The M27C256H-55 is a 256 Kbit (32Kb x 8) UV erasable PROM (EPROM) manufactured by OKI/Metcal. This memory device is commonly used in embedded systems and other applications requiring non-volatile storage that can be reprogrammed. The "-55" suffix indicates a speed grade, representing the access time in nanoseconds.

Applications

• Embedded systems: Storing firmware, bootloaders, and configuration data.
• Industrial control systems: Storing control algorithms and parameters.
• Telecommunications equipment: Storing configuration data for network devices.
• Instrumentation: Storing calibration data for measurement instruments.
• Legacy computer systems: Replacing older ROMs and EPROMs.

Features

• 256 Kbit (32Kb x 8) memory capacity: Stores a significant amount of data.
• UV erasable: Can be erased and reprogrammed using ultraviolet light.
• Fast access time: 55ns access time for quick data retrieval.
• Single 5V power supply: Operates with a single 5V power supply.
• TTL compatible inputs and outputs: Compatible with standard TTL logic circuits.
• Three-state output: Allows for easy memory expansion.

Benefits

• Reprogrammability: Allows for firmware updates and modifications.
• Non-volatile storage: Retains data even when power is removed.
• Fast access time: Enables quick data retrieval for real-time applications.
• Easy integration: Compatible with standard logic circuits and power supplies.
• Wide temperature range: Suitable for use in a variety of environments.

Additional Details

The M27C256H-55 requires a UV eraser to erase the stored data. The programming voltage and timing parameters must be carefully controlled to ensure proper programming. Proper handling is crucial to prevent electrostatic discharge (ESD) damage. Consult the datasheet for specific programming and erasure instructions, as well as operating conditions.