DS1302SN-16

Overview

The DS1302SN-16 is a Real-Time Clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC package. It manages timekeeping functions including seconds, minutes, hours, date, month, day of the week, and year with leap-year compensation valid up to 2100. The device features a 31-byte battery-backed static RAM and communicates via a simple 3-wire serial interface. Operating on a supply voltage of 2V to 5.5V, it supports both 12-hour and 24-hour formats. The industrial temperature grade (-40°C to +85°C) ensures reliability in demanding environments.

Feature Summary

• Real-time clock/calendar with leap-year compensation valid up to 2100
• 31 bytes of battery-backed general-purpose static RAM
• Simple 3-wire synchronous serial interface compatible with most microcontrollers
• Low power operation: less than 300nA at 2.0V

Applications

• Data logging systems requiring precise timestamping
• Industrial control panels needing reliable timekeeping
• Battery-powered consumer electronics
• Smart meters and utility devices

Procurement Notes

Verify the specific package variant during procurement. Official documentation indicates the standard DS1302 series utilizes an 8-pin SOIC package. Confirm that the '16' suffix in the model number corresponds to the intended 16-SOIC form factor or represents a specific distributor designation, as datasheet ordering information lists only 8-pin configurations.

Selection Notes

Select this component for applications requiring low-power RTC functionality with minimal GPIO usage. Ensure the design accommodates the 3-wire serial protocol constraints. Verify that the operating environment falls within the -40°C to +85°C range. Consider the need for an external 32.768kHz crystal if not provided on the module.

Part Context

The DS1302 is a successor to the DS1202, offering dual power pins for primary and backup supplies and a programmable trickle charger. While the standard datasheet specifies 8-pin packages (DIP and SO), the DS1302SN-16 denotes a surface-mount variant. Users should cross-reference the pinout carefully if the package count differs from the standard 8-pin layout.

Replacement Considerations

The DS1302S-16 is a commercial grade (0°C to +70°C) alternative with similar specifications but a narrower temperature range. For direct functional replacement in industrial settings, ensure the substitute maintains the -40°C to +85°C rating.