The HN27128AG-20 is a high-speed electrically erasable and programmable read-only memory (EEPROM) manufactured by Hitachi, Ltd. This device is organized as 16,384 words by 8 bits, providing a total storage capacity of 128 kilobits. The HN27128AG-20 is designed for applications requiring non-volatile data storage and fast access times.

Applications

• Microcontroller Programs Storage: Used to store the firmware and program code for various microcontroller-based systems.
• Data Logging: Suitable for applications where data needs to be stored and retained even when power is removed.
• Industrial Control Systems: Employed in industrial control equipment for storing configuration parameters and operational settings.
• Embedded Systems: Used in a wide range of embedded systems for storing critical data and boot code.
• Telecommunications Equipment: Utilized in telecommunications devices for storing configuration data and software.

Features

• High-Speed Access: Offers a fast access time of 200ns, enabling quick data retrieval.
• Electrically Erasable and Programmable: Data can be erased and reprogrammed electrically, allowing for in-system updates.
• Non-Volatile Memory: Retains data even when power is removed, ensuring data integrity.
• 128 Kilobit Storage Capacity: Provides ample storage space for various data and program requirements.
• Wide Operating Voltage Range: Operates over a wide voltage range, enhancing its versatility.
• TTL Compatible Inputs/Outputs: Compatible with standard TTL logic levels, simplifying integration with other components.

Benefits

• Improved System Performance: Fast access time contributes to improved system performance.
• Simplified System Updates: Electrical erasability and programmability facilitate easy in-system updates.
• Enhanced Data Security: Non-volatile storage ensures data is retained even during power outages.
• Reduced System Complexity: TTL compatibility simplifies system design and reduces component count.
• Increased Reliability: Robust design and manufacturing ensure high reliability and long-term performance.

Additional Details

The HN27128AG-20 requires a single 5V power supply for operation. It features standard JEDEC pinout for ease of integration. The device is available in a DIP package. Programming and erasure are performed using standard EEPROM programming equipment. The device's high speed and non-volatile nature make it suitable for a variety of applications where data retention and quick access are critical. The part is now considered obsolete, but its specifications and use cases are well documented.