A54SX16P-PQ208I - 24K Gate SX FPGA, 175 I/O, PQ208 | Microchip
MPN: A54SX16P-PQ208I β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
Drop-in alternatives for A54SX16P-PQ208I β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
A54SX16P-PQ208
β Drop-Inπ Reference alternative (not in catalog)
A54SX16P-1PQ208
β Drop-Inπ Reference alternative (not in catalog)
A54SX16A-PQ208I
β Drop-Inπ Reference alternative (not in catalog)
A54SX16A-1PQ208I
β Drop-Inπ Reference alternative (not in catalog)
A54SX16A-2PQ208I
β Drop-Inπ Reference alternative (not in catalog)
A54SX16P-P2PQ208I
β Drop-Inπ Reference alternative (not in catalog)
A54SX16P-PQ208I Maximum Ratings & Electrical Characteristics
| Series | SX (54SX Family) |
| Number of Gates | 24,000 gates |
| Number of CLBs / Logic Blocks | 1,452 CLBs |
| User I/O | 175 |
| Internal Performance | 320 MHz |
| Clock-to-Out (Pin-to-Pin) | 3.7 ns |
| Input Set-Up Time | 0.1 ns |
| Clock Skew | 0.25 ns |
| Supply Voltage (Core) | 3 V to 3.6 V |
| Supply Voltage (5V Domain) | 4.75 V to 5.25 V |
| I/O Standard | 3.3 V operation with 5.0 V tolerant inputs |
| Operating Temperature | -40C to +85C (TA) |
| Package / Case | 208-BFQFP |
| Supplier Device Package | 208-PQFP (28x28 mm) |
| Terminal Pitch | 0.5 mm |
| JESD-30 Code | S-PQFP-G208 |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Product Status | Obsolete |
A54SX16P-PQ208I 208-pqfp (28x28 mm) Pin Configuration Guide
Complete pinout information for A54SX16P-PQ208I (208-pqfp (28x28 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 A54SX16P-PQ208I.
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
A54SX16P-PQ208I is suitable for 6 applications: 66 MHz PCI Bus Interface, Industrial Control Backplanes, Telecommunications Line Cards, Legacy 5V System Integration, Aviation and Defense Legacy Sustainment, Test and Measurement Instrument Logic.
66 MHz PCI Bus Interface
The A54SX16P-PQ208I fits 66 MHz PCI designs directly: its 3.7 ns pin-to-pin clock-to-out, 0.1 ns input setup, and 0.25 ns clock skew satisfy the PCI local bus timing budget at 66 MHz as a single-chip solution, according to the 54SX family datasheet. The P-variant's 5.0V-tolerant inputs interface cleanly with 3.3V PCI signaling while tolerating 5V legacy rails on mixed boards. In the circuit, the FPGA implements the PCI state machine, target/master logic, and glue integration, replacing multiple CPLDs and discrete logic. Because the antifuse fabric is one-time programmable and deterministic, timing closure at 66 MHz does not require iterative routing passes. The trade-off is fixed configuration - changes require a new programmed device rather than in-system reflash.
Recommended
Industrial Control Backplanes
Industrial backplane controllers benefit from the A54SX16P-PQ208I's -40C to +85C industrial rating and 5.0V-tolerant I/O, which bridges legacy 5V PLC signal chains with 3.3V logic. The 175 user I/O pins provide enough parallel field interfaces - optocoupler inputs, relay drive outputs, and encoder feedback - to replace several mid-scale logic devices on one chip. In typical designs the FPGA sits on the backplane handling address decoding, interrupt aggregation, and watchdog logic with deterministic, configuration-hardened behavior that survives power cycles without a configuration host. The 24,000-gate capacity with 100% resource utilization allows dense decoding logic at 320 MHz internal speed. Designers should account for the obsolete status by pre-positioning the listed same-footprint SX16A/SX32 alternatives.
Recommended
Telecommunications Line Cards
Telecom line cards historically used SX-family FPGAs for framing, TDM switching, and backplane interconnect, and the A54SX16P-PQ208I fits that role with 1,452 CLBs and 175 user I/O. Its 320 MHz internal performance supports E1/T1 bit processing and 66 MHz-class backplane timing, while the 0.25 ns clock skew keeps multi-bank synchronous interfaces aligned across the 208-pin PQFP. The antifuse configuration is radiation-tolerant in behavior compared with SRAM cells in terms of configuration persistence - no configuration scrubbing is needed at power-up. On the card, the part typically implements the card-side glue, HDLC controllers, and backplane drivers. Because supply is broker-dependent for this obsolete part, qualify A54SX16P-PQ208 or the A54SX16A PQ208I variants as second sources during design freeze.
Recommended
Legacy 5V System Integration
The defining application advantage of the A54SX16P-PQ208I is 3.3V core operation with 5.0V-tolerant inputs, letting engineers integrate modern 3.3V logic into boards that still carry 5V TTL signals - no bus switches or series-resistor tricks required. The dual supply range (3V to 3.6V core, 4.75V to 5.25V on the 5V domain) allows both rails to coexist on the board per the SX family datasheet. Typical circuits place the FPGA at the junction of a 5V backplane and 3.3V processor subsystem, handling level-tolerant buffering, address latching, and bus arbitration. The 208-PQFP's 0.5 mm pitch is hand-reviewable for legacy rework environments. Verify the P-variant specifically - the plain A54SX16A lacks the 5V-tolerant input ring.
