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The MB81C4256A-80P is a high-speed CMOS static RAM (SRAM) manufactured by FUJITSU (FUJ). Below are its key specifications, descriptions, and features:

Specifications:

• Type: 256K-bit (32K x 8-bit) CMOS Static RAM
• Speed: 80ns access time
• Voltage Supply: 5V ±10%
• Operating Temperature Range: Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
• Package: 28-pin DIP (Dual In-line Package)
• Power Consumption:
• Active: ~200mA (typical)
• Standby: ~10μA (typical, CMOS level)
• I/O Interface: TTL-compatible

Descriptions:

• The MB81C4256A-80P is a low-power, high-performance SRAM designed for applications requiring fast access times and low standby current.
• It features a fully static operation, eliminating the need for external refresh cycles.
• The device is compatible with standard microprocessor systems and is suitable for battery-backed or power-sensitive applications.

Features:

• High-Speed Access: 80ns maximum access time
• Low Power Consumption: CMOS technology ensures low standby current
• Easy Interfacing: TTL-compatible inputs and outputs
• No Refresh Required: Fully static operation
• Wide Operating Voltage: 4.5V to 5.5V
• Three-State Outputs: Supports bus-oriented systems

This SRAM is commonly used in embedded systems, industrial controls, telecommunications, and other applications requiring fast, non-volatile memory.

*(Note: Verify datasheet for exact specifications as variations may exist.)*