AT17C256A-10JC

Overview

The AT17C256A-10JC is a 256-kilobit serial EEPROM designed as a configurator for Altera FLEX devices. It operates at a nominal 5V supply voltage and supports in-system programming via a 2-wire bus. The device features a simple serial interface to SRAM FPGAs, allowing direct configuration without an external intelligent controller. It includes programmable reset polarity and write protection mechanisms. The component is housed in a 20-lead PLCC package and supports cascading with other devices in the series.

Feature Summary

• Stores configuration programs for Field Programmable Gate Arrays (FPGAs) using a low-power CMOS EEPROM process.
• Enables in-system programming through a 2-wire serial bus interface.
• Supports cascading read-back capabilities to configure multiple or higher-density FPGA arrays.
• Allows user-programmable reset polarity and internal write-protection during programming mode.

Applications

• Configuring Altera FLEX devices
• Providing configuration memory for SRAM-based FPGAs
• Storing configuration data for field programmable gate arrays

Procurement Notes

Verify that the specific ordering code matches the required voltage level and temperature range. Confirm the package type corresponds to the design requirements. Ensure compatibility with existing Altera FPGA interfaces before procurement. Check for any superseded versions within the AT17A series family.

Selection Notes

Select this part when configuring Altera FLEX devices requiring 256-kilobit capacity. Choose the 'C' suffix version for 5V nominal operation. Consider the 'LV' variant if a 3.3V supply is necessary. Verify that the 20-lead PLCC package fits the PCB layout constraints.

Part Context

This component belongs to the AT17A Series of FPGA Configuration EEPROMs. The series includes 64K, 128K, and 256K bit densities. These devices are specifically engineered to store configuration programs for Altera FLEX devices. They provide a cost-effective solution for FPGA initialization.

Replacement Considerations

The datasheet notes that 256-Kbit density parts can replace Altera EPC1213. Verify pinout and electrical compatibility before substituting.