ISL1208IB8

Real Time Clock Overview

The ISL1208IB8 is a low-power real-time clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It features an I2C bus 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, and includes calendar registers for date, month, year, and day of the week, accurate through 2099 with automatic leap year correction. It incorporates 2 bytes of battery-backed user SRAM and supports automatic backup switching between main power and a backup source such as a rechargeable battery or supercapacitor. The component is housed in an 8-lead SOIC package.

Real Time Clock Feature Summary

• I2C Interface: Supports standard and fast mode communication up to 400 kHz.
• Calendar Functionality: Tracks time and date with automatic leap year correction valid through 2099.
• Battery Backup Switching: Automatically switches to backup power upon main power failure without external components.
• Frequency Compensation: Digital oscillator compensation corrects crystal frequency drift across temperature ranges.

Real Time Clock Applications

• Utility meters requiring precise timekeeping and low standby current.
• HVAC equipment needing calendar-based scheduling and logging.
• Set-top boxes and television systems for program guide synchronization.
• Network routers, hubs, and switches for timestamping network events.

Real Time Clock Procurement Notes

Verify the specific suffix against the manufacturer's official documentation, as variations such as IB8Z or IB8Z-TK indicate differences in packaging (tube vs. reel) or labeling updates. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Cross-reference the part number with the latest datasheet revision to ensure compatibility with existing design specifications.

Real Time Clock Selection Notes

Select this component when a small footprint RTC with integrated SRAM and automatic power fail detection is required. Ensure the application environment stays within the -40°C to +85°C operating temperature range. Verify that the system design can accommodate an external 32.768 kHz crystal connected to the X1/X2 pins for oscillator operation.

Real Time Clock Part Context

The ISL1208 belongs to the ISL1208 family of real-time clocks from Renesas. It shares pinout compatibility with devices from other manufacturers, facilitating drop-in replacements in certain designs. The IB8 designation specifically refers to the 8-lead Small Outline Integrated Circuit (SOIC) package variant within this product line.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided reference material. Designers should consult the manufacturer's official cross-reference tools or datasheets for verified equivalent components before implementation.