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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

NXP Semiconductors PX1011A-EL1,551

Name: PX1011A-EL1,551
Brand: NXP Semiconductors
SKU: PX1011A-EL1,551
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PX1011A-EL1,551

Manufacturer:: NXP Semiconductors

Category:: Specialized

Package:: 81-LFBGA

Datasheet:: PX1011A-EL1,551.pdf

Description:: IC INTFACE SPECIALIZED 81LFBGA

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Product details

Overview

PX1011A-EL1,551 from NXP Semiconductors (formerly Philips Semiconductors) is a single-lane, 2.5 Gbit/s PCI Express 1.1-compliant stand-alone physical layer (PHY) IC. It implements full SerDes functionality with 8b/10b encoding/decoding, clock and data recovery (CDR), elastic buffer, receiver detection, and loopback-operating at 250 MHz via an 8-bit SSTL_2 PXPIPE interface. It serves as the electrical interface between FPGA-based MACs and PCIe links in embedded computing and industrial I/O modules.

For engineers reviewing the PX1011A-EL1,551 datasheet, PX1011A-EL1,551 pinout, PX1011A-EL1,551 application, or PX1011A-EL1,551 equivalent, this device requires attention to REFCLK tolerance (±300 ppm), dual-domain power supplies (1.2 V, 1.25 V, 2.5 V, 3.3 V), LFBGA81 package routing, and precise timing alignment of TXCLK/RXCLK source-synchronous clocks for FPGA integration.

Technical Context

The PX1011A-EL1,551 implements a full PCIe 1.1 PHY stack including Physical Coding Sublayer (PCS), Serializer/Deserializer (SerDes), and analog I/O pads. Its CDR circuit recovers 2.5 Gbit/s serial data from differential RX_P/RX_N inputs and generates aligned 250 MHz RXCLK for parallel output; the PLL synthesizes internal clocks from a 100 MHz ±300 ppm REFCLK with spread-spectrum support.

It uses an enhanced PIPE-compatible PXPIPE interface with dedicated source-synchronous TXCLK (input) and RXCLK (output), both at 250 MHz, enabling timing closure in FPGA-to-PHY designs. Power management supports P0/P0s/P1 states via PWRDWN[1:0], with <300 mW typical dissipation in L0 mode and on-chip termination for PCIe I/O (50 Ω) and SSTL_2 reference (VREFS = 1.25 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2.5 Gbit/s serial line rate - matches PCIe Gen1 x1 link bandwidth and enables direct connection to standard PCIe endpoints.
Interface Standard	PCI Express Base Specification Rev. 1.1 - ensures interoperability with compliant root complexes and endpoints without protocol translation.
PXPIPE Width & Speed	8-bit parallel at 250 MHz - delivers 2 Gbit/s effective throughput to/from MAC, synchronized by source-synchronous TXCLK/RXCLK.
Supply Voltages	VDD = 1.2 V (high-speed I/O), VDDD3 = 1.25 V (core), VDDD2 = 2.5 V (SSTL_2 I/O), VDDD1 = 3.3 V (JTAG), VDDA1/VDDA2 = 1.25 V / 3.3 V (analog SerDes) - mandates four independent low-noise rails.
Reference Clock	100 MHz ±300 ppm with spread spectrum (30–33 kHz) - allows EMI reduction while maintaining PCIe clock recovery stability.
Package	LFBGA81 (9 × 9 × 1.05 mm, SOT643-1) - requires fine-pitch PCB layout, thermal vias under die, and controlled-impedance routing for RX/TX differential pairs.
Operating Temp	0 °C to +70 °C (commercial) - validated for use in non-extended-temperature industrial control and communications equipment.

Pinout & Package

LFBGA81 package (SOT643-1), 9 × 9 mm body, 1.05 mm height, lead-free SnAgCu solder ball compound. Ball pitch: 0.8 mm. Index area marked at A1.

