DS1388Z-3

Real Time Clock Overview

The DS1388Z-3 is an I2C real-time clock (RTC), supervisor, and EEPROM device from the DS1388 family. It integrates a clock/calendar, programmable watchdog timer, power supply monitor with reset, and 512 bytes of EEPROM. The RTC counts hundredths of seconds, seconds, minutes, hours, day, date, month, and year, supporting 24-hour or 12-hour formats with AM/PM indication and leap year compensation valid until 2100. Operating at a nominal 3.3V supply, it features a fast 400kHz I2C interface, automatic power-fail detect and switch circuitry, and integrated trickle-charge capability for backup supplies. The device operates within a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated I2C RTC with 512-byte EEPROM and supervisor functions
• Fast 400kHz I2C interface with programmable watchdog timer
• Automatic power-fail detection and switching with reset output
• Trickle-charge capability for external backup supply

Real Time Clock Applications

• Systems requiring precise timekeeping with non-volatile data storage
• Industrial control systems needing power-fail monitoring
• Embedded devices utilizing I2C communication protocols

Real Time Clock Procurement Notes

Verify the specific voltage suffix (e.g., Z-3 for 3.3V) against system requirements. Confirm package availability and lead times through authorized distributors. Ensure RoHS compliance documentation is obtained for regulatory adherence. Check for obsolescence status as older Maxim Integrated parts may have limited production runs.

Real Time Clock Selection Notes

Select the DS1388Z-3 variant specifically for 3.3V logic interfaces. Compare with DS1388Z-5+ for 5V systems or DS1388Z-33+ for 3.0V applications. Consider the 512-byte EEPROM capacity versus smaller alternatives like the DS1338 if memory requirements are lower. Verify I2C bus compatibility and pull-up resistor requirements for the target application speed.

Real Time Clock Part Context

The DS1388 series combines RTC, supervisor, and EEPROM functionalities in a single package. The 'Z' indicates RoHS-compliant packaging. The numeric suffix denotes the operating voltage: '3' corresponds to 3.3V operation. This part belongs to the broader Maxim Integrated (now Analog Devices) portfolio of multifunction timing and monitoring solutions.