HM5112805

HM5112805/HM5113805 128M-bit Dynamic RAM Technical Summary

Overview

The Hitachi HM5112805F and HM5113805F are high-performance 128M-bit dynamic RAMs (DRAMs) organized as 16,777,216 words × 8 bits. These devices leverage advanced CMOS process technology to achieve low power consumption while maintaining high-speed operation. The HM5112805F and HM5113805F support Extended Data Out (EDO) Page Mode, enabling faster access times for improved system performance. These DRAMs are designed for applications requiring reliable, high-density memory with efficient power management.

Key Features

• Single 3.3V Power Supply: Operates at 3.3V ± 0.3V, making it suitable for low-voltage systems.
• High-Speed Access Time: Maximum access time of 60 ns, ensuring rapid data retrieval.
• Low Power Consumption:
  • Active Mode:
    • 720 mW (max) for HM5112805F
    • 792 mW (max) for HM5113805F
  • Standby Mode:
    • 3.6 mW (max) with CMOS interface
    • 1.8 mW (max) for L-version with CMOS interface
• EDO Page Mode Support: Enhances performance by allowing faster sequential data access.
• Flexible Refresh Options:
  • RAS-Only Refresh: 8192 cycles/64 ms (HM5112805F), 4096 cycles/64 ms (HM5113805F)
  • CBR/Hidden Refresh: 4096 cycles/64 ms (both variants)
• Battery Backup Operation: Available in L-version for power-sensitive applications.
• Self-Refresh Capability: L-version supports self-refresh for reduced power consumption during standby.

Applications

The HM5112805F and HM5113805F are ideal for a wide range of applications requiring high-density, low-power memory solutions, including:

• Computer Systems: Main memory for desktops, laptops, and embedded computing platforms.
• Networking Equipment: Buffering and packet storage in routers, switches, and gateways.
• Consumer Electronics: High-performance memory for gaming consoles, set-top boxes, and digital TVs.
• Industrial Systems: Data logging, control systems, and automation equipment.
• Battery-Powered Devices: L-version is suitable for portable electronics due to its low standby power consumption.

Electrical Characteristics

The following table summarizes the key electrical specifications of the HM5112805F and HM5113805F DRAMs:

• Supply Voltage (V_CC): 3.3V ± 0.3V
• Operating Temperature Range: Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
• Input/Output Logic Levels: TTL-compatible
• Access Time (t_AA): 60 ns (max)
• Active Power Dissipation:
  • HM5112805F: 720 mW (max)
  • HM5113805F: 792 mW (max)
• Standby Power Dissipation:
  • Standard: 3.6 mW (max)
  • L-version: 1.8 mW (max)

Refresh Modes

The HM5112805F and HM5113805F support multiple refresh modes to accommodate different system requirements:

• RAS-Only Refresh: Requires external control of the RAS signal.
• CAS-Before-RAS (CBR) Refresh: Simplifies refresh control by using CAS before RAS.
• Hidden Refresh: Allows refresh cycles to occur without disrupting ongoing operations.
• Self Refresh (L-version): Automatically refreshes data during standby, reducing power consumption.

Package Information

The HM5112805F and HM5113805F are available in industry-standard packages for easy integration into various systems. Key package details include:

• Package Type: 400-mil SOJ (Small Outline J-Lead)
• Pin Count: 28 pins
• Dimensions: Standard SOJ footprint for compatibility with existing designs.

Ordering Information

The following part numbers are available for ordering:

• HM5112805F: Standard version with RAS-only refresh (8192 cycles/64 ms)
• HM5113805F: Variant with RAS-only refresh (4096 cycles/64 ms)
• L-Version: Includes self-refresh and battery backup support (e.g., HM5112805F-L)

Conclusion

The Hitachi HM5112805F and HM5113805F DRAMs provide a robust, high-performance memory solution for applications requiring 128M-bit density and low power consumption. With features like EDO Page Mode, multiple refresh options, and battery backup support, these devices are well-suited for a wide range of computing, networking, and consumer electronics applications. Their 3.3V operation and industry-standard packaging ensure seamless integration into modern system designs.