DS1338Z-3+T&R

Real Time Clock Overview

The DS1338Z-3+T&R is a low-power serial real-time clock (RTC) and 56-byte NV SRAM in an 8-SOIC package. It operates on a supply voltage of 2.7V to 5.5V with standby current up to 125µA at 3.3V. The device features an I²C interface, automatic power-fail detection, and leap-year compensation valid until 2100. It supports 12/24-hour formats and provides a programmable square-wave output.

Real Time Clock Feature Summary

• I²C Serial Interface for time/calendar and RAM access
• Automatic Power-Fail Detect and Switch Circuitry
• Leap-Year Compensation Valid Up to 2100
• Programmable Square-Wave Output Signal

Real Time Clock Applications

• Handhelds (GPS, POS Terminal)
• Consumer Electronics (Set-Top Box, Digital Recording)
• Office Equipment (Fax/Printer, Copier)
• Medical (Glucometer, Medicine Dispenser)
• Telecommunications (Router, Switcher, Server)

Real Time Clock Procurement Notes

Verify the 'Z' suffix indicates the 8-SOIC (0.150") package and the '-3+' suffix specifies the 2.7V–5.5V operating range. Confirm RoHS compliance status via manufacturer documentation. Ensure ordering quantities match standard reel specifications provided by distributors.

Real Time Clock Selection Notes

Select this part when an 8-pin surface-mount RTC with integrated NV SRAM is required. The -3+ variant supports a wide supply voltage range starting from 2.7V. Verify that the system design accommodates the external 32.768kHz crystal connected to X1/X2 pins for oscillator operation.

Real Time Clock Part Context

This component belongs to the DS1338 family of serial RTCs manufactured by Analog Devices/Maxim Integrated. The 'Z' designation distinguishes the 8-SOIC package from the 'U' (µSOP) or 'C' (integrated crystal) variants within the same functional series.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements include other DS1338 variants such as DS1338Z-18+T&R or DS1338Z-33+T&R, provided their specific voltage ranges align with the application requirements.