A54SX08-PLG84I - 8K Gate SX FPGA 69 I/O PLCC-84 | Microchip
MPN: A54SX08-PLG84I β Active| Qty | Unit Price | Extended |
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Drop-in alternatives for A54SX08-PLG84I β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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A54SX08-P1PLG84I
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A54SX08-P2PLG84I
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A54SX08-PLG84
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A54SX08-1PL84I
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A54SX08-PLG84I Maximum Ratings & Electrical Characteristics
| Family | Actel SX (54SX) |
| Equivalent Gates | 8000 |
| Logic Cells (Modules) | 512 |
| Configurable Logic Blocks (CLBs) | 768 |
| Number of User I/O | 69 |
| Maximum Toggle Frequency | 240 MHz |
| Process Technology | 0.35 um CMOS |
| Supply Voltage (VCCI) | 3 V to 3.6 V |
| Supply Voltage (VCI) | 4.75 V to 5.25 V |
| I/O Standard Compatibility | 3.3 V / 5 V |
| Programming Technology | Antifuse (one-time programmable) |
| Package / Case | 84-LCC (J-Lead), PLCC-84 |
| Supplier Device Package | 84-PLCC (29.31 x 29.31 mm) |
| Terminal Pitch | 1.27 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (industrial, -I suffix) |
| RoHS Status | Lead free / RoHS Compliant |
A54SX08-PLG84I 84-plcc (29.31 x 29.31 mm) Pin Configuration Guide
Complete pinout information for A54SX08-PLG84I (84-plcc (29.31 x 29.31 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for A54SX08-PLG84I.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
A54SX08-PLG84I is suitable for 6 applications: Legacy Industrial Control and Automation, Telecom Line-Card Glue Logic, Motion Control Sequencing, Test and Measurement Backplanes, Obsolescence Management and Design Re-Sourcing, Aerospace-Heritage and High-Reliability Ground Systems.
Legacy Industrial Control and Automation
The A54SX08-PLG84I fits industrial control boards that were designed around 5 V backplane logic and PLCC sockets: its dual 3.0-3.6 V / 4.75-5.25 V supply scheme and 3.3 V/5 V I/O compatibility let it interface directly with legacy 5 V PLC I/O, optocouplers, and bus transceivers without level shifting. In these systems the 8000-gate fabric implements sequencers, interlock logic, PWM generators, and encoder-decoder state machines, with the 240 MHz toggle ceiling far exceeding the sub-50 MHz clock rates typical of industrial sequencing. Because the antifuse configuration is permanent, a control program cannot be corrupted by power interruptions or EMI-induced configuration upset - a real failure mode for SRAM FPGAs on noisy factory floors. The PLCC-84 J-lead package is also field-solderable and socketable, easing repair on long-service machinery.
Recommended
Telecom Line-Card Glue Logic
Telecom line cards of the late-1990s and 2000s generation frequently used Actel SX devices for bus-interface glue logic, and the A54SX08-PLG84I reproduces that role in maintenance and spares programs. Its 69 user I/O accommodate T1/E1 framing interfaces, backplane address/data latching, and interrupt aggregation, while the 0.8 ns-class CLB combinatorial delay on faster grades keeps decode and wait-state logic out of the critical path. The dual-rail supply matches cards that mix 5 V legacy PHYs with 3.3 V processors. Designers re-sourcing these cards benefit from the permanent antifuse configuration, which eliminates boot PROMs and their associated fit failures in high-availability racks. When timing margins are tight at higher line rates, the pin-compatible A54SX08-P2PLG84I (320 MHz) can be substituted without layout change.
Recommended
Motion Control Sequencing
In motor-drive and motion-control boards, the A54SX08-PLG84I implements quadrature-decoder counters, PWM pattern generators, axis-interlock logic, and step/direction distribution. The 240 MHz toggle rate allows PWM carrier frequencies well above audible range even with modest counter widths, and the deterministic antifuse fabric gives fixed, jitter-free propagation once programmed - valuable for synchronized multi-axis triggering. Industrial-grade operation from -40 C to +85 C covers cabinet-mounted drives in unconditioned environments. The 69 I/O are enough for several axes of encoder, limit-switch, and amplifier-enable signals in one package, replacing a handful of 74-series devices and reducing board area in the 29.31 x 29.31 mm PLCC footprint. Timing verification should use the Microchip timing model for the specific speed grade chosen.
Recommended
Test and Measurement Backplanes
Bench and rack instrumentation often needs a modest, fixed-configuration logic device for trigger arbitration, time-stamping, and bus protocol handling - a role the A54SX08-PLG84I serves with its 8000 gates and 69 I/O. Deterministic post-programming delays simplify measurement-chain timing budgets because the fabric introduces no configuration-dependent variation between units, unlike SRAM FPGAs whose bitstream versions can shift timing. The 5 V-compatible I/O range connects directly to instrument backplanes built on 5 V TTL and ABX-style bus standards common in legacy ATE. With the PLCC-84 package, service departments can stock programmed spare devices and replace them with hand tools in the field, keeping instruments in service without board-level rework or firmware re-flashing equipment.