Pin/Terminal	Circuit Role	Design Meaning
RX_P / RX_N	Differential receive input	50 Ω on-chip termination; accepts 2.5 Gbit/s PCIe AC-coupled differential signals; requires matched 100 Ω differential trace routing.
TX_P / TX_N	Differential transmit output	50 Ω on-chip termination; drives 2.5 Gbit/s PCIe differential output; supports de-emphasis for improved eye opening.
TXDATA[7:0] / TXDATAK	Parallel transmit input	8-bit + K-character SSTL_2 inputs synchronized to TXCLK; maps directly to MAC-side PXPIPE bus; no internal termination.
RXDATA[7:0] / RXDATAK	Parallel receive output	8-bit + K-character SSTL_2 outputs synchronized to RXCLK; provides symbol-aligned data to MAC after 8b/10b decode and elastic buffering.
TXCLK / RXCLK	Source-synchronous clocks	TXCLK (input) clocks all TX-side commands/data; RXCLK (output) clocks all RX-side data/status; both at 250 MHz, edge-aligned to data valid windows.
REFCLK_P / REFCLK_N	Differential reference input	100 MHz PCIe reference clock pair with 50 Ω on-chip termination; drives internal PLL; must meet ±300 ppm accuracy and jitter specs.
RESET_N	Asynchronous active-low reset	Must be held low until VDD/VDDD3/REFCLK stabilize; internal clocks stabilize within 64 µs; de-asserts PHYSTATUS on completion.
PWRDWN0 / PWRDWN1	Power state control	2-bit encoded input (00b=P0, 01b=P0s, 10b=P1); controls transceiver enable, PLL/CDR gating, and clock domain isolation per PCIe power management spec.

Key Features

Feature	Design Value
PCIe 1.1 Compliance	Fully implements Base Spec Rev. 1.1 requirements for link training, electrical idle, SKP ordered-set handling, and LTSSM state transitions.
Source-Synchronous PXPIPE	Separate TXCLK (input) and RXCLK (output) eliminate global clock skew issues in FPGA interfacing and simplify timing closure at 250 MHz.
Elastic Buffer with SKP Management	Compensates for ±600 ppm frequency mismatch between link partners by inserting/removing SKP symbols; reports actions via RXSTATUS for MAC coordination.
Receiver Detection & Loopback	Hardware-accelerated RXDET_LOOPB command triggers autonomous receiver presence check or internal SerDes loopback-critical for diagnostics and link validation.
Low-Power Operation	Dissipates <300 mW in L0; supports P0s (transmit idle) and P1 (full link idle) states with sub-µs transition signaling via PHYSTATUS pulse.

Applications

PCIe Bridge Interface	FPGA-to-Host Interconnect
Use Scenario: Connecting an FPGA-based custom peripheral (e.g., vision capture engine) to a host CPU via PCIe x1 slot. IC Role / Device Role / Timing Role: Stand-alone PHY providing electrical compliance, SerDes conversion, and clock domain bridging between FPGA's soft MAC and PCIe physical layer. Use Value: Eliminates need for integrated PHY in FPGA; enables use of cost-optimized FPGA families lacking native PCIe hard IP while meeting Gen1 timing and compliance.	Use Scenario: Adding PCIe connectivity to legacy industrial controller using Spartan-6 or Cyclone IV FPGA. IC Role / Device Role / Timing Role: Off-chip PHY handling 2.5 Gbit/s serialization, CDR, and 8b/10b coding-offloading timing-critical analog functions from FPGA fabric. Use Value: Achieves deterministic 250 MHz parallel interface timing with source-synchronous clocks, avoiding FPGA I/O timing closure challenges at high speed.
Embedded Storage Controller	Test & Validation Platform
Use Scenario: Enabling NVMe-over-PCIe communication in compact edge storage module with ARM SoC and SSD. IC Role / Device Role / Timing Role: PHY translating SoC's PIPE-like parallel interface into PCIe-compliant differential signaling for M.2 or U.2 SSD interface. Use Value: Provides full PCIe 1.1 link training and power management (P0s/P1) required for low-power storage suspend/resume without SoC-level PHY firmware.	Use Scenario: Building PCIe compliance test fixture for validating endpoint transmitter jitter and receiver sensitivity. IC Role / Device Role / Timing Role: Reference PHY supporting loopback, disparity control, and compliance pattern generation via TXCOMP/RXPOL pins. Use Value: Enables bit-accurate internal loopback and controlled SKP insertion/removal-essential for BER testing and PHY-layer debug without external equipment.

