ISL1221IUZ

Real Time Clock Overview

The ISL1221IUZ is a Real-Time Clock (RTC) IC functioning as a time event recorder, manufactured by Renesas Electronics Corporation. It features an I2C and 2-wire serial interface for communication. The device operates within a supply voltage range of 2.7V to 5.5V and supports battery backup voltages from 1.8V to 5.5V. Current consumption during timing is specified between 4µA and 6µA at 3V to 5V. It includes 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. The component is housed in a 10-MSOP package with a width of 3.00mm.

Real Time Clock Feature Summary

• Integrated time event recording capability with alarm functions
• I2C and 2-wire serial bus interface compatibility
• Low power consumption of 4µA to 6µA @ 3V ~ 5V
• Built-in 2-byte SRAM for data storage

Real Time Clock Applications

• Industrial controls requiring precise time stamping
• Data logging systems needing event recording
• Embedded devices with I2C connectivity

Real Time Clock Procurement Notes

The ISL1221IUZ is officially listed as End-of-Life (EOL) with a discontinuation date of April 1, 2022. Availability is limited to existing stock; once inventory is depleted, the manufacturer will not replenish supplies. Verification of RoHS3 compliance and MSL level 2 status is recommended for current production integration.

Real Time Clock Selection Notes

Select this component only if legacy support for the ISL1221 series is required or if specific time event recording features are necessary. Ensure the design accommodates the 10-MSOP footprint. Given the EOL status, alternative solutions should be evaluated for long-term manufacturing sustainability.

Real Time Clock Part Context

This part belongs to the ISL1221 family of real-time clocks. It shares functional similarities with the ISL1219 but is specifically categorized as a time event recorder. Both devices utilize similar interfaces and packages but differ in specific feature sets regarding event logging capabilities.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the End-of-Life status, direct replacements must be identified through official Renesas obsolescence management channels or by evaluating functionally equivalent RTCs with event recording features.