AT28HC256F-70JI

Memory IC Overview

The AT28HC256F-70JI is a high-performance electrically erasable and programmable read-only memory manufactured by Microchip Technology. It features a storage capacity of 256 kbit organized as 32K x 8 bits. The device offers a fast random access time of 70 ns with an active current consumption of 80 mA and a standby current of 0.3 mA. It operates on a single 5V ± 10% power supply and supports industrial temperature ranges from -40°C to +85°C. The component utilizes CMOS technology for low power dissipation and includes hardware and software data protection mechanisms.

Memory IC Feature Summary

• Supports automatic page write operations with internal address and data latches for up to 64 bytes.
• Includes DATA Polling and Toggle Bit functions to detect the end of write cycles.
• Features hardware and software data protection to prevent inadvertent writes during power transitions.
• Provides an extra 64 bytes of EEPROM memory for device identification or tracking.

Memory IC Applications

• Industrial control systems requiring nonvolatile data storage
• Embedded applications needing fast parallel EEPROM access
• Systems utilizing software data protection algorithms

Memory IC Procurement Notes

Verify that the ordering suffix 'JI' corresponds to the Industrial temperature range (-40°C to +85°C) and the PLCC package type. Confirm the 'F' option indicates the Fast Write cycle time of 3 ms maximum. Ensure compatibility with the host system's voltage levels and interface requirements before procurement.

Memory IC Selection Notes

Select this part when a 70 ns access time and industrial temperature rating are required. The PLCC package is suitable for surface mount applications where specific pin counts are needed. Consider the Fast Write option if shorter programming times are necessary compared to standard devices.

Memory IC Part Context

This component belongs to the AT28HC256 family of high-speed parallel EEPROMs. It is designed for applications requiring reliable nonvolatile storage with fast read and write capabilities. The device is compatible with JEDEC standards and offers various package options including PLCC, PDIP, and SOIC.

Memory IC Replacement Considerations

AT28HC256-70JI (Standard endurance variant)

Memory IC FAQ

What is the function of the extra 64 bytes of EEPROM?

The additional 64 bytes can be used for device identification or tracking purposes by raising A9 to 12V.

How does the Software Data Protection (SDP) feature work?

SDP prevents inadvertent writes by requiring a specific three-byte command sequence to enable or disable the protection state.