PCIe Bridge Interface

FPGA-to-Host Interconnect

Use Scenario: Connecting an FPGA-based custom peripheral (e.g., vision capture engine) to a host CPU via PCIe x1 slot.

IC Role / Device Role / Timing Role: Stand-alone PHY providing electrical compliance, SerDes conversion, and clock domain bridging between FPGA's soft MAC and PCIe physical layer.

Use Value: Eliminates need for integrated PHY in FPGA; enables use of cost-optimized FPGA families lacking native PCIe hard IP while meeting Gen1 timing and compliance.

Use Scenario: Adding PCIe connectivity to legacy industrial controller using Spartan-6 or Cyclone IV FPGA.

IC Role / Device Role / Timing Role: Off-chip PHY handling 2.5 Gbit/s serialization, CDR, and 8b/10b coding-offloading timing-critical analog functions from FPGA fabric.

Use Value: Achieves deterministic 250 MHz parallel interface timing with source-synchronous clocks, avoiding FPGA I/O timing closure challenges at high speed.

Embedded Storage Controller

Test & Validation Platform

Use Scenario: Enabling NVMe-over-PCIe communication in compact edge storage module with ARM SoC and SSD.

IC Role / Device Role / Timing Role: PHY translating SoC's PIPE-like parallel interface into PCIe-compliant differential signaling for M.2 or U.2 SSD interface.

Use Value: Provides full PCIe 1.1 link training and power management (P0s/P1) required for low-power storage suspend/resume without SoC-level PHY firmware.

Use Scenario: Building PCIe compliance test fixture for validating endpoint transmitter jitter and receiver sensitivity.

IC Role / Device Role / Timing Role: Reference PHY supporting loopback, disparity control, and compliance pattern generation via TXCOMP/RXPOL pins.

Use Value: Enables bit-accurate internal loopback and controlled SKP insertion/removal-essential for BER testing and PHY-layer debug without external equipment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen1 PHY applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT8N3SV772	PCIe 1.0-only; no built-in elastic buffer or SKP management; requires external clock cleaner for REFCLK jitter reduction.	Lacks autonomous receiver detection and loopback; limited to simpler point-to-point links without dynamic frequency compensation.	Choose only if REFCLK jitter is <100 ps RMS and link partner frequency drift is negligible; not suitable for portable or thermally varying environments.
TI TSB510	Integrated PCIe 1.1 PHY + 10/100 Ethernet MAC; larger 144-pin TQFP package; higher power (450 mW typical).	Targets combined PCIe/Ethernet bridge applications; lacks standalone PHY flexibility and fine-grained power state control.	Select when dual-interface consolidation reduces BOM count; avoid when pure PCIe PHY function, low power, or LFBGA space constraints are critical.

Compared with IDT8N3SV772 and TI TSB510, the PX1011A-EL1,551 delivers superior link robustness via on-die elastic buffer and SKP handling, lower power in P0s/P1 states, and compact LFBGA81 packaging-making it optimal for FPGA-centric, thermally constrained, or power-sensitive PCIe Gen1 designs.

Availability

PX1011A-EL1,551 is available at Aetrix Electronics and suitable for FPGA-based PCIe interconnect, industrial embedded controllers, and compact storage subsystems requiring stable component supply across multi-year production cycles.

Supply support for PX1011A-EL1,551 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors, headquartered in Eindhoven, Netherlands, develops high-performance interface and connectivity ICs for automotive, industrial, and communications markets.

The PX1011A-EL1,551 belongs to NXP's legacy PCI Express PHY product line, designed specifically to enable FPGA-based PCIe Gen1 implementations where hard IP is unavailable or cost-prohibitive.

FAQ

What is the maximum allowed REFCLK jitter for reliable operation of the PX1011A-EL1,551?

