DS1302S-16

Overview

The DS1302S-16 is a Real-Time Clock (RTC) integrated circuit 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 simple 3-wire serial interface compatible with most microcontrollers and includes 31 bytes of battery-backed static RAM. Operating on a supply voltage of 2V to 5.5V, it consumes less than 300nA at 2.0V. Key features include a programmable trickle charger for backup power sources and support for both 12-hour and 24-hour time formats.

Feature Summary

• Real-time clock/calendar with leap-year compensation valid up to 2100
• 31-byte battery-backed general-purpose static RAM
• Simple 3-wire synchronous serial interface (CE, I/O, SCLK)
• Programmable trickle charger for VCC1 backup source

Applications

• Embedded systems requiring precise timekeeping
• Portable instruments with battery backup needs
• Industrial control panels with low-power constraints
• Data logging devices maintaining timestamps during power loss

Procurement Notes

Verify the specific suffix 'S-16' against official manufacturer documentation, as standard datasheets primarily list 8-pin packages (DIP/SO). Confirm lead-free status via the '+' designation if required. Check component availability status, as older RTC models may be discontinued or subject to long-lead times. Ensure the 16-SOIC package dimensions match the target PCB footprint.

Selection Notes

Select this component when a low-cost, low-power RTC with a simple 3-wire interface is required. It is suitable for microcontrollers lacking dedicated hardware SPI/I2C peripherals. Consider the 16-SOIC package only if the specific board layout requires this form factor; otherwise, standard 8-pin variants are more commonly referenced. Ensure the application supports the commercial temperature range of 0°C to 70°C.

Part Context

The DS1302 series is a successor to the DS1202, offering enhanced features such as dual power pins and a trickle charger. While the standard datasheet focuses on 8-pin packages, the DS1302S-16 represents a surface-mount variant. It is widely used in applications where space is limited but precise timekeeping and data retention during power outages are critical.

Replacement Considerations

Direct pin-compatible replacements in different packages include DS1302N+ (8-PDIP), DS1302S+ (8-SO), and DS1302Z+ (8-SO). For industrial temperature ranges (-40°C to +85°C), consider DS1302SN+ or DS1302ZN+. Verify that any substitute maintains the 3-wire serial interface and 31-byte RAM capacity.