Reviewed October 14, 2026. XC6SLX9-2TQG144I identifies an industrial-temperature Spartan-6 LX FPGA in a leaded 144-pin package. For a purchase or board revision, the important distinction is between the LX9 silicon resources and the features actually available in TQG144. A family-level specification alone is not enough to approve this part.
Decode the complete ordering number
XC6SLX9 identifies the Spartan-6 LX9 device; -2 is its speed grade; TQG144 identifies the 144-pin thin quad flat package with a Pb-free package code; and I specifies the industrial junction-temperature range. Keep every element of this number on the BOM and purchase request. A matching family name does not establish a matching package or temperature grade. See AMD DS160, ordering information and UG385, package marking.
Device resources and package limits
| Item | Specification |
|---|---|
| Logic cells | 9,152 |
| Slices | 1,430; four 6-input LUTs and eight flip-flops per slice |
| Block RAM | 576 Kb in 32 blocks of 18 Kb |
| DSP48A1 slices | 16 |
| Clock management tiles | Two; each has two DCMs and one PLL |
| Maximum user I/O in TQG144 | 102 |
| Hard memory controller in TQG144 | Not available |
| GTP transceivers / hard PCI Express endpoint | Not present in LX9 |
These values come from DS160, Tables 1 and 2 and their notes. The LUT architecture is six-input, not four-input. The 200-I/O figure sometimes associated with LX9 refers to other packaging, not this ordering number. Do not carry the family's memory-controller or transceiver specifications into a TQG144 design.
Package and pinout checks before a PCB release
The package body is 20 × 20 mm, the lead span is 22 × 22 mm, and lead pitch is 0.5 mm. Use the UG385 TQG144 mechanical drawing and LX4/LX9 pinout to create or verify the footprint. A body dimension is not a land-pattern dimension. Do not add a thermal-pad connection based on a generic QFP library symbol or an unrelated component photograph.
Build a pin-assignment checklist with separate entries for power, ground, configuration, clock-capable pins and application signals. For each application signal, record its bank, I/O standard, external voltage and direction. Reserve configuration and clock functions before counting the remaining pins as usable interfaces. The published maximum I/O count is a package resource limit, not a promise that every proposed signal combination is legal.
Before approving a replacement footprint or density change, compare individual pin functions and bank assignments. The official package matrix lists TQG144 for LX4 and LX9, not LX16. An alleged XC6SLX16-2TQG144I should therefore not be accepted as a documented upgrade option. Even a real same-package candidate needs a resource, bitstream, timing and board review.
Power and temperature: use operating conditions
For the -2 device at standard performance, VCCINT is nominally 1.2 V, with a recommended range of 1.14–1.26 V. DS162 lists VCCAUX options of 2.5 V and 3.3 V, subject to its notes; during configuration, a 1.8 V VCCO_2 requires VCCAUX to be 2.5 V. TQG144 does not support the extended-performance mode. Industrial operation is specified over −40°C to +100°C junction temperature, not ambient temperature. See DS162 Table 2.
Select each bank supply and signal standard together. Merely connecting a bank to 3.3 V does not validate every input threshold, output load or power-up interaction. Check the applicable DC specifications and the connected device's limits. Do not connect a 5 V output directly on the assumption that this FPGA is 5 V tolerant.
Size regulators and decoupling for the implemented design, board routing and switching activity. A generic instruction to fit one capacitor per pin does not establish power integrity. Review rail ramp behavior and configuration conditions against DS162; then verify the assembled board under its intended loads and temperatures. The industrial suffix alone is not evidence of automotive qualification or system-level environmental certification.
Configuration and development environment
Configuration is volatile. A board must reload the design after power-up, using a supported configuration source. Master SPI flash and a host-driven configuration path are different system choices; an external SPI flash is not mandatory for every board. Use UG380, Spartan-6 FPGA Configuration User Guide, to verify the selected mode, pin functions, voltage requirements and flash protocol before selecting memory.
Spartan-6 development uses the ISE tool flow. AMD's ISE Design Suite 14.7 release notes document device and environment support. For an existing product, retain the source project, constraints, IP versions, tool version and programming procedure together. Rebuilding a bitstream successfully is only one step: review timing reports and verify the board behavior before releasing a revised image.
Application fit: decide from a resource budget
Potential uses include parallel interface control, protocol bridging, counters and modest digital signal-processing pipelines. Treat these as engineering options, not proven performance claims. Start with the actual channel count, data width, clock rate, buffer depth and external interface requirements. Then synthesize and place-and-route the proposed design to determine whether it fits and meets timing.
For example, several sensor interfaces may need separate clock-domain crossings, error handling and buffer-overflow behavior. Counting only interface state machines understates the design. A camera interface also needs a bandwidth and storage budget; the presence of block RAM does not establish support for a particular video resolution or frame rate. Motor-control logic still needs independent decisions about fault handling and system safety.
Example: estimate a sensor FIFO before allocating RAM
Assume four channels each produce 100,000 samples/s, each sample is stored as one 16-bit word, and the host may pause reads for 5 ms. The arriving data is 4 × 100,000 × 0.005 = 2,000 words, or 4,000 bytes. UG383, block RAM aspect ratios, lists a 1,024 × 16 configuration per 18 Kb block when parity storage is unused. Two blocks therefore provide 2,048 words, leaving only 48 words of headroom in this simplified budget. The 18 Kb label includes parity storage; it is not 18 Kb of payload in this 16-bit configuration.
This is a capacity calculation, not a measured throughput result. Increase the allocation for timestamps, burst variation, reserved FIFO entries and implementation overhead. Check the generated FIFO's actual depth, and ensure the host can drain data faster than the sustained arrival rate once it resumes.
Procurement, lifecycle and quotation checklist
AMD's Spartan-6 family page states support is extended until at least 2030. That family-level statement is not a stock report, a lead-time commitment or confirmation of an individual offered lot. Confirm the complete ordering code and current manufacturer notices when making a sourcing decision.
- Specify XC6SLX9-2TQG144I, quantity, delivery destination and required delivery date.
- Ask for the offered condition, date/lot information, packaging and traceability documents required by your purchasing process.
- Require any proposed substitute to be listed separately and approved by engineering before shipment.
- Compare quotations using the same quantity, delivery terms and documentation requirements; a datasheet does not determine price.
You can search the WWDParts catalog for XC6SLX9-2TQG144I. Confirm availability and commercial terms for the actual request.
Frequently asked questions
Does -2 specify one maximum clock frequency?
No. It selects timing specifications for the speed grade. The achievable design clock depends on the logic, routing, constraints and operating conditions. Use the relevant DS162 limits and implementation timing report.
Can a larger FPGA reuse the same bitstream?
Do not assume it can. A device change requires review of the implementation target, resources, pin mapping and configuration image. Obtain engineering approval for the exact proposed replacement.
Does the I suffix mean the board can operate at 100°C ambient?
No. It describes the specified junction-temperature range. The board's ambient limit must account for dissipation and the thermal path in the actual enclosure.
Which documents should accompany a design review?
Use DS160 v2.0 (October 25, 2011) for device and package selection, DS162 v3.1.1 (January 30, 2015) for electrical and timing limits, UG385 v2.4 (November 13, 2019) for pinout and mechanical details, and UG380 v2.11 (March 22, 2019) for configuration. These document revision dates are not the release date of this exact ordering code or the manufacture date of a supplied device.