ISL1208IU8-TK

Real Time Clock Overview

The ISL1208IU8-TK is a low-power real-time clock (RTC) integrated circuit manufactured by Renesas Electronics, formerly Intersil. It features an I2C interface with a maximum data transfer rate of 400 kHz and operates within a supply voltage range of 2.7 V to 5.5 V. The device tracks time in hours, minutes, and seconds, with calendar registers accurate through 2099, including automatic leap year correction. It includes 2 bytes of battery-backed user SRAM and supports frequency compensation for external 32.768 kHz crystals. The component is housed in an 8-lead MSOP package and functions across a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Interface: Supports standard and fast mode communication up to 400 kHz.
• Calendar Functionality: Tracks date, day of week, month, and year with automatic leap year correction through 2099.
• Battery Backup: Automatic switching between main power and backup source (battery or super capacitor) with 400 nA battery supply current.
• Frequency Compensation: On-chip digital oscillator compensation corrects crystal frequency drift within a range of -94 ppm to +140 ppm.

Real Time Clock Applications

• Smart Home Appliances requiring precise timekeeping and calendar functions.
• Industrial Control Systems needing reliable RTC with I2C connectivity.
• Automotive Infotainment and Telematics units (AEC-Q100 qualified variants available).

Real Time Clock Procurement Notes

Verify the specific suffix 'TK' against official Renesas documentation to confirm tape-and-reel packaging specifications. Check for End-of-Life (EOL) notices or Product Change Notifications (PCN) as Intersil products may have transitioned statuses under Renesas Electronics Corporation. Confirm RoHS compliance and moisture sensitivity level (MSL) ratings prior to procurement.

Real Time Clock Selection Notes

Select this component when a compact 8-lead MSOP package is required for space-constrained designs. Ensure the application utilizes an external 32.768 kHz crystal for oscillator operation. Verify that the system voltage remains within the 2.7 V to 5.5 V operating range. Consider the 400 nA standby current if battery longevity is a critical design parameter.

Real Time Clock Part Context

The ISL1208 belongs to the ISL1208 family of real-time clocks from Intersil, now part of Renesas Electronics. This series is designed to replace legacy RTCs like the Maxim DS13xx and ST M41Txx due to pin compatibility and enhanced features such as on-chip frequency compensation. The IU8 variant specifically denotes the 8-lead MSOP package option.

Real Time Clock Replacement Considerations

ISL1208IU8Z is a direct equivalent part number within the same family, differing primarily in packaging format (tube vs. tape/reel depending on suffix). Verify pinout compatibility with existing designs referencing Maxim DS13xx or ST M41Txx series devices.