Product Summary

The D134033 is a real-time clock (RTC)/calendar that is pin compatible and functionally equivalent to the ST M41T00, including the software clock calibration. The D134033 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 registers, which are accessed individually, are required for the trickle charger and flag. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the backup supply. Reads and writes are inhibited while the clock continues to run.

Parametrics

D134033 absolute maximum ratings: (1)Voltage Range on VCC Pin Relative to Ground: -0.3V to +6.0V; (2)Voltage Range on SDA, SCL, and FT/OUT Relative to Ground: -0.3V to (VCC + 0.3V); (3)Operating Temperature Range: -40 to +85℃; (4)Storage Temperature Range: -55 to +125℃; (5)Soldering Temperature Range: See IPC/JEDEC.

Features

D134033 features: (1)Enhanced Second Source for the ST M41T00; (2)Available in a Surface-Mount Package with an Integrated Crystal (DS1340C); (3)Fast (400kHz) I2C Interface; (4)Software Clock Calibration; (5)RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year; (6)Automatic Power-Fail Detect and Switch Circuitry; (7)Trickle-Charge Capability; (8)Low Timekeeping Voltage Down to 1.3V; (9)Three Operating Voltage Ranges (1.8V, 3V, and 3.3V); (10)Oscillator Stop Flag; (11)Available in 8-Pin μSOP or SO Packages; (12)Underwriters Laboratory (UL) Recognized.

Diagrams

D134033 typical operating application