ISL12021CVZ

Real Time Clock Overview

The ISL12021CVZ is a Real-Time Clock (RTC) IC manufactured by Renesas Electronics Corporation, formerly Intersil. It integrates a clock/calendar function with 128 bytes of SRAM for data storage. The device communicates via an I2C, 2-wire serial interface and operates within a supply voltage range of 2.7V to 5.5V. Battery backup support allows operation from 1.8V to 5.5V. Current consumption is specified at 5.5µA to 6.5µA at 3V to 5V. It is housed in a 14-TSSOP package (0.173", 4.40mm wide) and supports surface mount installation.

Real Time Clock Feature Summary

• Integrated 128-byte SRAM for user data storage alongside clock/calendar functions
• I2C, 2-wire serial interface for system communication
• Supports alarm, daylight saving time, leap year, and interrupt features
• Operates on main supply 2.7V–5.5V and battery backup 1.8V–5.5V

Real Time Clock Applications

• Systems requiring precise timekeeping with non-volatile data storage
• Industrial equipment needing calendar and alarm functionality
• Portable electronics utilizing low-power RTC solutions

Real Time Clock Procurement Notes

The ISL12021CVZ is listed as End-of-Life (EOL) or obsolete by the manufacturer. Verification of current availability requires checking authorized distributors for remaining stock or surplus channels. Standard packaging quantity is 96 units per tube. Compliance includes RoHS3 and REACH status confirmation prior to procurement.

Real Time Clock Selection Notes

Select this component when 128 bytes of integrated SRAM are required alongside RTC functions. Ensure the application supports I2C communication and fits within the 2.7V–5.5V operating voltage range. The 14-TSSOP package must be accommodated in the PCB layout. Verify that the -20°C to 70°C commercial temperature range meets environmental requirements.

Real Time Clock Part Context

This part belongs to the ISL12021 family of real-time clocks. It shares the core RTC architecture with variants like the ISL12028, which offers larger memory capacity (512B) and extended industrial temperature ranges (-40°C to +85°C). The CVZ suffix denotes the specific commercial temperature grade and TSSOP package configuration.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements may include other ISL1202x series devices such as the ISL12028IVZ, though memory size and temperature ranges differ. Verify interface compatibility and register mapping before substitution.