STMicroelectronics

M27C256B-90C1  

Memory ICs Products

M27C256B-90C1 Description

The M27C256B-90C1 is a 256Kbit (32K x 8) parallel EPROM from STMicroelectronics, designed for applications requiring reliable non-volatile memory storage. Operating within a 4.5V to 5.5V supply range, this device features a 90ns access time, making it suitable for high-performance embedded systems. Housed in a 32-pin PLCC (Plastic Leaded Chip Carrier) package, it supports surface-mount assembly and is RoHS3 compliant, ensuring adherence to environmental standards. Although marked as obsolete, it remains a robust solution for legacy designs due to its parallel interface and EPROM architecture, which allows for UV-erase reprogrammability.

M27C256B-90C1 Features

• Memory Organization: 32K x 8 configuration, ideal for byte-wide data storage.
• High-Speed Access: 90ns access time ensures efficient data retrieval for time-critical applications.
• Wide Voltage Range: Operates at 4.5V–5.5V, compatible with standard TTL logic levels.
• Surface-Mount Design: 32PLCC package enables compact PCB integration.
• UV-Erasable: EPROM format allows for multiple reprogramming cycles after UV exposure.
• Robust Compliance: RoHS3 and REACH unaffected, suitable for environmentally conscious designs.
• Extended Temperature Range: Operates reliably from 0°C to 70°C, making it suitable for industrial and consumer applications.

M27C256B-90C1 Applications

• Legacy Embedded Systems: Ideal for firmware storage in older industrial controllers and automation equipment.
• Retro Computing: Used in vintage computer restoration due to its compatibility with classic architectures.
• Automotive Electronics: Suitable for non-volatile memory in pre-OBD-II vehicle ECUs (where obsolescence is manageable).
• Medical Devices: Reliable storage for fixed-code applications in older medical instrumentation.
• Telecommunications: Backup memory for legacy telecom hardware requiring infrequent updates.

Conclusion of M27C256B-90C1

The M27C256B-90C1 is a dependable parallel EPROM for legacy systems, offering high-speed access, UV-erase capability, and broad voltage compatibility. While obsolete for new designs, its 32K x 8 organization and industrial-grade temperature range make it a practical choice for maintenance, repairs, or retrofitting older electronics. Engineers working with vintage or long-lifecycle systems will find it a valuable component for ensuring continuity in specialized applications.

M27C256B-90C1 Documents

Download datasheets and manufacturer documentation for M27C256B-90C1

Datasheets :

M27C256B      

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M27C256B