The TMM41256AP-10 is a high-speed, 262,144-bit (256K) Dynamic Random Access Memory (DRAM) chip from Toshiba Semiconductor and Storage. It is organized as 256K words x 1 bit and is designed for applications requiring fast data access and high memory density. The '-10' indicates an access time of 100ns.

Applications

• Personal Computers: Used as main system memory in older PCs and workstations.
• Graphics Cards: Employed as video memory in early graphics adapters.
• Printers: Served as buffer memory for storing print data.
• Industrial Control Systems: Used in equipment requiring temporary storage of data.
• Telecommunications Equipment: Found in devices like modems and routers as buffer memory.

Features

• High Speed: 100ns access time allows for fast data retrieval and storage.
• High Density: 256Kbit capacity provides substantial memory in a single chip.
• Single 5V Power Supply: Operates on a single 5V power supply, simplifying power requirements.
• Multiplexed Address Inputs: Reduces pin count by multiplexing row and column addresses.
• TTL Compatibility: Compatible with standard TTL logic levels.
• Refresh Required: Requires periodic refreshing to maintain data integrity due to its dynamic nature.

Benefits

• Fast System Performance: High-speed access time improves overall system performance.
• Compact Design: High density reduces board space requirements.
• Simplified Power Supply: Single 5V power supply simplifies design.
• Easy Integration: TTL compatibility ensures easy interfacing with other components.
• Cost-Effective: Provides a cost-effective solution for memory requirements.

Additional Details

The TMM41256AP-10 comes in a 16-pin DIP (Dual In-line Package). It requires a refresh cycle to maintain the stored data, typically performed every few milliseconds. Electrostatic discharge (ESD) precautions are necessary when handling the device. Refer to the Toshiba datasheet for detailed electrical characteristics, timing diagrams, and refresh specifications. It's an N-channel silicon gate MOS device. Its operating temperature range and storage temperature range are specified in the datasheet. It's essential to provide proper decoupling capacitors close to the power pins to minimize noise and ensure reliable operation. Data retention depends on the refresh rate and operating temperature.