ISL1208IB8Z-T7A

Real Time Clock Overview

The ISL1208IB8Z-T7A is a low-power real-time clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics Corporation. It operates via an I2C, 2-wire serial interface with a maximum data transfer rate of 400kHz. The device supports a supply voltage range of 2.7V to 5.5V and a battery backup voltage of 1.8V to 5.5V. Timing current consumption ranges from 4µA to 6µA at 3V to 5V. It features automatic leap year correction through 2099, one alarm, and 2 bytes of battery-backed SRAM. The component is housed in an 8-SOIC package (0.154"/3.90mm wide) and functions within a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Interface: Supports 400kHz data transfer rate for efficient communication.
• Calendar Functionality: Tracks hours, minutes, seconds, day of week, date, month, and year with automatic leap year correction through 2099.
• Battery Backup: Includes automatic backup switching and 2 bytes of user-accessible SRAM protected by a backup power source.
• Alarm System: Features a single programmable alarm settable to the second, minute, hour, day of week, day, or month.

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the specific suffix T7A corresponds to the tape-and-reel packaging configuration when sourcing. Confirm that the 8-SOIC footprint matches the target PCB design constraints. Ensure compatibility with the required I2C bus voltage levels and check for any recent Product Change Notifications regarding labeling or assembly sources.

Real Time Clock Selection Notes

Select this part for applications requiring precise timekeeping with minimal power consumption in a standard SOIC package. Compare against the ISL1208IU8Z variant if a smaller MSOP package is preferred. Verify that the 400nA battery supply current meets the standby power requirements of the system design.

Real Time Clock Part Context

This component belongs to the ISL1208 family of real-time clocks. It shares pinout compatibility with ST M41Txx and Maxim DS13xx devices, facilitating drop-in replacements in existing designs. The IB8Z designation specifically indicates the industrial temperature grade and SOIC package style within the broader product line.

Real Time Clock Replacement Considerations

The ISL1208IU8Z serves as a package-compatible alternative using an 8-MSOP form factor. Designers should verify pin-to-pin compatibility and ensure that the reduced physical dimensions of the MSOP package fit within the mechanical constraints of the enclosure.