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The TC55257DFL-85L is a high-speed CMOS static RAM (SRAM) manufactured by Toshiba. Below are the factual specifications, descriptions, and features from the Manufactor Datasheet:

Specifications:

• Organization: 32K x 8 (256K-bit)
• Operating Voltage: 5V ±10%
• Access Time: 85 ns
• Operating Temperature Range: -40°C to +85°C
• Package: 28-pin SOP (Small Outline Package)
• Pin Configuration: Compatible with industry-standard 32K x 8 SRAMs
• Standby Current (TTL Level): 10 µA (max)
• Operating Current: 50 mA (max)

Descriptions:

• Technology: High-speed CMOS
• Functionality: Fully static operation, no clock or refresh required
• Data Retention: Guaranteed in standby mode with reduced voltage (2V min)
• I/O Interface: TTL-compatible inputs and outputs
• Control Pins: Includes Chip Enable (CE), Output Enable (OE), and Write Enable (WE)

Features:

• Low Power Consumption: Ideal for battery-backed applications
• High-Speed Access: Suitable for embedded systems and cache applications
• Wide Temperature Range: Supports industrial and automotive applications
• Reliable Data Retention: Ensures stability in power-critical systems
• Industry-Standard Pinout: Easy replacement for similar SRAMs

This information is based solely on the manufacturer's datasheet and technical documentation.