AT29C040A-12JI

Memory IC Overview

The AT29C040A-12JI is a 5-volt only in-system Flash Programmable and Erasable Read Only Memory (PEROM) manufactured by Atmel. It provides 4 megabits of storage organized as 524,288 words by 8 bits. The device features a fast read access time of 120 ns maximum and operates within an industrial temperature range of -40°C to +85°C. It utilizes a single 5V ± 10% supply voltage with CMOS and TTL compatible inputs and outputs.

Memory IC Feature Summary

• Supports sector-based programming operations with internal address and data latches for 256-byte sectors.
• Includes hardware and software data protection mechanisms to prevent inadvertent writes.
• Features two 16K-byte boot blocks with independent programming lockout capabilities.
• Provides DATA polling and toggle bit functions to detect the end of program or erase cycles.

Memory IC Applications

• In-system reprogrammable code storage
• Boot block memory for system initialization
• Data retention applications requiring sector-level updates

Memory IC Procurement Notes

Verify the manufacturer origin, as Atmel was acquired by Microchip Technology. Confirm the specific suffix 'JI' corresponds to the Industrial temperature grade (-40°C to +85°C) and TSOP package type. Check for current datasheet revisions and obsolescence status, as the document notes this component is not recommended for new designs.

Memory IC Selection Notes

Select this component for legacy systems requiring 5-volt only Flash memory with sector erase capabilities. Ensure the design accommodates the 32-lead TSOP package. Consider that the device requires specific command sequences for software data protection and boot block lockout. Verify compatibility with existing EPROM-like interface requirements.

Memory IC Part Context

This part belongs to the AT29C040A family of 4-megabit Flash memories. It is distinct from EEPROM variants like the 25LC040 series which use SPI interfaces. The 'J' indicates a PLCC package in some contexts but here refers to the specific ordering code combination for the Industrial grade TSOP variant as per the provided table.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the source material. However, other speed grades within the same family such as AT29C040A-90JI or AT29C040A-15JI may be considered if timing requirements allow. Cross-vendor replacements require careful verification of pinouts and voltage levels.