ISL12027IB27AZ-T

Real Time Clock Overview

The ISL12027IB27AZ-T is a Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics under the Intersil brand. It features an I2C bus interface for communication and provides timekeeping in HH:MM:SS (24-hour) format along with date tracking in YY-MM-DD-dd format. The device includes 512 bytes of EEPROM storage. It operates within a supply voltage range of 2.7 V to 5.5 V and supports backup switching for continuous operation during power loss. The component is housed in an SOIC-8 surface-mount package and functions reliably across an industrial temperature range from -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated Real-Time Clock/Calendar with 512-byte EEPROM
• I2C serial interface for system connectivity
• Backup switching capability for uninterrupted timekeeping
• SOIC-8 surface-mount package

Real Time Clock Applications

• Industrial systems requiring precise time synchronization
• Data logging equipment needing non-volatile storage
• Consumer electronics with calendar functionality

Real Time Clock Procurement Notes

The ISL12027IB27AZ-T is listed as End-of-Life (EOL) or obsolete by the manufacturer. Distribution availability is restricted, with some sources indicating limited stock or discontinuation notices. Verification of current lifecycle status and alternative sourcing channels is required before procurement planning.

Real Time Clock Selection Notes

Select this component only if legacy compatibility with the Intersil ISL12027 family is necessary. Ensure the design accommodates the SOIC-8 footprint and I2C interface constraints. Verify that the 512-byte EEPROM capacity meets data storage requirements and that the 2.7V–5.5V operating voltage aligns with the system power rails.

Real Time Clock Part Context

This part belongs to the ISL12027 series of RTCs, which also includes variants like the ISL12027IV27AZ in TSSOP-8 packaging. The 'B' suffix typically denotes the SOIC-8 package option, while 'T' indicates tape-and-reel packaging. The series integrates clock, calendar, and memory functions into a single low-power chip.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the EOL status, engineers should consult Renesas official cross-reference tools or evaluate newer RTC families with compatible pinouts and interfaces.