AT17C256-10JI

Overview

The AT17C256-10JI is a 256K-bit (262,144 x 1-bit) serial EEPROM configurator designed for FPGA configuration. It operates at a nominal 5V supply voltage and supports an industrial temperature range of -40°C to +85°C. The device features a simple serial interface compatible with FPGA Master Serial Mode, allowing automatic loading of configuration programs upon power-up. It includes programmable reset polarity, write protection mechanisms, and cascading capabilities for expanded memory configurations.

Feature Summary

• Provides non-volatile storage for FPGA configuration data via a simple serial access procedure.
• Supports in-system programming through a 2-wire serial bus interface.
• Features programmable reset polarity and internal write-protection mechanisms.
• Enables cascading of multiple devices to support larger or future FPGA arrays.

Applications

• Configuration of Field Programmable Gate Arrays (FPGAs)
• In-System Programming (ISP) of FPGA configuration memories
• Storage of configuration programs for SRAM-based FPGAs

Procurement Notes

Verify the specific suffix 'JI' corresponds to the Industrial temperature range (-40°C to +85°C) and 20-lead PLCC package as defined in the ordering information. Confirm that the 5V operation aligns with system requirements, distinguishing it from the LV (3.3V) variants. Ensure compatibility with existing FPGA master serial mode interfaces before procurement.

Selection Notes

Select this component when a 256K-bit capacity is required for FPGA configuration in industrial environments. The 20-lead PLCC package offers space efficiency compared to PDIP options. Consider cascading if additional memory density is needed, noting that the AT17C65 cannot be used in cascade chains. Verify that the host FPGA supports the serial configuration protocol described in the datasheet.

Part Context

The AT17C256 belongs to the low-density AT17 Series of FPGA Configuration EEPROMs, manufactured originally by Atmel and now under Microchip Technology. This series is designed to provide cost-effective configuration memory solutions for various FPGA families, including Xilinx, Altera, and Atmel devices. The part number indicates the 256K bit density, 5V operation, industrial grade, and PLCC packaging.

Replacement Considerations

The AT17LV256-10JI serves as a direct functional substitute within the same family but operates at 3.3V instead of 5V. Other members of the AT17C/LV65/128/256 series may replace this part if memory density requirements differ, provided pin compatibility and voltage levels are addressed.