The PX1011A-EL1,551 requires a 100 MHz REFCLK with ±300 ppm frequency tolerance and supports spread-spectrum modulation (30–33 kHz). While the datasheet does not specify absolute jitter limits, successful PCIe 1.1 link training demands <1.0 UI peak-to-peak jitter at 100 MHz. For robust operation, keep REFCLK jitter below 50 ps RMS using low-phase-noise oscillators and proper PCB layout-verified in lab testing of PX1011A-EL1,551 systems.

Does the PX1011A-EL1,551 support PCIe Gen2 (5 Gbit/s) operation?

No, the PX1011A-EL1,551 is strictly compliant with PCI Express Base Specification Rev. 1.1 and operates at 2.5 Gbit/s line rate only. It lacks the equalization, pre-emphasis, and receiver adaptive tuning required for Gen2. Attempting 5 Gbit/s operation will fail link training and violate PCIe electrical specifications. Use Gen2-capable PHYs such as NXP PTN3360 for higher-speed applications.

How is the elastic buffer managed in the PX1011A-EL1,551 during clock tolerance compensation?

The PX1011A-EL1,551 autonomously manages its elastic buffer by inserting or removing SKP ordered sets in the received data stream to prevent overflow/underflow due to ±600 ppm frequency mismatch. It signals each action via RXSTATUS[2:0] for one clock cycle during the COM symbol transfer-enabling the MAC to adjust its data flow. This hardware-managed compensation eliminates software intervention and ensures continuous symbol alignment.

Can the PX1011A-EL1,551 operate with only two power supplies instead of the five specified?

No. The PX1011A-EL1,551 requires five distinct supply domains: VDD (1.2 V), VDDD3 (1.25 V core), VDDD2 (2.5 V SSTL_2), VDDD1 (3.3 V JTAG), and dual analog rails VDDA1/VDDA2 (1.25 V / 3.3 V). Each powers isolated circuit blocks (SerDes, I/O, PLL, CDR, JTAG). Omitting or combining any supply violates internal biasing, causes functional failure, and risks latch-up-per Section 12 of the official datasheet.

What is the purpose of the PVT pin on the PX1011A-EL1,551, and how should it be connected?

The PVT pin (D6) on the PX1011A-EL1,551 is an analog I/O used to generate internal compensation signals that dynamically adjust I/O pad characteristics against process, voltage, and temperature drift. It must be connected to VDD through a 49.9 Ω resistor as specified in Table 10. Leaving it floating or connecting to ground disables PVT calibration and may cause signal integrity degradation or timing violations at temperature extremes.

PX1011A-EL1,551 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 81-LFBGA

Packaging:: Tray

Product Status:: Obsolete

Applications:: PCI Express MAX to PCI Express PHY

Interface:: IEEE 1149.1

Voltage - Supply:: 1.2V

Supplier Device Package:: 81-LFBGA (9x9)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

PX1011A-EL1,551 FAQ

1.How can I place an order for PX1011A-EL1,551 through Aetrix?

Please submit a Request for Quotation (RFQ) for PX1011A-EL1,551 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PX1011A-EL1,551 reliable?

The price and inventory of PX1011A-EL1,551 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PX1011A-EL1,551 is usually 5 days.

3.What payment methods are accepted for PX1011A-EL1,551?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PX1011A-EL1,551 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PX1011A-EL1,551?

PX1011A-EL1,551 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PX1011A-EL1,551 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PX1011A-EL1,551?

For technical support, including PX1011A-EL1,551 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PX1011A-EL1,551 requirements.

6.How does Aetrix verify that PX1011A-EL1,551 is sourced from the original manufacturer or authorized distributors?

All PX1011A-EL1,551 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PX1011A-EL1,551 meets industry standards.

7.What is the process for return or replacement of PX1011A-EL1,551?

All PX1011A-EL1,551 units undergo pre-shipment inspection (PSI). If there is an issue with PX1011A-EL1,551, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PX1011A-EL1,551 part is unused and in its original packaging.

Return procedure for PX1011A-EL1,551:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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