The DM74S287AN is a 1024-Bit Programmable Read-Only Memory (PROM) organized as 256 words of 4 bits each. It's a TTL (Transistor-Transistor Logic) device manufactured by National Semiconductor (now Texas Instruments). PROMs are non-volatile memory devices where the data can be written once using a PROM programmer.

Applications

• Address Decoding
• Code Conversion
• Lookup Tables
• Character Generators
• Microprogram Storage

Features

• 1024-Bit Memory Organized as 256 x 4
• High Speed: Typical Access Time of 25 ns
• TTL Compatible Inputs and Outputs
• Open Collector Outputs
• Programming via Fusible Links
• DIP (Dual In-Line Package) for Through-Hole Mounting

Benefits

• Fast and Reliable Non-Volatile Memory Storage
• Simple Implementation of Custom Logic Functions
• Suitable for High-Speed Digital Systems
• Easy Programming with Standard PROM Programmers
• Cost-Effective Solution for Small Memory Requirements

Technical Specifications

The DM74S287AN operates with a 5V power supply. It features open-collector outputs, requiring pull-up resistors for proper operation. The device is programmed by selectively blowing fusible links within the memory array. The typical access time is 25 ns. Consult the official National Semiconductor (Texas Instruments) datasheet for detailed electrical characteristics, timing diagrams, and programming instructions.