The DS1306 is a real-time clock (RTC) manufactured by Maxim. It has 1Hz and 32.768kHz clock outputs, supports Motorola SPI™ (Serial Peripheral Interface) Modes 1 and 3 or Standard 3-Wire Interface, supports reading/writing successive addresses in Clock/RAM, has dual power supply pins, optional trickle charge output to backup supply, operating voltage range of 2.0V to 5.5V, optional industrial temperature range of -40°C to +85°C, and is packaged in an efficient 20-pin TSSOP package and is Underwriters Laboratory (UL) recognized.
The Maxim DS1306 is a serial‑alarm real‑time clock (RTC) that provides seconds, minutes, hours, date, month, day‑of‑week and year with leap‑year compensation up to 2100. It includes 96 bytes of battery‑backed non‑volatile RAM and two programmable time‑of‑day alarms with interrupt outputs.
The device supports Motorola SPI modes 1 and 3 or a standard 3‑wire interface, offers 1 Hz and 32.768 kHz clock outputs, dual‑power‑supply pins for primary and backup power, and an optional trickle‑charge circuit. Electrical characteristics, timing diagrams and package information are provided for both 20‑pin TSSOP and 16‑pin DIP versions.
| Operating voltage | 2.0 V to 5.5 V |
|---|---|
| Industrial temperature range | -40 °C to +85 °C |
| Non‑volatile RAM | 96 bytes |
| Clock outputs | 1 Hz and 32.768 kHz |
| Number of alarms | Two time‑of‑day alarms |
| Interface modes | Motorola SPI modes 1 & 3 or standard 3‑wire |
| Package options | 20‑pin TSSOP, 16‑pin DIP |
The DS1306 operates from –40 °C to +85 °C in industrial temperature range.
It provides two time‑of‑day alarms that can generate interrupt signals.
The device includes 96 bytes of battery‑backed non‑volatile RAM.