The DM74189N is a 64-bit Random Access Memory (RAM) organized as 16 words of 4 bits each, manufactured by National Semiconductor (now Texas Instruments). This device is a TTL (Transistor-Transistor Logic) component designed for use in digital systems requiring temporary data storage. It features open-collector outputs, enabling wired-OR configurations for memory expansion.

Applications:

• Scratchpad Memory
• Data Buffering
• Look-up Tables
• Control Memory
• Small-scale Data Storage in Digital Systems

Features:

• 64-bit RAM (16 words x 4 bits)
• TTL Technology
• Open-Collector Outputs
• Fast Access Time
• Separate Read and Write Control Lines

Benefits:

• Temporary Data Storage
• Wired-OR Capability for Memory Expansion
• High-Speed Data Access
• Simple Interface
• Standard TTL Compatibility

Additional Details:

The DM74189N requires a 5V power supply for operation. The open-collector outputs necessitate the use of external pull-up resistors to define the HIGH logic level. The access time of the memory is a critical parameter determining the speed of operation. The device is typically packaged in a 16-pin DIP (Dual In-line Package). For detailed electrical characteristics, timing diagrams, and application examples, refer to the manufacturer's datasheet.