The AM27C256-250DC is a 256K (32K x 8) CMOS EPROM (Erasable Programmable Read-Only Memory) manufactured by various companies, including potentially AMD originally, and now supplied by Rochester Electronics. The '250' indicates an access time of 250ns, and 'DC' usually signifies a DIP (Dual In-line Package) ceramic or plastic package.

Applications

• Firmware storage in embedded systems
• Program storage in microcontrollers
• Boot loaders
• Data storage in electronic devices
• Configuration memory for programmable logic devices (PLDs)

Features

• 256K (32K x 8) memory organization
• CMOS technology for low power consumption
• 250ns access time
• Single 5V power supply
• TTL compatible inputs and outputs
• Programmable using standard EPROM programmers
• Erasable with ultraviolet (UV) light

Benefits

• Non-volatile storage: Data is retained even when power is removed.
• Low power consumption: Suitable for battery-powered devices.
• Fast access time: Enables quick retrieval of stored data.
• Easy to program: Can be programmed using readily available EPROM programmers.
• Erasable and reprogrammable: Allows for firmware updates and modifications.
• High reliability: Proven technology for reliable data storage.

Additional Details

The AM27C256-250DC is typically housed in a 28-pin DIP package. It requires a single 5V power supply for operation. The memory array is organized as 32,768 bytes (32K x 8). The access time of 250ns determines how quickly data can be read from the memory after the address lines are stable. The EPROM is erased by exposing it to ultraviolet (UV) light through a quartz window on the package. After erasure, the EPROM can be reprogrammed with new data using an EPROM programmer. It's crucial to follow the manufacturer's programming guidelines to ensure proper programming and data retention. Rochester Electronics often re-manufactures or continues to supply devices that are no longer actively produced by the original manufacturer, ensuring availability for legacy systems and applications. Always refer to the Rochester Electronics datasheet for specific characteristics.