AT27C512R-90PI

Memory IC Overview

The AT27C512R-90PI is a 524,288-bit (64K x 8) one-time programmable read-only memory (OTP EPROM) manufactured by Microchip Technology. It operates on a single 5V power supply and features a maximum address-to-output delay of 90 ns. The device utilizes high-reliability CMOS technology with low standby current and supports Rapid programming algorithms. It is housed in a 28-lead Plastic Dual Inline Package (PDIP) and is rated for industrial temperature ranges from -40°C to +85°C.

Memory IC Feature Summary

• Supports Rapid programming algorithm for efficient byte-level writing
• Includes integrated product identification code for manufacturer verification
• Features two-line control logic to prevent bus contention

Memory IC Applications

• Firmware storage in microprocessor systems
• Industrial control applications requiring non-volatile data retention
• Automotive embedded systems operating in harsh environments

Memory IC Procurement Notes

Verify the specific ordering suffix 'PI' corresponds to the Industrial temperature range (-40°C to +85°C) and the 28-lead PDIP package configuration. Confirm that the component is sourced as an OTP EPROM rather than a standard mask ROM or flash variant. Ensure compatibility with existing system voltage levels and programming equipment requirements before procurement.

Memory IC Selection Notes

Select this component when a non-volatile, one-time programmable solution is required for firmware storage in industrial environments. The 90 ns access time suits moderate-speed microprocessor interfaces without necessitating wait states. Consider the PDIP package for through-hole mounting constraints and verify that the single 5V supply requirement aligns with the target system's power architecture.

Memory IC Part Context

This part belongs to the AT27C512R series of OTP EPROMs originally designed by Atmel Corporation, now produced by Microchip Technology following the acquisition. The series offers various speed grades and package options to accommodate different performance and form factor requirements across commercial, industrial, and automotive sectors.

Memory IC Replacement Considerations

Compatible substitutes include other 512Kb OTP EPROMs with similar pinouts and electrical characteristics, such as the AT27C512R-70PI or AT27C512R-12PI. Verify that any replacement maintains the same 28-pin PDIP footprint and industrial temperature rating.