Recommended
Aviation and Defense Legacy Sustainment
SX-family antifuse FPGAs were widely deployed in defense and avionics subsystems, and the A54SX16P-PQ208I's deterministic, configuration-retentive fabric suits those sustainment programs. The industrial -40C to +85C rating, 24,000 gates, and 175 I/O cover typical workload modules: MIL-STD-1553-style glue logic, discrete sampling, and built-in-test controllers. Because the antifuse configuration cannot be upset by configuration-memory errors, the device does not require configuration scrubbing circuitry, simplifying qualification of legacy designs. In sustainment engineering, the circuit role is unchanged - the challenge is sourcing, since the part is obsolete; XAIPART lists the A54SX16A-PQ208I and A54SX16A-2PQ208I same-footprint variants, and A54SX32 PQ208 members as board-compatible recompilation paths for extended life programs.
Recommended
Test and Measurement Instrument Logic
Instrument platforms use FPGA glue logic for timing generators, trigger distribution, and interface translation, and the A54SX16P-PQ208I delivers this with 0.25 ns clock skew and 320 MHz internal speed, keeping multi-channel timing relationships tight. The 175 user I/O pins fan out to front-end comparators, DACs, and backplane connectors from one 208-PQFP device, and the 3.7 ns pin-to-pin clock-to-out supports responsive external trigger paths. In a typical instrument, the FPGA sits between the analog front end and the host CPU, implementing handshaking and FIFO control; the antifuse fabric's deterministic timing simplifies calibration documentation. Note the one-time-programmable nature: firmware fixes require replacing programmed devices, so stock programmed spares. The obsolete status makes the listed PQ208 same-footprint alternatives important for service continuity.
Recommended
Recommended Products Summary
Engineering reference data for A54SX16P-PQ208I β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | A54SX16P-PQ208 | A54SX16A-PQ208I | A54SX16A-2PQ208I | A54SX16P-P2PQ208I |
|---|---|---|---|---|---|
| Package | 208-PQFP (28x28 mm, BFQFP) | 208-PQFP - same footprint | 208-PQFP - same footprint | 208-PQFP - same footprint | 208-PQFP - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Gate Count | 24,000 | 24,000 | 24,000 | 24,000 | 24,000 (16,000 typical) |
| User I/O | 175 | 175 | 175 | 175 | 175 |
| 5.0V-Tolerant Inputs (P variant) | Yes | Yes | No (A die) | No (A die) | Yes |
| Internal Performance | 320 MHz | 320 MHz | 320 MHz | 320 MHz (grade -2) | 320 MHz (grade P2) |
| Temperature Grade | -40C to +85C (Industrial) | Commercial (no I suffix) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Unit Price (qty 1) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- 5.0V-tolerant inputs on a 3.3V FPGA (vs A54SX16A-PQ208I)
- 66 MHz PCI single-chip timing (vs A54SX16P-1PQ208)
- Same-footprint upgrade headroom (vs A54SX32-PQ208I)
Design Notes
Estimated: the A54SX16P requires two supply domains - 3V to 3.6V for the core/3.3V logic and, where 5V-tolerant I/O is used, 4.75V to 5.25V on the 5V domain. Sequence both rails before relying on input tolerance; treat simultaneous power-up as default. Decouple each supply pin pair with 0.1 uF ceramic capacitors placed within 3 mm of the pin, plus bulk 10 uF per rail. Static and dynamic current figures should be taken from the 54SX family datasheet power calculator in Libero Designer, as they depend on toggle rates.
The 208-PQFP has a 0.5 mm pitch and 28x28 mm body; design the land pattern per the datasheet mechanical drawing (JESD-30 S-PQFP-G208 outline). Keep unused user I/O either driven or configured per the Libero Designer defaults to avoid floating inputs. Route the JTAG/test pins to a header even if unused - antifuse devices need programming access before assembly and failure-analysis access later. Use solid ground pour under the device for return paths at 66 MHz PCI-class edge rates.
Three frequent mistakes with this part: (1) substituting an A54SX16A (A die) where the P-die 5.0V-tolerant inputs are required - the A die is not 5V tolerant and inputs may be overstressed on 5V nets; (2) ignoring speed-grade suffixes - timing closure at 66 MHz PCI was characterized for specific grades, so substituting -1 grade parts may violate pin-to-pin timing; (3) treating the device as reprogrammable - the antifuse fabric is one-time programmable, so firmware bugs after programming require a new physical device. Always keep spare programmed units for obsolete-part designs.
Compliance Information
The A54SX16P-PQ208I is a legacy/obsolete part predating consistent RoHS documentation in the provided data; the PQG208 suffix variants typically denote lead-free packages. Verify compliance certificates with Microchip for any specific date code.
