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The HY658256S-15 is a high-speed CMOS static RAM (SRAM) manufactured by Hyundai (now SK Hynix). Below are its specifications, descriptions, and features:

Specifications:

• Type: 256K x 8-bit (2Mbit) CMOS Static RAM
• Organization: 262,144 words × 8 bits
• Access Time: 15 ns
• Operating Voltage: 5V ±10%
• Operating Current: 120 mA (max)
• Standby Current: 20 mA (max) in CMOS mode
• Package: 28-pin SOP (Small Outline Package) or DIP (Dual In-line Package)
• Operating Temperature Range: 0°C to 70°C (Commercial)
• Data Retention Voltage: 2V (min)
• Pin Configuration: Compatible with industry-standard 256K x 8 SRAMs

Descriptions:

• The HY658256S-15 is a high-performance, low-power CMOS SRAM designed for applications requiring fast access times and low power consumption.
• It features a fully static operation, eliminating the need for external refresh cycles.
• The device is suitable for cache memory, embedded systems, networking equipment, and other high-speed computing applications.

Features:

• High-Speed Access: 15 ns access time
• Low Power Consumption:
• Active current: 120 mA (max)
• Standby current: 20 mA (max) in CMOS mode
• Fully Static Operation: No clock or refresh required
• TTL-Compatible Inputs/Outputs
• Single 5V Power Supply
• Tri-State Outputs for bus compatibility
• Industrial Standard Pinout for easy replacement

This SRAM is widely used in legacy systems, industrial controls, and embedded applications where fast, reliable memory access is required.