AT29C020-90PI

Memory IC Overview

The AT29C020-90PI is a 5-volt-only in-system Flash programmable and erasable read-only memory (PEROM) manufactured by Microchip Technology. It provides 2 megabits of storage organized as 262,144 bytes. The device features a 90 ns access time and operates on a single 5V ±10% supply. It supports sector-based programming with 1024 sectors of 256 bytes each. The industrial temperature range version (-40°C to +85°C) draws 40 mA active current and less than 300 µA standby current. It utilizes a parallel interface and is housed in a 32-pin Plastic Dual Inline Package (PDIP).

Memory IC Feature Summary

• Supports 5-volt-only reprogramming without requiring high input voltages.
• Features sector-based program operations with internal address and data latches for 256-byte loads.
• Includes hardware and software data protection mechanisms against inadvertent writes.
• Provides two 8K-byte boot blocks with independent programming lockout capabilities.

Memory IC Applications

• In-system reprogrammable code storage for microcontroller applications.
• Secure boot code storage utilizing the dedicated boot block lockout feature.
• Data logging or configuration parameter storage requiring sector-level updates.

Memory IC Procurement Notes

Verify that the specific ordering suffix 'PI' corresponds to the Industrial temperature range (-40°C to +85°C) and the PDIP package type. Confirm the manufacturer source, as Atmel was acquired by Microchip Technology, ensuring the component matches the original Atmel specifications. Check for end-of-life status or obsolescence notices before finalizing procurement plans.

Memory IC Selection Notes

Select this component when a 2-megabit nonvolatile memory solution with sector erase capabilities is required. Ensure the design accommodates the 32-pin PDIP footprint if through-hole mounting is necessary. Verify that the system voltage remains within the 5V ±10% specification and that the timing requirements align with the 90 ns access speed. Consider the industrial temperature rating if the application environment exceeds commercial limits.

Memory IC Part Context

This part belongs to the AT29C series of 5-volt-only Flash memories originally developed by Atmel Corporation. The series offers various densities and access speeds, with the AT29C020 providing 2 Mbit capacity. The 'P' indicates the PDIP package, while 'I' denotes the industrial temperature grade. This family allows for direct EPROM replacement in many legacy designs due to compatible pinouts and operation modes.

Memory IC Replacement Considerations

Compatible substitutes include other AT29C020 variants with different access times or packages, such as AT29C020-70PI or AT29C020-10PI. Cross-reference with Microchip's current portfolio for equivalent density Flash devices if the AT29C series is discontinued. Ensure any replacement maintains the 5V-only operation and sector size compatibility.