Key facts
- Brand
- Maxim
- Model
- DS1284
- Documents
- 2
- Languages
- EN
- Last added
- 2012-04-11
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Maxim DS1284/DS1286 Watchdog Timekeeper Datasheet
The DS1284 and DS1286 are self‑contained watchdog timekeepers that combine a real‑time clock, alarm, watchdog timer, and interval timer in a 28‑pin JEDEC package. The DS1286 includes an embedded lithium energy cell, while the DS1284 requires an external crystal and battery. Both devices maintain time and data for over ten years without power and support 24‑hour or 12‑hour formats with AM/PM indication.
Key features include 64 individually addressable 8‑bit registers, 50 bytes of user non‑volatile RAM, programmable interrupts, square‑wave outputs, and operation over an industrial temperature range of –40 °C to +85 °C. Pin descriptions, timing diagrams, and command register functions are provided for system integration.
Maxim DS1284 specifications
| Number of registers | 64 8‑bit registers |
|---|---|
| User non‑volatile RAM | 50 bytes |
| Operating temperature range | –40 °C to +85 °C |
| Accuracy | Better than +1 minute/month at +25 °C |
| Battery‑backed timekeeping | Over 10 years without power |
All Maxim DS1284 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How many bytes of user RAM are available?
The device provides 50 bytes of user non‑volatile RAM.
What is the operating temperature range of the DS1284/DS1286?
The devices operate from –40 °C to +85 °C.
What is the voltage range for the VCC supply?
The VCC supply voltage can range from 4.5 V to 5.5 V, with a typical value of 5.0 V.
How many bytes of user non‑volatile RAM are available?
The device provides 50 bytes of user non‑volatile RAM.