ISL1208IU8

Real Time Clock Overview

The ISL1208IU8Z is a low-power real-time clock (RTC) IC manufactured by Renesas Electronics, formerly Intersil. It features an I2C interface with a 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 battery backup switching, power failure detection, and 2 bytes of battery-backed user SRAM. The component is housed in an 8-lead MSOP package and supports operation temperatures from -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Serial Interface: Supports standard and fast mode operations up to 400kHz.
• Calendar and Clock: Tracks time with separate registers; calendar is accurate through 2099 with automatic leap year correction.
• Battery Backup Switching: Automatically switches between main power and battery/super capacitor upon power failure.
• Low Power Consumption: Battery supply current is typically 400nA.

Real Time Clock Applications

• Three-phase PFC inverters
• LoRaWAN street light controllers for AC loads
• Efficient electromagnetic heaters

Real Time Clock Procurement Notes

The ISL1208IU8Z is listed as End-of-Life (EOL) or obsolete by the manufacturer. Availability is restricted, and procurement should focus on verifying stock status with authorized distributors. Designers planning new products should consider alternative components due to discontinuation risks.

Real Time Clock Selection Notes

Select this component when an I2C-connected RTC with integrated battery backup switching and small form factor is required. Ensure the design accommodates the 8-lead MSOP package dimensions. Verify that the system voltage remains within the 2.7V to 5.5V range and that the I2C bus speed does not exceed 400kHz.

Real Time Clock Part Context

The ISL1208 series is designed to be pin-compatible with ST M41Txx and Maxim DS13xx devices, facilitating drop-in replacements in existing designs. The 'U' suffix denotes the 8-lead MSOP package option, while 'Z' indicates RoHS compliance. This part belongs to the broader family of low-power serial RTCs offered by Renesas/Intersil.

Real Time Clock Replacement Considerations

The ISL1208IU8Z has been discontinued. The ISL1208IU8Z is explicitly listed as a substitute or related part number in distributor databases. Engineers should verify electrical compatibility and pinout alignment before transitioning to any replacement RTC IC.