Skyworks Solutions Inc. SI53204-A02AGMR

Overview

SI53204-A02AGMR from Skyworks Solutions is a 4-output PCIe Gen 1–Gen 6 compliant clock fanout buffer with HCSL-compatible differential outputs, 0.02 ps RMS max additive jitter (Gen 6), 10–200 MHz input range, and single 1.5–1.8 V supply. It serves as a low-power, spread-spectrum-tolerant timing distribution IC in PCIe add-on cards and server backplanes.

For engineers reviewing the SI53204-A02AGMR datasheet, SI53204-A02AGMR pinout, SI53204-A02AGMR application, or SI53204-A02AGMR equivalent, key selection criteria include PCIe Gen 6 jitter compliance, individual output enable control per differential pair, HCSL output drive without external termination, and 32-pin QFN (5 × 5 mm) package compatibility with high-density PCB layouts.

Technical Context

The SI53204-A02AGMR implements a passive fanout architecture with no internal PLL-jitter performance is purely additive and input-referred. It accepts LVDS/LVPECL/HCSL-compatible differential inputs (CLKIN/CLKINb) and delivers four matched HCSL differential output pairs (DIFF_0 to DIFF_3), each with dedicated OE_b control pins for dynamic power gating.

All outputs feature internally matched 85 Ω or 100 Ω output impedance, adjustable slew rate (2.4–3.7 V/ns fast / 1.9–2.9 V/ns slow), and operate across –40 °C to +85 °C ambient. Input frequency tolerance, spread-spectrum pass-through capability, and Intel QPI/UPI jitter margin are validated per specification at 100 MHz and 133 MHz reference clocks.

Key Specifications

Pinout & Package

SI53204-A02AGMR uses a 32-pin QFN (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad requiring PCB vias to internal ground plane. Pin functions are defined per Skyworks datasheet Rev 206658A (Aug 2023).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe clock buffer applications.

Compared with IDT8T49N242A-XXLFT and NB3N551DR2G, SI53204-A02AGMR delivers Gen 6 timing compliance in the smallest footprint (32-QFN), with hardware-based per-output control and zero-external-component HCSL drive-making it optimal for next-gen PCIe 6.0 add-in cards and thermally constrained servers.

Availability

SI53204-A02AGMR is available at Aetrix Electronics and suitable for PCIe add-on cards, server backplanes, and enterprise storage controllers requiring stable component supply, long-lifecycle availability, and Gen 6-compliant timing performance.

Supply support for SI53204-A02AGMR 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.

The Si532xx family-including SI53204-A02AGMR-is designed specifically for high-reliability, low-jitter PCIe clock distribution in data center and enterprise infrastructure, with emphasis on Gen 1–Gen 6 backward/forward compatibility and minimal board-space implementation.

FAQ

What is the maximum input frequency supported by the SI53204-A02AGMR?

The SI53204-A02AGMR supports a differential clock input frequency range of 10 MHz to 200 MHz, covering all PCIe Gen 1 through Gen 6 reference clock frequencies (including 100 MHz common clock and 133 MHz QPI/UPI). This range is validated per Skyworks datasheet Rev 206658A and enables direct use with standard PCIe root complex and endpoint clocks without frequency translation. The SI53204-A02AGMR does not include an internal PLL, so input frequency is passed through unchanged to all outputs.

Does the SI53204-A02AGMR require external termination resistors on its HCSL outputs?

No, the SI53204-A02AGMR integrates selectable 85 Ω or 100 Ω output impedance matching, eliminating the need for external series termination resistors on any of its four HCSL differential output pairs. This reduces PCB area, BOM count, and signal integrity variability. The SI53204-A02AGMR achieves this via on-die resistor networks calibrated during manufacturing, and the impedance value is fixed per device variant-not user-configurable in-circuit.

How does the SI53204-A02AGMR handle spread-spectrum clocking (SSC)?

The SI53204-A02AGMR is explicitly designed to be spread-spectrum tolerant: it passes through input SSC modulation without distortion or added jitter, preserving both modulation depth and frequency. This capability is verified per PCIe SRIS specifications and enables EMI reduction in host systems without requiring despread circuitry. The SI53204-A02AGMR achieves this via wideband analog front-end design and absence of internal clock multiplication-ensuring SSC integrity from CLKIN/CLKINb to all DIFF_x/DIFF_xb outputs.

What is the power consumption of the SI53204-A02AGMR at 100 MHz output frequency?

At 100 MHz with all four differential outputs enabled and VDD = VDDA = 1.8 V ±5%, the SI53204-A02AGMR draws 9–10.5 mA from VDD (core), 2.2–2.6 mA from VDDA (analog), and 16–19.5 mA from VDD_IO (output drivers), totaling ~27–33 mA dynamic supply current. In power-down mode (PWRDNb asserted), total current drops to 1.4–2.7 mA. These values are measured per Skyworks datasheet Table 4 and Table 5 and reflect real-world conditions with 5" traces and 2 pF load.

Can the SI53204-A02AGMR be used in industrial temperature environments?

Yes, the SI53204-A02AGMR is rated for operation from –40 °C to +85 °C ambient temperature and qualified for industrial applications. Its thermal resistance (θJA = 50.3 °C/W in still air) and junction-to-board (θJB = 30.9 °C/W) are specified per datasheet Table 7 for the 32-QFN package. The SI53204-A02AGMR maintains full PCIe Gen 6 jitter compliance across this range, with no derating required-making it suitable for uncooled edge servers, ruggedized storage enclosures, and factory automation controllers.