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DS1340U-18+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1340U-18+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page 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 Laboratory (UL) Recognized I2C RTC with Trickle Charger ______________________________________________ Maxim Integrated Products 1 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 Rev 4; 3/06 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 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) D1340-33 DS1340U-18 -40°C to +85°C 8 µSOP 1340A1-18 DS1340U-3 -40°C to +85°C 8 µSOP 1340A1-3 DS1340U-33 -40°C to +85°C 8 µSOP 1340A1-33 DS1340C-18 -40°C to +85°C 16 SO 1340C-18 DS1340C-3 -40°C to +85°C 16 SO 1340C-3 DS1340C-33 -40°C to +85°C 16 SO 1340C-33 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) D1340-33 DS1340U-18+ -40°C to +85°C 8 µSOP 1340A1-18 DS1340U-3+ -40°C to +85°C 8 µSOP 1340A1-3 DS1340U-33+ -40°C to +85°C 8 µSOP 1340A1-33 DS1340C-18# -40°C to +85°C 16 SO 1340C-18 DS1340C-3# -40°C to +85°C 16 SO 1340C-3 DS1340C-33# -40°C to +85°C 16 SO 1340C-33 *Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these com- ponents in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. Pin Configurations appear at end of data sheet. + Denotes a lead-free/RoHS-compliant device. # Denotes a RoHS-compliant device that may include lead 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-free device. A "#" denotes a RoHS-compliant device. |
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