DS1286 Real-Time Clock IC 28-DIP with Embedded Lithium Battery, 50B RAM, ±1 Minute/Month Accuracy
The DS1286 is a comprehensive watchdog timekeeper IC featuring an integrated real-time clock, alarm functions, watchdog timer, and interval timer in a 28-pin JEDEC DIP package. This self-contained solution includes an embedded lithium energy source and quartz crystal, eliminating the need for external components.
- Maintains time tracking for hundredths of seconds, seconds, minutes, hours, days, months, and years
- Automatic leap year compensation valid through 2100
- Watchdog timer automatically restarts malfunctioning processors
- Programmable alarm function for scheduling time-based activities
- Embedded lithium energy cell provides over 10 years of backup timekeeping
- Accuracy better than ±1 minute/month at +25°C
- 50 bytes of user non-volatile RAM
- Programmable interrupts and square wave outputs
- UL Recognized and industrial temperature range option (-40°C to +85°C)
| Attribute | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Product Category | IC Chips |
| Type | Clock/Calendar |
| Package | 28-DIP Module (0.61", 15.49mm) |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Through Hole |
| Voltage Supply | 4.5 V ~ 5.5 V |
| Battery Voltage | 2.4 V ~ 3.5 V |
| Current Timekeeping (Max) | 7mA @ 5V |
| Memory Capacity | 50B |
| Time Format | HH:MM:SS:hh (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Interface | Parallel |
The DS1286 operates as a complete timekeeping solution with 64 individually addressable 8-bit registers accessible via parallel interface. The intelligent control circuitry automatically detects VCC status and write-protects memory when voltage falls below tolerance levels. All registers can be read or written similarly to byte-wide static RAM.
When VCC exceeds 4.5V, the device operates normally. If VCC decays below approximately 3.0V, the internal lithium energy source automatically engages to maintain clock, timer, and data functionality for over 10 years without external power.
Ideal for embedded systems, industrial controllers, data loggers, and any application requiring reliable real-time clock functionality with watchdog protection and extended battery backup capabilities.
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