DS1302Z+

Overview

The DS1302Z+ 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, day of the week, and year with leap-year compensation valid through 2100. The device includes 31 bytes of battery-backed static RAM for general-purpose data storage. Communication with a microprocessor occurs via a simple synchronous 3-wire serial interface (CE, I/O, SCLK). It operates on a supply voltage range of 2V to 5.5V and consumes less than 300nA at 2.0V. The component is housed in an 8-pin SOIC package with a commercial operating temperature range of 0°C to +70°C.

Feature Summary

• Real-time clock/calendar with automatic end-of-month adjustment and leap-year correction up to 2100
• 31-byte battery-backed static RAM for non-volatile data storage
• Simple 3-wire synchronous serial interface compatible with most microcontrollers
• Programmable trickle charger for backup battery or super capacitor maintenance

Applications

• Clock and timing systems requiring low power consumption
• Portable instruments and handheld devices
• Telecommunication equipment
• Fax machines and office automation devices

Procurement Notes

Verify that the specific order suffix matches the required package type and temperature grade. The 'Z' suffix indicates an 8-pin SOIC (150 mils) package. Ensure the '+ 'suffix confirms lead-free/RoHS compliance if required by manufacturing standards. Confirm availability status as distribution channels may vary for this specific part number.

Selection Notes

Select the DS1302Z+ when a surface-mount RTC with a narrow SOIC footprint is required. This variant supports the commercial temperature range (0°C to +70°C). For industrial temperature applications (-40°C to +85°C), consider the DS1302ZN+ variant instead. Ensure the design accommodates the 3-wire serial interface requirements and provides a 32.768kHz crystal with a 6pF load capacitance.

Part Context

The DS1302 series serves as a successor to the DS1202, offering enhanced features such as dual power pins for primary and backup supplies and a programmable trickle charger. The Z suffix specifically denotes the 8-pin Small Outline (SO) package with a 150-mil width, distinguishing it from the wider 208-mil SO (S suffix) or DIP (DIP suffix) packages within the same family.

Replacement Considerations

For industrial temperature grades, the DS1302ZN+ offers identical functionality in the same package but supports -40°C to +85°C operation. Other variants include DS1302N+ (Industrial DIP) and DS1302SN+ (Industrial SO 208 mils). Verify pin compatibility and software register definitions remain consistent across these derivatives.