The XC6SLX16-2CSG324C is a Spartan-6 LX FPGA for programmable logic and parallel datapaths. This guide focuses on identifying the exact ordering code, reading its electrical limits, and preparing a useful purchasing specification. A matching family name alone is insufficient to approve a replacement for an existing board.
Technical review: October 14, 2026.
Ordering code and core specifications
In XC6SLX16-2CSG324C, XC6SLX16 identifies the device, -2 selects its timing grade, CSG324 identifies a lead-free 324-ball package, and the final C denotes commercial junction-temperature operation. Speed grade and temperature grade are separate selections.
| Item | XC6SLX16-2CSG324C |
|---|---|
| Logic resources | 14,579 logic cells; 2,278 slices |
| Block RAM | 576 Kb across 32 blocks of 18 Kb |
| DSP resources | 32 DSP48A1 slices |
| Clock management | Two CMTs; each contains two DCMs and one PLL |
| Package user I/O maximum | 232 |
| Package geometry | 15 × 15 mm body; 0.8 mm ball pitch |
| GTP transceivers / hard PCIe endpoint | None in this LX device |
| Commercial junction-temperature range | 0°C to +85°C |
Resource and package values come from AMD DS160, Tables 1–3 (October 25, 2011). Logic-cell ratings are not a count of physical LUTs; project utilization reports provide a more useful basis for fit decisions.
Pinout and PCB checks before ordering
Use the exact XC6SLX16/CSG324 pinout and package drawing from AMD UG385, Spartan-6 Packaging and Pinouts when checking a schematic symbol or PCB footprint. The 324 balls include supplies, grounds and dedicated functions, so they cannot all be allocated to external signals.
Review each assigned signal against its bank, voltage, clock capability and any shared configuration function. A useful design handoff includes the schematic revision, FPGA constraints file, bank-voltage map and configuration circuit. Check package orientation and ball coordinates independently of the library name. A photograph of another BGA package is not a pinout reference.
Before releasing a replacement purchase order, compare the approved BOM against the full suffix on the proposed part. A matching ball count does not establish the same body size, pitch, pin functions or device identity. Ask the assembler to confirm its footprint, escape routing and assembly process against the manufacturer drawing rather than assuming a standard layer count will suit every board.
Power, temperature and speed limits
AMD DS162, v3.1.1 (January 30, 2015), Table 2 specifies 1.14–1.26 V for standard-performance -2 VCCINT operation, with 1.2 V nominal. It also defines an extended-performance supply range and memory-interface conditions; evaluate those separately if using an MCB.
VCCAUX can use nominal 2.5 V or 3.3 V, subject to the documented conditions. One explicit configuration constraint is that VCCO_2 at 1.8 V requires VCCAUX at 2.5 V. Select each bank's VCCO and I/O standard together. Do not treat a supply's absolute maximum rating as a normal operating target or use this device as a direct 5 V logic receiver.
The commercial limit is junction temperature, not ambient temperature. For illustration only, an assumed 60°C ambient and 20°C junction rise gives an estimated junction temperature of 80°C, leaving 5°C below the commercial upper limit. That arithmetic is not a package thermal characterization or a measured result; actual rise must be established for the board, workload and airflow.
The -2 code is not a universal operating frequency. Use the selected device's timing model and post-route timing report to validate the actual clocks, I/O delays and exceptions. A higher speed grade does not remove clock-domain-crossing or board signal-integrity problems.
Configuration and development planning
The configuration is volatile. Plan for a suitable boot source or host-driven load after power-up and retain JTAG access for controlled diagnosis. AMD UG380, v2.11 (March 22, 2019) documents configuration modes, pin connections and startup behavior.
For a SPI-boot design, verify flash compatibility, supply levels, mode selection and clocking before choosing a memory part. Size the memory for the generated configuration image and any recovery images, rather than treating the FPGA's block-RAM capacity as its bitstream size. Follow the documented power-up and configuration requirements instead of relying on a generic three-rail sequencing rule.
AMD WP368 identifies ISE Design Suite 14.7 as a production tool suite for Spartan-6. Preserve the tool installation, project settings, constraints, IP versions and known-good programming files with the manufacturing release. Confirm that another engineer can reproduce the intended build before approving a maintenance redesign.
Applications and replacement decisions
Candidate uses include custom interface logic, buffered acquisition and arithmetic pipelines. Decide suitability from an implementation budget: required interfaces, logic utilization, allocated memory, arithmetic precision and achievable timing. A list of possible applications does not establish that a particular motor controller, imaging system or other regulated product meets its system requirements.
For an illustrative DSP budget, assume a datapath needs 24 independent signed multiplications, with operands no wider than 18 bits, and implementation assigns one DSP48A1 to each multiplication without time sharing. This reserves 24 of the LX16's 32 DSP slices, leaving eight for other functions. The LX9 has 16 DSP slices, so that same allocation would exceed its DSP count by eight; a revised schedule or fabric implementation would need a separate timing and resource review. Both devices have 576 Kb of block RAM, so this particular density increase does not add block-RAM capacity. The counts are from DS160 Table 1; the allocation is an engineering example, not a measured throughput claim or a prediction that the complete design will fit.
For replacement review, start with the existing design's constraints rather than a list of supposedly equivalent parts. Changes to density, package, speed grade or temperature grade require engineering approval. Compare pin assignments, available resources, bank voltages, configuration images and timing reports; do not release a substitute merely because its ordering code looks similar. A move to another FPGA family also requires a toolchain and IP review.
Lifecycle, pricing and RFQ information
AMD's June 1, 2023 lifecycle announcement extends Spartan-6 support through at least 2030, including all speed and temperature grades. This family-level statement is not confirmation of a specific supplier's inventory, current quotation or shipment date.
For a useful quotation, provide XC6SLX16-2CSG324C in full, required quantity, delivery destination and required date. State any date-code, packaging, traceability-document or inspection requirements explicitly. Request written confirmation of unit price, currency, available quantity, packaging condition, dispatch basis and applicable commercial terms. Compare offers on the same requirements; a low headline price does not describe the complete procurement scope.
You can search the WWDParts catalog for XC6SLX16-2CSG324C. Catalog results are a starting point for an inquiry; confirm the exact part and offer details before ordering.
Frequently asked questions
Does the C suffix mean an ambient limit of 85°C?
No. It identifies the commercial junction-temperature grade. An enclosure's ambient temperature and the powered device's junction temperature are different quantities.
Can a faster speed grade be approved automatically?
No. Have the design owner review the proposed ordering code, applicable timing model and released implementation. Record the accepted substitution in the BOM or approved alternatives list.
Does the published lifecycle statement establish current availability?
No. Obtain a dated quotation for the exact ordering code and required quantity, with the supplier's delivery basis stated in writing.