ISL1208IU8Z-T7A

Real Time Clock Overview

The ISL1208IU8Z-T7A is a low-power real-time clock (RTC) IC manufactured by Renesas Electronics Corporation. It features an I2C interface with a maximum data transfer rate of 400kHz and operates within a supply voltage range of 2.7V to 5.5V. The device tracks time in hours, minutes, and seconds and includes calendar registers accurate through 2099 with automatic leap year correction. It incorporates 2 bytes of battery-backed user SRAM and supports single alarm functionality. The component is housed in an 8-MSOP package and maintains timing current between 4µA and 6µA at 3V to 5V.

Real Time Clock Feature Summary

• I2C Interface: Supports 400kHz data transfer rate for efficient communication.
• Calendar Accuracy: Tracks date, month, year, and day of the week with automatic leap year correction through 2099.
• Battery Backup: Includes 2 bytes of battery-backed SRAM and intelligent backup switching to maintain data during power failures.
• Low Power Consumption: Timing current ranges from 4µA to 6µA at 3V to 5V, with a battery supply current of 400nA.

Real Time Clock Applications

• Smart Home Appliances
• Industrial Control Systems
• Portable Electronic Devices

Real Time Clock Procurement Notes

Verify the specific package variant, as the ISL1208 series includes MSOP, SOIC, and TDFN options. Confirm that the required pinout matches the ST M41Txx or Maxim DS13xx compatibility if replacing legacy components. Ensure the design accounts for the external 32.768kHz crystal oscillator required for operation.

Real Time Clock Selection Notes

Select this component when a low-cost, low-power RTC with I2C interface is required. It is suitable for applications needing basic calendar functions and small form factor storage. Consider alternative packages like ISL1208IB8Z-T7A (SOIC) or ISL1208IRT8Z (TDFN) if different mounting styles are preferred, noting that some variants may be discontinued.

Real Time Clock Part Context

The ISL1208IU8Z-T7A belongs to the ISL1208 family of real-time clocks. This family is designed to be pin-compatible with popular legacy RTCs such as the ST M41Txx and Maxim DS13xx series, facilitating easier upgrades in existing designs. The 'U8' suffix indicates the 8-MSOP package type.

Real Time Clock Replacement Considerations

The ISL1208IB8Z-T7A (SOIC package) and ISL1208IRT8Z (TDFN package) are part-number alternatives within the same functional family. Note that the ISL1208IRT8Z is listed as discontinued in some distributor records.