AT28HC64B-70PC

Memory IC Overview

The AT28HC64B-70PC is a 64K (8K x 8) parallel EEPROM manufactured by Microchip Technology. It features a 70 ns maximum access time and operates on a single 5 V ±10% power supply. The device supports active current of 40 mA and standby current of 100 µA. It utilizes a 28-lead Plastic Dual Inline Package (PDIP).

Memory IC Feature Summary

• Supports automatic page write operations with internal address and data latches for up to 64 bytes.
• Includes hardware and software data protection mechanisms to prevent inadvertent writes.
• Provides DATA Polling and Toggle Bit functionality for end-of-write cycle detection.

Memory IC Applications

• Nonvolatile data storage in industrial control systems.
• Configuration memory for embedded microcontroller applications.
• Device identification and tracking using dedicated extra EEPROM bytes.

Memory IC Procurement Notes

Verify the package type corresponds to the 28-lead PDIP specification when sourcing replacements. Confirm that the operating temperature range matches the commercial or industrial requirements of the target application. Ensure the voltage supply aligns with the specified 5 V ±10% tolerance for proper device operation.

Memory IC Selection Notes

Select this component for designs requiring byte-wide parallel interface compatibility with static RAM-like access. Consider the 70 ns access speed for system timing constraints. Evaluate the need for software data protection features if the application environment poses risks of inadvertent programming during power transitions.

Memory IC Part Context

This part belongs to the AT28HC64B series of high-speed parallel EEPROMs. It is designed for applications needing reliable nonvolatile storage with fast read access. The series offers various speed grades and package options, including PLCC, SOIC, and TSOP, to suit different board layout and performance requirements.

Memory IC Replacement Considerations

Compatible substitutes include AT28HC64B-55PC and AT28HC64B-90PC from the same manufacturer family. These alternatives share identical pinouts and functional specifications but differ in access speed ratings.