DS1302Z+T&R

Overview

The DS1302Z+T&R is a trickle-charge real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping functions including seconds, minutes, hours, date, month, and year with leap-year compensation valid up to the year 2100. The device features 31 bytes of battery-backed static RAM for general-purpose data storage. Communication is handled via a simple 3-wire serial interface compatible with TTL logic levels at 5V. Operating within a supply voltage range of 2V to 5.5V, it consumes less than 300nA at 2.0V. The component is housed in an 8-SOIC package with a width of 3.90mm and supports commercial operating temperatures from 0°C to +70°C.

Feature Summary

• Real-time clock/calendar with leap-year compensation valid through 2100
• 31-byte battery-backed static RAM for non-volatile data storage
• Simple 3-wire serial interface (CE, I/O, SCLK) compatible with most microcontrollers
• Programmable trickle charger for backup power source maintenance

Applications

• Portable instruments requiring precise timekeeping
• Telecommunication equipment needing calendar tracking
• Battery-operated systems utilizing trickle charging for backup power

Procurement Notes

Verify that the specific order matches the commercial temperature grade (0°C to +70°C). Ensure the 8-SOIC (150 mils) package dimensions align with the PCB footprint requirements. Confirm RoHS compliance status if required by local regulations, as indicated by the '+' suffix in the part number.

Selection Notes

Select this component when a low-pin-count serial interface is preferred over I2C or SPI protocols. It is suitable for applications requiring dual power supply management between primary and backup sources. Consider the industrial temperature variant (-40°C to +85°C) if operation outside the commercial range is necessary.

Part Context

This part belongs to the DS1302 family of trickle-charge timekeeping chips. The 'Z' suffix denotes the 8-SOIC (150 mils) surface-mount package, while '+T&R' indicates lead-free/RoHS-compliant packaging in Tape & Reel format. It serves as a successor to earlier models like the DS1202, offering enhanced memory and simplified interfacing.

Replacement Considerations

For industrial temperature requirements (-40°C to +85°C), consider the DS1302ZN+T&R. For DIP packaging alternatives, the DS1302+ or DS1302N+ may be used. Verify pin compatibility and software register mappings before substituting.