DS1302N+

Overview

The DS1302N+ is a real-time clock and calendar IC manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, date, month, day of week, and year information with leap-year compensation valid up to the year 2100. The device features 31 bytes of battery-backed static RAM and communicates via a simple 3-wire serial interface (CE, I/O, SCLK). It operates on a supply voltage range of 2V to 5.5V with a maximum timekeeping current of 1µA at 5V. The component is housed in an 8-pin DIP package and supports an industrial operating temperature range of -40°C to +85°C.

Feature Summary

• Real-time clock/calendar with leap-year compensation valid through 2100
• 31-byte battery-backed NVSRAM for general-purpose data storage
• Simple 3-wire synchronous serial interface compatible with most microcontrollers
• Programmable trickle charger for backup power source maintenance

Applications

• Portable instruments requiring precise timekeeping
• Telecommunication equipment
• Faxes and computer peripherals
• Battery-powered embedded systems

Procurement Notes

Verify that the specific order corresponds to the 'DS1302N+' suffix, which indicates the industrial temperature grade (-40°C to +85°C) and 8-pin PDIP package. Confirm RoHS compliance status based on the '+' designation in the ordering information table. Ensure the application circuit accounts for the dual power pin configuration (VCC1 and VCC2) for primary and backup power management.

Selection Notes

Select the DS1302N+ when an industrial temperature range is required alongside a through-hole DIP package. Compare against the commercial grade DS1302+ if operation above 70°C is not needed. Consider the DS1302SN+ variant if surface-mount packaging is preferred while maintaining the industrial temperature rating. Ensure the host microcontroller supports the required 3-wire synchronous serial protocol.

Part Context

The DS1302 series serves as a successor to the DS1202, adding dual power pins and a programmable trickle charger. The 'N' suffix specifically denotes the industrial temperature extension (-40°C to +85°C) compared to the standard commercial grade. The '+' suffix indicates lead-free/RoHS-compliant manufacturing. This part is distinct from I2C-based RTCs like the DS1307 due to its proprietary 3-wire interface.

Replacement Considerations

Direct functional replacements within the same package and temperature grade include the DS1302Z+ (commercial SOIC) or DS1302SN+ (industrial SOIC), provided the PCB allows for package adaptation. Cross-family replacements such as the DS3231 offer higher accuracy but require I2C interface compatibility.