IDT 1337, 1338 & 1339 SERIAL Real-time clocks FLYER (R) IDT 1337, 1338 & 1339 I2C Serial Real-Time Clocks Low-power, flexible and reliable clock devices enable efficient and cost-effective designs General Description Applications * Handhelds (GPS, POS terminals, MP3 players) * Consumer Electronics (set-top box, digital recording) * Office (fax, printers, copiers) * Medical (glucometer, medicine dispensers) * Telecom (routers, switches, servers, network applications) * Other (thermostats, vending machines, modems, utility meters, digital photo frames, white goods) Integrated Device Technology Inc. introduces its first series of ultra low-power real-time clocks (RTC): IDT1337, IDT1338, and IDT1339. All three devices offer fast and standard I2C interface, time and date function, and are available in a variety of packages, making them cost-effective. These devices are suitable for applications that require minimum board space. By offering high noise immunity, low current consumption, 12/24 hour mode of operation, auto correction for leap year and programmable square wave output -- they are ideal for a wide range of design applications. IDT RTC devices operate over an extended supply voltage range of 1.8V to 5.5V, a temperature range of -40C to +85C, and consume less than 1 A current, thus enabling long battery life. The lowest time keeping voltage is 1.3V. The chart below provides an overview of additional features and benefits of the IDT1337, IDT1338 and IDT1339 real-time clocks. 1337 1338-18 1338-31 1339-2 1339-31 Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100 (auto correction for leap year) 4 4 4 12/24 hour mode of operation with AM/PM indicator 4 4 4 End of month date adjusted for months fewer than 31 days, including corrections for leap years 4 4 4 High noise immunity 4 4 4 Programmable square-wave output (on 1337, defaults to 32 kHz on power-up) 4 4 4 Full binary-coded decimal (BCD) clock/calendar 4 4 4 Two programmable time-of-day alarms 4 Oscillator Stop-Flag 4 4 4 Package Available in a variety of packages: 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal) 4 4 4 Enables long battery life Consumes less than 1 mA current 4 4 4 Low power, low current consumption clock/date device 4 4 4 VCC operating voltage range 1.8V to 5.5V 4 1338-18 1339-2 1338-31 1339-31 Time keeping voltage 1.3V minimum 4 4 4 Operating temperature Industrial temperature range (-40C to +85C) 4 4 4 Suitable for wide range of applications where minimal board space is essential I2C Serial bus interface 4 4 4 Integrated 32 kHz crystal 16 pin SOIC package only 4 4 4 Battery backup and data storage Automatic power-fail detect and switch circuitry (backup battery to the main VCC), maintaining time/date operation 4 4 56-byte battery-backed NV SRAM for data storage to main VCC 4 Benefits Features Ideal for wide range of design applications 2.7V to 5.5V Trickle charge capability IDT(R) 1337, 1338 & 1339 SERIAL Real-time clocks FLYER 4 4 (R) I C Serial Real-Time Clock IDT1337 IDT1338 IDT1339 2 X1 1 Hz/4.096 kHz/8.192 kHz/32.768 kHz CL Mux/ Buffer SQW/OUT 1 Hz X2 CL Oscillator and Divider 16-pin SOIC version only (included in the package) Vcc (1338 Only) Alarms Power Control GND VBAT RAM (56x8) Control Logic (1338 & 1339 only) SDA Trickle Charge (1339 Only) Clock, Calendar and Control Registers Serial Bus Interface and Address Register SCL (1337 and 1339) (1337, 1338, and 1339) User Buffer (7 bytes) PIN Assignment X1 1 X2 2 INTA GND PIN Assignment 8 VCC X1 1 7 SQW/INTB X2 2 3 6 SCL VBAT 4 5 SDA GND (R) IDT1337 (8-pin MSOP and SOIC) PIN Assignment 8 VCC X1 1 7 SQW/OUT X2 2 3 6 SCL VBACKUP 4 5 SDA GND (R) IDT1338 (8-pin MSOP and SOIC) PIN Assignment SDA SCL 1 15 GND SQW/OUT 2 3 14 INTA VCC NC 4 13 NC NC 5 12 NC 6 NC NC VCC 7 SQW/INT 3 6 SCL 4 5 SDA (8-pin MSOP and SOIC) PIN Assignment 16 8 PIN Assignment 16 SDA SCL 1 15 GND SQW/INT 2 3 14 VBAT VCC NC 4 13 NC NC NC 5 12 11 NC NC 6 7 10 NC NC 8 9 NC NC SCL 1 SQW/INTB 2 VCC (R) IDT1337 (16-pin SOIC, 300 mil) (R) IDT1339 16 SDA 15 GND 3 14 VBACKUP NC 4 13 NC NC NC 5 12 NC 11 NC NC 6 11 NC 7 10 NC NC 7 10 NC 8 9 NC NC 8 9 NC (R) IDT1338 (16-pin SOIC, 300 mil) (R) IDT1339 (16-pin SOIC, 300 mil) Discover what IDT know-how can do for you. www.IDT.com/go/RTC www.IDT.com/go/timing (c) 2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. (R) Printed in USA 5-08/MG/KIP/HOP/1K FLYR-RTC-058