The UM61256AK-15 is a 32K x 8 bit (256 Kbit) Static Random Access Memory (SRAM) manufactured by UMC Corporation. SRAMs are a type of semiconductor memory that retains data as long as power is supplied. Unlike DRAM, SRAM does not need to be periodically refreshed, making it faster and simpler to use, but also more expensive and less dense.

Applications

• Embedded Systems: Used as a primary memory component in embedded systems requiring fast and reliable data storage.
• Cache Memory: Employed as cache memory in microprocessors and other digital systems to speed up data access.
• Industrial Control Systems: Integrated into industrial control equipment for data logging and program storage.
• Medical Devices: Utilized in medical devices where high reliability and low power consumption are critical.
• Communication Equipment: Used in routers, switches, and other communication devices for data buffering and control.

Features

• Fast Access Time: The "-15" in the part number indicates a typical access time of 15 nanoseconds, enabling high-speed operation.
• Low Power Consumption: Designed for low power operation, making it suitable for battery-powered applications.
• Single 5V Power Supply: Operates from a single 5V power supply, simplifying system design.
• TTL Compatible Inputs and Outputs: Interfaces easily with standard TTL logic circuits.
• Three-State Outputs: Allows for easy memory expansion and bus sharing.

Benefits

• High-Speed Operation: Enables fast data access and improves system performance.
• Low Power Consumption: Extends battery life and reduces energy costs.
• Easy to Use: Simple interface simplifies system design and integration.
• Reliable Data Storage: Ensures data integrity and prevents data loss.
• Wide Operating Temperature Range: Operates reliably in a variety of environments.

Additional Details

The UM61256AK-15 is typically available in a 28-pin DIP (Dual In-line Package) or SOIC (Small Outline Integrated Circuit) package. The memory is organized as 32,768 words of 8 bits each. The device supports read and write operations controlled by chip enable (CE), output enable (OE), and write enable (WE) signals. It operates over a wide temperature range, typically from -40°C to +85°C, making it suitable for industrial and automotive applications.

The address inputs (A0-A14) select one of the 32,768 memory locations. During a write operation, data is written into the selected memory location when CE and WE are low. During a read operation, data is read from the selected memory location when CE and OE are low. The three-state outputs allow multiple memory devices to be connected to the same data bus.