DS1306N

Real Time Clock Overview

The DS1306N is a serial alarm real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-pin DIP package. It provides binary-coded decimal (BCD) timekeeping for seconds, minutes, hours, date, month, and year, with leap-year compensation valid until 2100. The device includes 96 bytes of battery-backed NV RAM and two programmable time-of-day alarms. It operates on a single supply voltage ranging from 2.0V to 5.5V and supports both Motorola SPI modes 1 and 3, as well as a standard 3-wire interface. The industrial temperature range extends from -40°C to +85°C.

Real Time Clock Feature Summary

• Full BCD clock/calendar with automatic end-of-month adjustment and leap-year correction through 2100
• 96-byte battery-backed non-volatile RAM for data storage
• Dual programmable alarms with interrupt outputs (INT0/INT1)
• Supports SPI (Modes 1 & 3) and 3-wire serial interfaces via SERMODE pin
• Programmable trickle charger for backup power sources

Real Time Clock Applications

• Industrial systems requiring precise timekeeping in wide temperature ranges
• Data logging devices needing battery-backed memory retention
• Alarm-based monitoring equipment utilizing dual interrupt capabilities
• Embedded controllers interfacing via SPI or 3-wire protocols

Real Time Clock Procurement Notes

Verify the specific suffix 'N' confirms the industrial temperature grade (-40°C to +85°C). Confirm the package type matches the required 16-pin DIP form factor. Check for lead-free/RoHS compliance if indicated by a '+' suffix in ordering information. Ensure the primary supplier documentation aligns with the Analog Devices/Maxim Integrated part number DS1306N.

Real Time Clock Selection Notes

Select the DS1306N when an industrial temperature range is mandatory for the application environment. Choose this component over commercial variants if operation below 0°C is required. Ensure the system design accommodates the 16-pin DIP footprint. Verify that the microcontroller supports either SPI Mode 1/3 or 3-wire synchronous communication protocols compatible with the SERMODE pin configuration.

Real Time Clock Part Context

The DS1306N is the industrial-grade variant of the DS1306 series, distinguished by its extended temperature range of -40°C to +85°C compared to the commercial 0°C to +70°C versions. It shares the same functional architecture and pinout as other DS1306 models but is optimized for harsher operating conditions. The 'N' designation specifically identifies this temperature rating within the Maxim Integrated product line.

Real Time Clock Replacement Considerations

Direct substitutes include the DS1306+ (commercial grade) if temperature requirements allow. For industrial needs, verify availability of other DS1306 industrial variants like the DS1306EN in TSSOP packages if pin compatibility differs. Cross-reference with newer low-power RTCs from the manufacturer if power consumption is a critical constraint.