XCR3256XL-12PQ208C

Overview

The XCR3256XL-12PQ208C is an Electrically Erasable Programmable Logic Device (EEPROM-based PLD) belonging to the CoolRunner-XPLA3 family. Manufactured by AMD, this component features 256 macrocells and approximately 6,000 usable gates. It operates with a maximum clock frequency of 88 MHz and offers a typical propagation delay of 12 ns. The device supports system-in-programmability and includes JTAG boundary scan capabilities for testing. It is housed in a 208-pin Plastic Quad Flat Package (PQFP) and functions within a supply voltage range of 3V to 3.6V.

Feature Summary

• Contains 256 macrocells and 6,000 usable gates for complex logic implementation.
• Supports System-In-Programmability (SIP) allowing reprogramming without removal from the circuit board.
• Includes JTAG boundary scan support compliant with IEEE 1149.1 standards.
• Operates on a single 3V to 3.6V power supply with low power consumption characteristics.

Applications

• Logic replacement for legacy TTL and CMOS circuits.
• Address decoding and chip select generation in embedded systems.
• State machine implementation for industrial control interfaces.
• Bus protocol conversion between different communication standards.

Procurement Notes

Verify RoHS compliance status as older revisions may not meet current environmental directives. Confirm package integrity for the PQFP-208 form factor upon receipt. Check manufacturing date codes against long-term availability requirements, as this part may be subject to end-of-life notices. Ensure static-sensitive handling procedures are followed during installation.

Selection Notes

Select this model when 256 macrocells are sufficient for the design complexity. The 12 ns speed grade suits applications requiring moderate switching speeds up to 88 MHz. Choose the PQFP-208 package if through-hole or standard surface-mount assembly with larger pitch is preferred over BGA options. Verify voltage compatibility with the 3V to 3.6V operating range before integration.

Part Context

This component is part of the CoolRunner-XPLA3 series, which utilizes EEPROM technology for non-volatile configuration storage. Unlike Flash-based CPLDs, EEPROM devices allow for unlimited reprogramming cycles without the need for UV erasure. The XCR3256XL variant represents a high-density option within this specific lineage, bridging the gap between simple PALs and larger FPGA architectures.

Replacement Considerations

Direct pin-to-pin replacements may be limited due to the specific EEPROM architecture. Consider equivalent density CPLDs from other manufacturers such as Lattice Semiconductor's MachXO or ICE40 families, ensuring voltage levels and I/O drive strengths match the original design specifications.