24FC256T-I/ST

Memory IC Overview

The Microchip Technology 24FC256T-I/ST is a 32K x 8 (256 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates across a broad voltage range of 1.7V to 5.5V and supports a maximum clock frequency of 1 MHz at VCC ≥ 2.5V, dropping to 400 kHz for voltages below 2.5V. The device utilizes an I2C compatible two-wire serial interface and features a 64-byte page write buffer with a maximum write cycle time of 5 ms. It is housed in an 8-lead TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports high-speed operation up to 1 MHz at supply voltages of 2.5V or higher.
• Features hardware write protection via the WP pin to secure data integrity.
• Includes Schmitt trigger inputs on SDA and SCL lines for enhanced noise suppression.
• Provides output slope control mechanisms designed to eliminate ground bounce effects.

Memory IC Applications

• Personal communications devices requiring low-power non-volatile storage
• Data acquisition systems needing reliable parameter retention
• Industrial control applications utilizing I2C bus architectures

Memory IC Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the 'I' designation matches the required industrial temperature range specifications for your specific application environment. Ensure compatibility with the 1 MHz clock speed requirements if operating above 2.5V.

Memory IC Selection Notes

Select this component over the 24LC256 variant if operation below 2.5V is required, as the 24LC256 minimum voltage is 2.5V. Choose this part over the 24AA256 if a maximum clock frequency of 1 MHz is necessary for system performance. Ensure the TSSOP package format aligns with the printed circuit board layout constraints.

Memory IC Part Context

This device belongs to the 24XX256 family of serial EEPROMs from Microchip Technology. It shares functional similarities with the 24AA256 and 24LC256 but offers distinct electrical characteristics regarding voltage ranges and clock speeds. The family supports cascading up to eight devices on a single bus using hardware address pins.

Memory IC Replacement Considerations

24FC256-I/SM

Memory IC FAQ

How does the clock frequency change based on supply voltage?

The device supports 1 MHz operation when VCC is between 2.5V and 5.5V. When VCC is between 1.7V and 2.5V, the maximum clock frequency is limited to 400 kHz.

What is the function of the WP pin?

The Write-Protect (WP) pin allows hardware control over write operations. Tying WP to VSS enables writing, while tying it to VCC inhibits all write cycles to protect the memory array.