz on Telecommunication (Routers, Switches, Servers) power-up Handhelds (GPS, POS terminals, MP3 players) Operating voltage of 1.8 to 5.5 V Set-Top Box, Digital Recording, Industrial temperature range (-40 to +85C) 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 SQW/INTB X1 MUX/ 32.768 kHz Buffer INTA Oscillator and Divider X2 Clock, Control Calendar Logic Counter SCL 2 I C 1 Byte 7 Bytes Alarm Interface Control Buffer Registers SDA GND 2 IDT REAL-TIME CLOCK WITH I C SERIAL INTERFACE 1 IDT1337G REV M 073013IDT1337G 2 REAL-TIME CLOCK WITH I C SERIAL INTERFACE RTC Pin Assignment (8-pin MSOP/SOIC) Pin Assignment (16-pin VFQFPN) X1 8 1 VCC X2 2 7 SQW/INTB IDT1337G 13 INTA 3 6 SCL NC 1 NC GND 5 4 SDA INTA VCC GND SQW/INTB NC 9 NC 5 Pin Assignment (16-pin SOIC) 1 16 SCL SDA SQW/INTB 2 15 GND VCC 14 3 INTA 13 NC 4 NC IDT1337G 5 NC NC 12 6 NC NC 11 7 NC 10 NC 8 NC 9 NC 2 IDT REAL-TIME CLOCK WITH I C SERIAL INTERFACE 2 IDT1337G REV M 073013 NC NC SDA X2 SCL X1 NC NC