The DS1340 is an I2C real-time clock (RTC) with a trickle charger, which is pin compatible and functionally equivalent to the ST M41T00. It also provides a lower timekeeping voltage and an oscillator STOP flag.
The DS1340 provides seconds, minutes, hours, day, date, month and year information over an I2C bus. It includes a backup supply pin, power‑fail detection, and an oscillator‑stop flag for reliable timekeeping.
The device is offered in 8‑pin SOP/SO packages, with optional integrated crystal versions, and operates from 1.8 V to 5.5 V across a –40 °C to +85 °C temperature range. Detailed electrical characteristics, pin descriptions, and timing diagrams are included for hardware designers.
| Operating Temperature Range | -40 °C to +85 °C |
|---|---|
| I2C Clock Frequency (Fast mode) | 100 kHz – 400 kHz |
| Trickle‑Charge Capability | Enabled on VBACKUP pin |
| Oscillator Stop Flag (OSF) | Supported |
| Package Options | 8‑Pin SOP or SO, integrated‑crystal versions |
It is rated for –40 °C to +85 °C.
The device is available in an 8‑pin SOP or SO package.
Standard mode up to 100 kHz and fast mode up to 400 kHz are supported.