A54SX16A-FGG256I

Overview

The A54SX16A-FGG256I is an industrial-grade Field Programmable Gate Array from the Actel SX-A family, featuring 24,000 system gates and 180 user-programmable I/O pins. It operates within a voltage range of 2.25 V to 2.75 V at a nominal 2.5 V, supporting a maximum system frequency of 250 MHz with internal performance up to 350 MHz. The device utilizes 0.22 μm / 0.25 μm CMOS antifuse technology and is housed in a 256-pin Fine Pitch Ball Grid Array (FBGA) package. It supports mixed-voltage operation for 2.5 V, 3.3 V, and 5 V I/Os with 5 V input tolerance.

Feature Summary

• Nonvolatile single-chip solution utilizing metal-to-metal programmable antifuse interconnect elements for permanent low-impedance connections.
• Hot-swap compliant I/Os allowing safe insertion into active systems without power sequencing requirements or system degradation.
• Configurable weak-resistor pull-up or pull-down capabilities for individual I/O pins to ensure deterministic states during power-up.
• Support for IEEE Standard 1149.1 (JTAG) boundary-scan testing with dedicated and flexible modes for diagnostic verification.

Applications

• Industrial control systems requiring deterministic timing and high reliability
• Mixed-voltage interface designs supporting 3.3 V / 5 V PCI and 5 V TTL standards
• Secure embedded applications protected by FuseLock anti-tamper technology

Procurement Notes

Verify component authenticity through authorized Microchip distributors. Confirm that the ordering suffix matches the required temperature grade and package specifications. Check for RoHS compliance status if environmental regulations apply to the target assembly process.

Selection Notes

Select this part for designs needing 24,000 system gates with industrial temperature stability. Ensure the FBGA256 footprint aligns with PCB layout constraints. Verify that the 2.5 V core voltage and mixed I/O capabilities meet the specific signal interface requirements of the application.

Part Context

This component belongs to the Actel SX-A FPGA family, which provides cost-effective, low-power solutions using antifuse technology. The SX-A series is designed to replace multiple CPLDs or gate arrays, offering high performance and security features suitable for demanding embedded logic applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult official Microchip resources for current availability and potential obsolescence notices regarding the SX-A family.

FAQ

How does the SX-A architecture handle routing delays?

The architecture uses DirectConnect for zero-antifuse paths under 0.1 ns and FastConnect for single-antifuse paths under 0.3 ns, ensuring predictable and fast signal propagation within clusters.

What is the behavior of I/Os during power-up?

All I/Os are tristated during power-up/down unless configured otherwise. Configurable weak resistors can set them to a known state, and VCCA/VCCI can be powered in any order.

Can JTAG pins be used as general-purpose I/Os?

Yes, in Flexible mode, TDI, TCK, and TDO can function as user I/Os. TMS cannot be used as a user I/O in either Dedicated or Flexible modes.