24FC256T-I/SM

Memory IC Overview

The Microchip Technology 24FC256T-I/SM is a 256-Kbit (32K x 8) Serial Electrically Erasable PROM (EEPROM) utilizing an I²C compatible two-wire serial interface. It operates across a broad voltage range of 1.7V to 5.5V with a maximum clock frequency of 1 MHz at VCC ≥ 2.5V, reducing to 400 kHz below that threshold. The device features a 64-byte page write buffer, hardware write-protect capability via the WP pin, and Schmitt trigger inputs for noise suppression. It supports random and sequential reads up to the 256K boundary and allows cascading up to eight devices on the same bus.

Memory IC Feature Summary

• Supports high-speed 1 MHz operation within specified voltage ranges
• Includes a 64-byte page write buffer for efficient data writing
• Features hardware write protection controlled by the WP pin
• Provides Schmitt trigger inputs to suppress noise spikes

Memory IC Applications

• Personal communications systems requiring low-power non-volatile storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I²C bus architectures for configuration memory

Memory IC Procurement Notes

Verify the specific suffix 'I/SM' corresponds to the Industrial temperature range (-40°C to +85°C) and the 8-Lead SOIJ package type. Confirm the 'T' prefix indicates tape and reel packaging rather than tube or cut tape. Ensure the source documentation explicitly lists this exact part number variant to avoid confusion with standard SOIC packages.

Memory IC Selection Notes

Select this component when a 1 MHz I²C interface speed is required alongside a wide 1.7V to 5.5V supply range. It is suitable for designs needing hardware write protection and noise immunity through Schmitt triggers. Consider the 8-SOIJ package dimensions if board space constraints differ from standard SOIC footprints.

Memory IC Part Context

This device belongs to the 24XX256 family, which includes the 24AA256 and 24LC256 variants. While sharing similar architecture and capacity, the 24FC256 distinguishes itself with support for higher clock frequencies up to 1 MHz compared to the 400 kHz limit of other family members. All variants share common electrical characteristics and pinouts.

Memory IC Replacement Considerations

The 24AA256 and 24LC256 are functionally similar but limited to 400 kHz operation. Verify if the system timing requirements can accommodate the lower speed before substituting. Other packages in the 24FC256 family, such as TSSOP or MSOP, may serve as physical replacements if pin compatibility is maintained.