Skyworks Solutions Inc. SI5332AC09342-GM3

Overview

SI5332AC09342-GM3 from Silicon Labs is a 12-output, factory-programmed any-frequency clock generator with MultiSynth™ fractional synthesis, 190 fs RMS phase jitter (external crystal), 5–333.33 MHz differential output range, and user-configurable LVDS/LVPECL/HCSL/LVCMOS signal formats per output-designed for Ethernet switch timing and PCIe Gen4-compliant clock tree consolidation.

For engineers reviewing the SI5332AC09342-GM3 datasheet, SI5332AC09342-GM3 pinout, SI5332AC09342-GM3 application, or SI5332AC09342-GM3 equivalent, this device delivers deterministic low-jitter clock synthesis across mixed-voltage banks, supports I²C reconfiguration, and enables hitless frequency switching within ±1000 ppm input offset tolerance.

Technical Context

The SI5332AC09342-GM3 implements a two-stage synthesis architecture: a wideband PLL locks to a 16–50 MHz external crystal (XA/XB), then feeds up to three independent MultiSynth fractional dividers and five integer dividers. Its cross-point mux routes any synthesized or divided frequency to any of twelve differential outputs.

Each output bank (A–D) shares a dedicated VDDO supply (1.8/2.5/3.3 V), enabling mixed-supply operation; skew is adjustable in 35 ps steps per differential pair; and spread spectrum (down/center, 0.1–2.5%) is configurable per MultiSynth path via I²C or hardware pins.

Key Specifications

Pinout & Package

SI5332AC09342-GM3 uses a 48-pin QFN package (6 × 6 mm, 0.4 mm pitch) with exposed thermal pad. Pin functions are defined per the Si5332A/B/C/D 48-QFN pinout (Rev. 1.1, Section 6.1). All 48 pins serve dedicated roles including 12 differential output pairs (OUT0–OUT11), six VDDO supply pins (VDDO0–VDDO5), seven universal hardware inputs (IN1–IN7), and dual crystal interface (XA/XB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar any-frequency clock generator applications.

Compared with SI5332AC09342-GM3, the Si5332BC09342-GM3 trades frequency headroom for lower cost in integer-only systems, while the Si5338AC09342-GM reduces output count and package size without compromising jitter or configuration flexibility - both require revalidation of power delivery and thermal layout.

Availability

SI5332AC09342-GM3 is available at Aetrix Electronics and suitable for 100G Ethernet switch timing, PCIe Gen4 server clock trees, broadcast video sync generation, and industrial embedded computing requiring stable component supply across extended temperature and long production lifecycles.

Supply support for SI5332AC09342-GM3 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

Silicon Labs is a fabless semiconductor company specializing in timing, wireless, and IoT solutions, with deep expertise in low-jitter clock synthesis and programmable oscillators.

The Si5332 family was designed to replace multiple fixed-frequency clock ICs and crystals in high-speed communications infrastructure, enabling single-chip clock tree consolidation with field-programmable flexibility.

FAQ

What is the crystal frequency requirement for SI5332AC09342-GM3?

The SI5332AC09342-GM3 requires an external fundamental-mode crystal connected to XA/XB pins operating between 16 MHz and 50 MHz. It does not include an embedded crystal - this is a Si5332A-grade device. The crystal must meet load capacitance specifications (2–30 pF, programmable via register), and PCB layout must follow Silicon Labs' guidelines to maintain 190 fs RMS jitter performance. SI5332AC09342-GM3 cannot operate without a valid crystal or external clock input.

Does SI5332AC09342-GM3 support PCIe Gen4 SRIS compliance?

Yes, SI5332AC09342-GM3 is explicitly designed for PCIe Gen4 SRIS compliance. Its 190 fs RMS phase jitter (12 kHz–20 MHz) meets the PCIe Gen4 specification for reference clocks, and its spread spectrum capability (down/center, 0.1–2.5%) aligns with SRIS requirements. The device supports 100 MHz output with tight period jitter and low deterministic jitter - critical for maintaining link training stability in root complex and endpoint applications using SI5332AC09342-GM3.

How many independent voltage domains does SI5332AC09342-GM3 support?

SI5332AC09342-GM3 supports six independent output supply domains via VDDO0–VDDO5 pins, grouped into four banks (A–D). Bank A uses VDDO0/VDDO1; Bank B uses VDDO2; Bank C uses VDDO3; Bank D uses VDDO4/VDDO5. Each VDDO pin can be set to 1.8 V, 2.5 V, or 3.3 V for differential outputs, enabling true mixed-supply clock distribution - for example, 1.8 V for 25 Gbps SerDes and 3.3 V for legacy control logic - all from SI5332AC09342-GM3.

Can SI5332AC09342-GM3 generate non-integer output frequencies?

Yes, SI5332AC09342-GM3 fully supports non-integer frequency synthesis using its MultiSynth™ fractional divider architecture. It achieves zero ppm frequency error for any rational ratio between input and output, including common non-integer rates like 156.25 MHz (from 25 MHz crystal), 212.5 MHz, or 265.625 MHz. This capability is enabled by default in SI5332AC09342-GM3's Si5332A configuration and verified in ClockBuilder Pro during custom part number generation for SI5332AC09342-GM3.

What is the maximum differential output frequency of SI5332AC09342-GM3?

The maximum differential output frequency of SI5332AC09342-GM3 is 333.33 MHz. This limit applies to LVDS, LVPECL, and HCSL signal formats. The device achieves this using its MultiSynth fractional synthesis engine with no frequency error - unlike integer-only variants (e.g., Si5332B) limited to 200 MHz. Outputs above 250 MHz require careful termination and layout per Silicon Labs' reference designs to maintain signal integrity and jitter performance in SI5332AC09342-GM3 applications.