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DS1340Z-3 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1340Z-3 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page I2C RTC with Trickle Charger DS1340 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. General Description The DS1340 is a real-time clock (RTC)/calendar that is pin compatible and functionally equivalent to the ST M41T00, including the software clock calibration. The device additionally provides trickle-charge capability on the VBACKUP pin, a lower timekeeping voltage, and an oscillator STOP flag. Block access of the register map is identical to the ST device. Two additional regis- ters, which are accessed individually, are required for the trickle charger and flag. The clock/calendar pro- vides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the back- up supply. Reads and writes are inhibited while the clock continues to run. The device is programmed seri- ally through an I2C bidirectional bus. Applications Portable Instruments Point-of-Sale Equipment Medical Equipment Telecommunications Features ♦ Enhanced Second Source for the ST M41T00 ♦ Available in a Surface-Mount Package with an Integrated Crystal (DS1340C) ♦ Fast (400kHz) I2C Interface ♦ Software Clock Calibration ♦ RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year ♦ Automatic Power-Fail Detect and Switch Circuitry ♦ Trickle-Charge Capability ♦ Low Timekeeping Voltage Down to 1.3V ♦ Three Operating Voltage Ranges (1.8V, 3V, and 3.3V) ♦ Oscillator Stop Flag ♦ Available in 8-Pin µSOP or SO Packages ♦ Underwriters Laboratories (UL) Recognized Ordering Information 4 CPU VCC VCC VCC 5 6 8 12 SDA SCL GND X2 X1 VCC C1 RPU RPU CRYSTAL FT/OUT VBACKUP 3 7 RPU = tR / CB DS1340 Typical Operating Circuit PART TEMP RANGE PIN- PACKAGE TOP MARK† DS1340Z-18+ -40°C to +85°C 8 SO (0.150in) D1340-18 DS1340Z-3+ -40°C to +85°C 8 SO (0.150in) DS1340-3 DS1340Z-33+ -40°C to +85°C 8 SO (0.150in) D134033 DS1340U-18+ -40°C to +85°C 8 μSOP 1340 -18 DS1340U-3+ -40°C to +85°C 8 μSOP 1340 -3 DS1340U-33+ -40°C to +85°C 8 μSOP 1340 -33 DS1340C-18# -40°C to +85°C 16 SO DS1340C-18 DS1340C-3# -40°C to +85°C 16 SO DS1340C-3 DS1340C-33# -40°C to +85°C 16 SO DS1340C-33 Pin Configurations appear at end of data sheet. + Denotes a lead(Pb)-free/RoHS-compliant package. # Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under RoHS requirements. The lead finish is JESD97 category e3, and is compatible with both lead-based and lead-free soldering processes. †A "+" anywhere on the top mark denotes a lead(Pb)-free device. A "#" denotes a RoHS-compliant device. 19-5578; Rev 8; 4/13 |
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