Skyworks Solutions Inc. SI52204-A02AGM

Overview

SI52204-A02AGM from Skyworks Solutions is a 4-output, PCIe Gen 1–7 and SRIS-compliant clock generator with LP-HCSL differential outputs, 100 MHz nominal frequency, 0.085 ps RMS jitter, and 1.5–1.8 V dual-supply operation (VDD/VDD_IO). It integrates individual output enable pins, spread-spectrum control, and a 25 MHz LVCMOS reference clock output for server motherboard timing distribution.

For engineers reviewing the SI52204-A02AGM datasheet, SI52204-A02AGM pinout, SI52204-A02AGM application, or SI52204-A02AGM equivalent, this page delivers verified specifications, validated pin functions, PCIe Gen 6/7 jitter compliance data, and real-world substitution guidance for high-density compute platforms.

Technical Context

The SI52204-A02AGM implements a low-phase-noise PLL with integrated spread-spectrum modulation (–0.25% or –0.5% down-spread), configurable via hardware pins (SS_EN, FS) or I²C. Its push-pull LP-HCSL drivers eliminate external termination resistors and support 100 Ω or 85 Ω internal line matching.

It accepts a 25 MHz crystal or clock input (XIN/CLKIN), provides one buffered 25 MHz LVCMOS REF output, and supports Wake-on-LAN via PWRGD/PWRDNb - excluding Si52202 but confirmed for SI52204 per datasheet Section 3.3 and Feature List.

Key Specifications

Pinout & Package

SI52204-A02AGM uses a 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with an exposed ground pad requiring thermal vias. Pin functions are defined in Skyworks datasheet Rev. 206549B, Section 3.3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si52208-A02AGM, SI52204-A02AGM reduces board area and power by 30% for 4-lane applications; versus ICS8430I-01LG, it delivers 30% lower jitter, 50% lower supply voltage, and integrated spread-spectrum - critical for Gen 5+ compliance and thermal-constrained NICs.

Availability

SI52204-A02AGM is available at Aetrix Electronics and suitable for server motherboards, PCIe add-in cards, storage arrays, and network interface cards requiring stable component supply, long-term lifecycle support, and PCIe Gen 6/7 timing compliance.

Supply support for SI52204-A02AGM 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 Si522xx family was designed specifically for PCIe Gen 1–7 timing infrastructure, emphasizing ultra-low jitter, flexible power domains, and hardware-configurable features to simplify high-speed board design in data center and enterprise computing.

FAQ

What is the maximum PCIe generation supported by SI52204-A02AGM?

SI52204-A02AGM supports PCIe Gen 1 through Gen 7, including both common clock and Separate Reference Independent Spread Spectrum (SRIS) architectures. Its 0.085 ps RMS jitter meets PCIe Gen 6 specifications with design margin and is validated for Gen 7 compliance per Skyworks datasheet Rev. 206549B, Section 1 and Feature List.

Does SI52204-A02AGM support spread-spectrum clocking?

Yes, SI52204-A02AGM supports triangular spread-spectrum clocking with two down-spread options: –0.25% and –0.5%. This is controlled via the SS_EN pin (tri-level input) or I²C register configuration, and is explicitly documented in datasheet Section 3.3 and Feature List for the SI52204 variant.

Can SI52204-A02AGM generate frequencies other than 100 MHz?

No - SI52204-A02AGM is fixed at 100 MHz output frequency. While the FS pin exists, Skyworks documentation states that 133 MHz and 200 MHz selections apply only to Si52212 and Si52208; SI52204 and SI52202 are limited to 100 MHz, as confirmed in datasheet Section 1 and Table 1 footnote.

Is the 25 MHz LVCMOS REF output present on SI52204-A02AGM?

Yes, SI52204-A02AGM includes a dedicated 25 MHz LVCMOS REF output on the REF/SA pin. This buffered clock drives ASICs or SoCs and is enabled by default unless disabled via I²C register Byte 2 Bit 3 (REF_OE), as specified in datasheet Section 3.3 and Table 3.

What package type and pin count does SI52204-A02AGM use?

SI52204-A02AGM uses a 32-pin QFN package measuring 5 mm × 5 mm with 0.5 mm pitch and an exposed thermal pad. This matches the mechanical description in datasheet Figure 7 and Section 3.3, and is distinct from the 20-pin (Si52202), 48-pin (Si52208), and 64-pin (Si52212) variants.