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NMC27C256Q-20 from NSC,National Semiconductor

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NMC27C256Q-20

Manufacturer: NSC, NS

200 ns, Vcc=5V+/-5%, 262,144-bit (32k x 8) UV erasable CMOS PROM

Partnumber Manufacturer Quantity Availability
NMC27C256Q-20,NMC27C256Q20 NSC, NS 143 In Stock

Description and Introduction

200 ns, Vcc=5V+/-5%, 262,144-bit (32k x 8) UV erasable CMOS PROM **Introduction to the NMC27C256Q-20 EPROM**  

The NMC27C256Q-20 is a high-performance 256 Kbit (32K x 8) erasable programmable read-only memory (EPROM) designed for applications requiring reliable non-volatile data storage. Operating at a 200 ns access time, this component is well-suited for embedded systems, industrial controls, and legacy computing applications where firmware or critical data must be retained without power.  

Housed in a durable 28-pin ceramic or plastic DIP package, the NMC27C256Q-20 features a wide operating voltage range and compatibility with standard EPROM programmers. Its UV-erasable design allows for multiple reprogramming cycles, making it ideal for development and prototyping. The device supports a straightforward parallel interface, ensuring seamless integration with microprocessors and microcontrollers.  

With a robust architecture and industrial-grade reliability, the NMC27C256Q-20 provides a cost-effective solution for systems requiring long-term data retention. Its low-power consumption and high noise immunity further enhance its suitability for demanding environments. While newer flash memory technologies have largely replaced EPROMs in modern designs, this component remains a dependable choice for legacy systems and specialized applications.  

For engineers working with older hardware or seeking a proven memory solution, the NMC27C256Q-20 continues to offer performance and durability.

Application Scenarios & Design Considerations

200 ns, Vcc=5V+/-5%, 262,144-bit (32k x 8) UV erasable CMOS PROM

Alternative Part Number

  • M27C256B-20F1 --: Pin-compatible 256Kbit UV EPROM with 200ns access time, widely available and a direct functional replacement.
  • AM27C256-200DC --: Equivalent 32K x 8 CMOS EPROM with 200ns speed, same DIP-28 pinout and JEDEC-compatible programming.
  • TMS27C256-20JL --: 256Kbit UV-erasable EPROM with 200ns access time, pin-compatible DIP-28 package suitable as a drop-in substitute.

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