AT17C256-10SI

Overview

The AT17C256-10SI is a 256K-bit (262,144 x 1-bit) serial EEPROM designed for FPGA configuration. It operates at 5V nominal with an industrial temperature range of -40°C to +85°C. The device supports a maximum clock frequency of 12.5 MHz in standalone mode and 10 MHz when cascading. It is housed in a 20-lead Plastic J-leaded Chip Carrier (PLCC) package.

Feature Summary

• Supports in-system programming via a 2-wire serial bus
• Features programmable reset polarity for flexible interface control
• Enables cascading read-back capabilities for expanded memory configurations
• Compatible with Master Serial Mode for automatic FPGA loading

Applications

• Configuration memory for Field Programmable Gate Arrays (FPGAs)
• In-system programming of FPGA configuration data
• Cascaded memory systems for high-density array configurations

Procurement Notes

Verify the specific ordering suffix corresponds to the required package type and operating temperature range. Confirm that the 5V supply voltage aligns with the system design requirements. Ensure compatibility with standard industry programmers or dedicated programming kits for initial configuration.

Selection Notes

Select this component for applications requiring non-volatile storage of FPGA bitstreams. Consider the PLCC package availability and pinout compatibility within the product family. Evaluate the need for cascading support if the target FPGA requires more than 256K bits of configuration data.

Part Context

This part belongs to the low-density AT17 Series of FPGA Configuration EEPROMs. The series includes variants with 64K, 128K, and 256K capacities. The 'C' designation indicates 5V operation, while 'LV' denotes 3.3V versions. The 'SI' suffix specifies the Industrial temperature grade and 20-lead PLCC package.

Replacement Considerations

AT17LV256-10SI

FAQ

How does the device handle external resets during configuration?

The RESET/OE input can be driven by the FPGA reset pin to clear the internal address pointer, ensuring reconfiguration starts from the beginning.

What is the function of the CEO output pin?

The CEO output asserts Low after the last bit is read, enabling the connection of subsequent EEPROMs in a cascade chain.