DS1302SN-16/TR

Overview

The DS1302SN-16/TR is a trickle-charge real-time clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated. It provides seconds, minutes, hours, date, day of the week, and month information, including leap-year compensation. The device features 31 bytes of static RAM for data storage and communicates via a simple 3-wire serial interface. It operates within a supply voltage range of 2V to 5.5V and consumes a maximum timekeeping current of 0.3µA to 1µA across this range. Designed for surface-mount applications, it is housed in an 8-SOIC package with a width of 5.30mm and supports an operating temperature range of -40°C to 85°C.

Feature Summary

• Integrated 31-byte NVSRAM for non-volatile data storage
• Simple 3-wire serial interface reduces microcontroller pin usage
• Automatic leap-year compensation up to year 2100
• Trickle charger capability for battery backup maintenance

Applications

• Portable instruments requiring precise timekeeping
• Telecommunication equipment
• Fax machines and office automation devices
• Embedded systems with limited I/O resources

Procurement Notes

Verify the specific suffix 'TR' against official manufacturer documentation to confirm tape-and-reel packaging status, as local source fields indicate 'Bulk'. Ensure compatibility with existing PCB footprints for the 8-SOIC package. Confirm that the 3-wire serial protocol implementation aligns with the target microcontroller's software drivers or hardware capabilities.

Selection Notes

Select this component when a low-pin-count RTC solution is required for cost-sensitive embedded designs. The 3-wire interface is suitable for microcontrollers lacking dedicated SPI or I2C peripherals. Consider the 2V–5.5V supply range for flexibility in system power architectures. Verify that the 31-byte RAM capacity meets application data logging requirements.

Part Context

The DS1302 series was originally developed by Dallas Semiconductor before its acquisition by Maxim Integrated, now part of Analog Devices. The SN variant denotes the SOIC surface-mount package. This component serves as a widely adopted standard for basic timekeeping functions in legacy and modern embedded systems due to its simplicity and low power consumption.

Replacement Considerations

Direct pin-compatible replacements include other DS1302 variants such as DS1302Z+ or DS1302N+. For upgraded performance, consider Maxim Integrated/Analog Devices RTCs with I2C interfaces like the DS1307 or DS3231, noting that software adaptation will be required due to different communication protocols.