NM27C512V120

Memory IC Overview

The NM27C512V120 is a 512Kb (64K x 8) UV Erasable Electrically Programmable Read Only Memory (EPROM) manufactured by onsemi. It utilizes CMOS technology to provide high performance with a maximum access time of 120 ns. The device operates within a supply voltage range of 4.5V to 5.5V and supports parallel memory interface. It is housed in a 28-pin Ceramic Dual In-Line Package (CDIP) featuring a quartz window for UV erasure. The component is designed for non-volatile code storage in microprocessor-based systems.

Memory IC Feature Summary

• High-performance CMOS construction ensuring reliability and economy
• Fast turn-off characteristics compatible with microprocessor timing requirements
• Standard JEDEC pinout configuration facilitating system upgrades
• Single-chip solution for firmware-based equipment code storage

Memory IC Applications

• Microprocessor-based system storage for operating system software
• Storage for application software routines
• Firmware-based equipment code storage
• Systems requiring no wait-state operation with high-performance CPUs

Memory IC Procurement Notes

Verify the specific suffix 'V120' against official datasheets to confirm the 120 ns access time variant, as other suffixes may indicate different speeds or packages. Confirm package type availability, as this series also appears in PDIP and chip carrier formats. Check RoHS compliance status, as older EPROM variants often contain lead. Ensure UV erasure capability via the CDIP window is required for your application lifecycle.

Memory IC Selection Notes

Select this component when a 512Kb capacity with 120 ns speed is required for legacy or specialized embedded systems. The CDIP package with a quartz window is essential if field reprogramming via UV light is necessary. Compare against standard EPROM pinouts to ensure compatibility with existing board layouts. Consider power consumption and thermal characteristics relative to the host CPU's data bus speed.

Memory IC Part Context

This part belongs to the 27C512 family of high-density EPROMs. It serves as a non-volatile memory solution for storing fixed program code that requires occasional updates. The technology predates flash memory but remains relevant in specific industrial or aerospace applications where UV erasability and radiation hardness are valued over density.

Memory IC Replacement Considerations

Direct replacements include FM27C512V120 from Fairchild Semiconductor and M27C512-120 from STMicroelectronics. Verify pin compatibility and electrical specifications before substitution. Flash memory equivalents require adapter circuits or software modifications due to different programming interfaces.