ISL1209IU10Z-TK

Real Time Clock Overview

The ISL1209IU10Z-TK is a low-power real-time clock/calendar manufactured by Renesas Electronics. It operates on an I2C bus interface with a maximum data transfer rate of 400kHz. The device supports a supply voltage range from 2.7V to 5.5V and includes automatic backup switching to a battery or supercapacitor. It features a 2-byte battery-backed user SRAM and tracks time in HH:MM:SS (24-hour) format, with date tracking in YY-MM-DD-dd format including day of the week. The component is housed in a 10-lead MSOP package and functions within a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• I2C Serial 2-Wire Interface with 400kHz Data Transfer Rate
• Automatic Backup Switching to Battery or Supercapacitor
• 2 Bytes Battery-Backed User SRAM
• Calendar Accurate Through 2099 with Automatic Leap Year Correction

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the specific suffix 'TK' against the official Renesas datasheet to confirm packaging details such as reel size or tape specifications. Ensure the operating environment remains within the specified -40°C to +85°C range. Confirm that the I2C bus voltage levels are compatible with the system's logic levels, as the device supports 2.7V to 5.5V operation. Check for RoHS compliance status if required by local regulations.

Real Time Clock Selection Notes

Select this component when a compact MSOP-10 footprint is required for I2C-based timekeeping. It is suitable for applications needing minimal battery-backed memory (2 bytes) alongside standard calendar functions. Consider the 400nA typical battery supply current for power-sensitive designs. Verify that the external 32.768kHz crystal requirements align with the system's oscillator compensation capabilities.

Real Time Clock Part Context

The ISL1209 belongs to the ISL1209 series of real-time clocks from Renesas/Intersil. It shares pinout compatibility with legacy devices like ST M41Txx and Maxim DS13xx families, facilitating drop-in replacements in existing designs. The 'U10' designation typically indicates the MSOP-10 package variant within this product line.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements include other models from the ISL1208/ISL1209 family, provided they match the MSOP-10 package and I2C interface. Verify that any substitute maintains the same 2.7V-5.5V supply range and 400kHz I2C speed. Cross-reference the specific suffix codes for packaging differences.