Recommended
Obsolescence Management and Design Re-Sourcing
A primary ongoing use of the A54SX08-PLG84I is obsolescence management: programs maintaining platforms designed around Actel SX silicon can re-buy the same die in the same PLCC-84 footprint rather than respinning boards. Microchip, after acquiring Actel and Microsemi, continues to supply the 54SX family, and the -P1 and -P2 speed grades offer a performance cushion if the original speed grade becomes scarce. Procurement teams should qualify at least one same-package alternate (for example A54SX08-P1PLG84I) as a second source of the identical silicon, and should archive the antifuse fusemap and design sources with the bill of materials. Because the fabric is one-time programmable, any design change requires new physical parts, so lifecycle documentation is part of the maintenance plan.
Recommended
Aerospace-Heritage and High-Reliability Ground Systems
The Actel antifuse architecture was historically favored in aerospace-heritage and high-reliability ground equipment because one-time-programmable configuration is immune to the configuration-upset mechanisms that affect SRAM FPGAs under radiation-rich or high-vibration conditions. While the commercial A54SX08-PLG84I is not a space-qualified part, ground-station support gear, launch-site instrumentation, and heritage defense test sets built on the SX family can maintain configuration control by continuing to use the same programmed device type. The permanent fusemap also simplifies configuration management audits: a given device serial number maps to one immutable design revision. For new high-reliability designs Microchip's RTAX radiation-tolerant family is the appropriate successor, but for sustaining existing platforms the SX08 remains a supported sourcing path.
Recommended
Recommended Products Summary
Engineering reference data for A54SX08-PLG84I β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | A54SX08-P1PLG84I | A54SX08-P2PLG84I | A54SX08-PLG84 | A54SX08-1PLG84I | A54SX08-1PL84I |
|---|---|---|---|---|---|---|
| Package | 84-PLCC (J-Lead), 29.31 x 29.31 mm | 84-PLCC - same | 84-PLCC - same | 84-PLCC - same | 84-PLCC - same | 84-PLCC - same |
| Brand | Microchip Technology (Microsemi/Actel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Equivalent Gates | 8000 | 8000 | 8000 | 8000 | 8000 | 8000 |
| CLBs | 768 | 768 | 768 | 768 | 768 | 768 |
| User I/O | 69 | 69 | 69 | 69 | 69 | 69 |
| Max Clock / Toggle Frequency | 240 MHz | 280 MHz | 320 MHz | 240 MHz | [DATA_NEEDED] | [DATA_NEEDED] |
| Supply Voltage | 3.0-3.6 V and 4.75-5.25 V | 3.0-3.6 V and 4.75-5.25 V | 3.0-3.6 V (3.3 V nominal) | 3.0-3.6 V and 4.75-5.25 V | 3.0-3.6 V and 4.75-5.25 V | 3.0-3.6 V and 4.75-5.25 V |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | [DATA_NEEDED] | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
| RoHS | Compliant | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Standard speed grade offers lowest-cost path at 240 MHz (vs A54SX08-P2PLG84I)
- Industrial temperature rating (vs A54SX08-PLG84)
- One-time-programmable antifuse security (vs Modern SRAM FPGAs (e.g. A3PE600-2FGG484))
Design Notes
The A54SX08-PLG84I requires dual supply rails: VCCI at 3.0-3.6 V and VCI at 4.75-5.25 V per the Microsemi specification data. Decouple each rail with at least 0.1 uF ceramic per VCC pin plus 10 uF bulk per rail, placed within a few millimeters of the package. Power both rails in any order per the family datasheet power-up guidance, but avoid a floating rail during operation - verify sequencing on your board with an oscilloscope at first bring-up.
Antifuse FPGAs are one-time programmable. Freeze the netlist and complete static timing analysis and simulation sign-off before programming, because a failed or incorrect program permanently destroys the device. Always generate the fusemap with the legacy Actel/Microsemi design software matched to your speed grade and keep an archived copy of both the fuse file and the design sources for configuration management and future re-orders.
The PLCC-84 footprint uses 1.27 mm J-lead pitch with a 29.31 x 29.31 mm body. Use the JEDEC-standard PLCC-84 land pattern with socket-compatible pad geometry if field replacement is planned; add fiducials near the package corner for automated optical inspection since J-leads hide solder joints. Route unused I/O as inputs with board-level pull resistors per the datasheet I/O guidance rather than leaving them floating.
On faster speed grades (-P1 at 280 MHz, -P2 at 320 MHz toggle rate) keep clock traces short and matched, and add series termination (22-33 ohm) on output lines driving long backplane or cable runs to control ringing with the 5 V-tolerant I/O. Estimate: at a 3 ns-class output edge, traces longer than roughly 5 cm act as transmission lines and require termination on FR-4.
Compliance Information
XSourcepart distributor record states 'Lead free / RoHS Compliant' for A54SX08-PLG84I. REACH, halogen-free, and conflict-minerals status must be confirmed via Microchip's official compliance documentation.
