ISL1221IUZ-T

Real Time Clock Overview

The ISL1221IUZ-T is a Real-Time Clock (RTC) IC functioning as a time event recorder, manufactured by Renesas Electronics Corporation. It features an I2C 2-wire serial interface and operates within a supply voltage range of 2.7V to 5.5V, with battery backup support from 1.8V to 5.5V. The device consumes 4µA to 6µA at 3V to 5V. It provides 2 bytes of SRAM storage and supports HH:MM:SS time formats in both 12-hour and 24-hour modes, alongside YY-MM-DD-dd date formatting. Housed in a 10-MSOP package, it operates between -40°C and +85°C.

Real Time Clock Feature Summary

• Integrated time event recording capability with alarm functions
• I2C 2-wire serial interface for communication
• Low power consumption: 4µA ~ 6µA @ 3V ~ 5V
• Includes 2B SRAM and leap year compensation

Real Time Clock Applications

• Industrial controls requiring precise time stamping
• Systems needing event logging via RTC SRAM
• Battery-backed real-time clock applications

Real Time Clock Procurement Notes

The ISL1221IUZ-T is officially listed as End-of-Life (EOL) with discontinuance effective April 1, 2022. Verification of availability should focus on surplus or obsolete stock channels, as standard production has ceased. RoHS3 compliance is confirmed. Designers must assess long-term supply risks given the EOL status.

Real Time Clock Selection Notes

Select this component only if legacy compatibility with the ISL1221 family is required. Verify that the 10-MSOP package fits the PCB footprint. Ensure the application can accommodate the EOL status and potential lack of future manufacturing support. Compare against newer Renesas RTCs if new designs are permissible.

Real Time Clock Part Context

This part belongs to the ISL1221 series of real-time clocks. It shares the base model number ISL1221 but includes specific suffixes indicating the MSOP package and tape-and-reel packaging. It is distinct from similar parts like the ISL1219, which lacks the event recorder feature set.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation due to the End-of-Life status. Engineers should consult Renesas for current portfolio alternatives or evaluate pin-compatible successors if applicable.