24FC256-I/SM

Memory IC Overview

The Microchip Technology 24FC256-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, dropping 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 non-volatile storage
• Data acquisition applications needing low-power memory
• Industrial control systems operating in harsh environments

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 datasheet revision matches the required specifications for voltage and timing characteristics. Ensure compatibility with the host system's I²C bus voltage levels and pull-up resistor requirements before finalizing procurement orders.

Memory IC Selection Notes

Select this component when a 1 MHz I²C interface speed is required compared to the standard 400 kHz offered by other variants in the family. It is suitable for designs needing operation down to 1.7V, unlike the 2.5V minimum of the 24LC256 variant. Consider the 8-SOIJ package dimensions if space constraints differ from standard SOIC or MSOP footprints.

Memory IC Part Context

This part belongs to the 24XX256 family of 256-Kbit EEPROMs, which includes the 24AA256 and 24LC256 models. While sharing similar architecture and pinouts, the 24FC256 is distinguished by its support for 1 MHz clock frequencies. The 'I' designation indicates the industrial temperature grade, and '/SM' specifies the 8-lead Small Outline Integrated Circuit (J-leads) package.

Memory IC Replacement Considerations

The 24AA256-I/SM offers identical packaging and voltage ranges but is limited to 400 kHz operation. The 24LC256-I/SM shares the package but requires a minimum of 2.5V and also operates at 400 kHz. Direct functional replacement requires verifying that the reduced clock speed of these alternatives meets the system timing requirements.