AT28C64-25TI

Memory IC Overview

The AT28C64-25TI is a 64K (8K x 8) parallel EEPROM manufactured by Microchip Technology. It features a 250 ns maximum access time and operates on a single 5V ± 10% power supply. The device utilizes a 28-lead Plastic Thin Small Outline Package (TSOP). It supports industrial temperature ranges from -40°C to +85°C, with active current of 30 mA and standby current under 100 µA.

Memory IC Feature Summary

• Self-timed byte write cycle with internal address and data latches
• Direct microprocessor control via READY/BUSY open drain output and DATA polling
• Hardware protection against inadvertent writes using VCC sense and power-on delay

Memory IC Applications

• Nonvolatile data storage in industrial embedded systems
• Configuration memory for microprocessor-based controllers
• Device identification and tracking applications

Memory IC Procurement Notes

Verify the specific ordering suffix 'TI' corresponds to the TSOP package and industrial temperature range (-40°C to +85°C) as defined in the official Microchip AT28C64 datasheet. Confirm that the standard endurance rating of 10,000 write cycles meets project requirements, noting that high endurance variants require an 'E' suffix. Ensure compatibility with existing PCB footprints for the 28-lead TSOP form factor.

Memory IC Selection Notes

Select this component when a 250 ns access speed is sufficient for the system bus timing. The TSOP package is suitable for surface-mount assembly processes requiring a low-profile footprint. Consider the standard 1 ms write cycle time; if faster programming is required, evaluate the AT28C64E variant which offers a 200 µs write time. Verify voltage levels match the 5V ± 10% supply specification.

Memory IC Part Context

This part belongs to the AT28C64 family of 64Kbit parallel EEPROMs produced by Atmel, now Microchip Technology. The series provides CMOS nonvolatile memory solutions with JEDEC-approved pinouts. The AT28C64X variant within this family includes additional device identification bytes accessible via special voltage commands.

Memory IC Replacement Considerations

AT28C64-25TC: Identical electrical specifications but housed in a 28-lead SOIC package instead of TSOP.