The AM27X256-120PC is a 256K-bit (32K x 8) EPROM (Erasable Programmable Read-Only Memory) manufactured by Advanced Micro Devices (AMD). The '120' indicates a 120ns access time. The 'X' suggests that this is possibly a faster or enhanced version compared to a standard AM27C256.

Applications

• Firmware storage in embedded systems
• Boot code storage
• Program storage for microcontrollers and microprocessors
• Lookup tables
• Character generators

Features

• 256K-bit (32K x 8) organization
• Access time: 120 ns
• Single 5V power supply
• Electrically programmable
• UV erasable
• Three-state outputs
• TTL Compatible Inputs/Outputs

Benefits

• Non-volatile storage of program code and data
• Fast access time for quick data retrieval
• Easy to program and erase for development purposes
• Suitable for a range of embedded applications
• TTL compatibility simplifies system integration

Additional Details

The AM27X256-120PC is programmed by applying appropriate voltages to designated pins. The stored data can be erased by exposure to UV light via the quartz window on top of the package. It typically comes in a 28-pin plastic DIP or ceramic package with the quartz window for erasure.

The three-state outputs enable the device to be easily interfaced with microprocessor systems, allowing multiple memory devices to share the system's data bus. The 5V supply simplifies power requirements. The 120ns access time provides reasonable speed for many embedded control applications where code is executed directly from the EPROM.

Because it is an older part, the AM27X256-120PC will likely be encountered in legacy equipment and older designs. Care should be taken during handling and programming to avoid damage from electrostatic discharge.