24FC256-I/MS

Memory IC Overview

The Microchip Technology 24FC256-I/MS 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, with 400 kHz operation down to 1.7V. The device utilizes a Two-Wire Serial Interface compatible with I²C protocols. It features a 64-byte page write buffer, hardware write-protect capability via the WP pin, and Schmitt trigger inputs for noise suppression. The component is housed in an 8-lead MSOP package and supports industrial temperature ranges.

Memory IC Feature Summary

• Supports high-speed serial data transmission up to 1 MHz under standard operating voltages
• Includes a 64-byte page write buffer to optimize write cycle efficiency
• Features hardware write protection controlled by the dedicated WP pin
• Incorporates Schmitt trigger inputs on SDA and SCL lines for enhanced noise immunity

Memory IC Applications

• Personal communications devices requiring low-power non-volatile storage
• Data acquisition systems needing reliable parameter retention
• Embedded controllers utilizing I²C bus architectures
• Industrial equipment requiring wide voltage tolerance and robust signal integrity

Memory IC Procurement Notes

Verify that the specific ordering suffix corresponds to the MSOP package type and Industrial temperature grade. Confirm that the supply voltage requirements align with the 1.7V to 5.5V operational range specified for the 24FC256 series. Ensure compatibility with I²C bus timing constraints, particularly regarding rise and fall times when operating at higher clock frequencies. Check RoHS compliance documentation if environmental regulations apply to the target assembly.

Memory IC Selection Notes

Select this component when high-speed I²C communication is required alongside low-power consumption. The 24FC256 offers faster clock rates compared to standard variants, making it suitable for bandwidth-sensitive applications. Consider the MSOP package for space-constrained surface-mount designs. Evaluate the need for hardware write protection if system security against accidental overwrites is critical. Verify that the operating voltage environment remains within the specified 1.7V to 5.5V limits for optimal performance.

Memory IC Part Context

This device belongs to the 24XX256 family of 256-Kbit Serial EEPROMs from Microchip Technology. The family includes variants such as the 24AA256 and 24LC256, which share similar memory architectures but differ in minimum operating voltage and maximum clock frequency specifications. The 24FC256 specifically targets applications demanding higher bus speeds while maintaining compatibility with standard I²C protocols.

Memory IC Replacement Considerations

Direct substitutes within the same package and electrical profile include other 24FC256 variants with different temperature grades or packaging options, provided the interface and voltage requirements remain consistent.

Memory IC FAQ

How does the MSOP package affect chip addressing capabilities?

In the MSOP package, pins A0 and A1 are not connected. Consequently, only two devices can be addressed on the same bus, requiring the A0 and A1 Chip Select bits in the control byte to be set to logic '0'.

What is the behavior of the device during an internal write cycle?

During an internally timed write cycle, the device does not generate Acknowledge signals. Host devices can use Acknowledge polling by sending a write command to determine when the cycle is complete.

How is the hardware write protection implemented?

Write protection is controlled by the WP pin. Tying WP to VCC inhibits all write operations to the array, while tying it to VSS enables them. The state is sampled at the Stop bit of every write command.