The AM27C64-90JC is a 64K (65,536 bits) UV Erasable Programmable Read-Only Memory (EPROM) manufactured by Advanced Micro Devices (AMD). This EPROM is designed for applications requiring non-volatile storage of data or programs.

Applications

• Embedded systems: Used to store firmware and boot code in embedded systems.
• Industrial control equipment: Stores control programs and calibration data.
• Instrumentation: Stores instrument settings and calibration parameters.
• Microcontroller-based systems: Provides non-volatile program storage for microcontrollers.
• Programmable logic controllers (PLCs): Used to store PLC programs.

Features

• 64K (8K x 8) Memory Organization: Provides 65,536 bits of storage, organized as 8,192 bytes.
• UV Erasable: Can be erased using ultraviolet light, allowing for reprogramming.
• Single +5V Power Supply: Operates on a single 5-volt power supply.
• Fast Access Time: 90ns access time for quick data retrieval.
• TTL Compatible Inputs/Outputs: Interfaces easily with TTL logic circuits.

Benefits

• Non-Volatile Storage: Retains data even when power is removed.
• Reprogrammable: Can be erased and reprogrammed multiple times.
• Easy to Use: Simple interface and programming requirements.
• Fast Data Access: Provides quick access to stored data.
• Wide Operating Temperature Range: Suitable for use in various environments.

Additional Details

The AM27C64-90JC is typically packaged in a ceramic DIP (Dual In-Line Package) with a quartz window to allow for UV erasure. The programming process involves applying specific voltages to the device's pins to store data in the memory cells. The device operates by reading data from memory locations based on address inputs. The 90ns access time refers to the maximum time required for the data to become available after the address is applied. This EPROM is suitable for applications where occasional reprogramming is required. Further research needed to determine write cycles, but EPROMs have a limited number of write cycles. JEDEC standard pinout.