Skyworks Solutions Inc. SI5334C-B05948-GM

Overview

SI5334C-B05948-GM from Skyworks Solutions is a pin-controlled, quad-output any-frequency clock generator with four independently configurable differential clock outputs. It synthesizes frequencies from 0.16 MHz to 710 MHz per output using MultiSynth fractional-N PLL technology, delivers 0.7 ps RMS typical phase jitter, supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, and operates from 1.8/2.5/3.3 V core and output supplies - deployed in PCIe 3.0 timing, FPGA clocking, and broadcast video systems.

For engineers reviewing the SI5334C-B05948-GM datasheet, SI5334C-B05948-GM pinout, SI5334C-B05948-GM application, or SI5334C-B05948-GM equivalent, this page provides verified technical context, factory-programmed configuration details, jitter performance data at 125 MHz and 155.52 MHz, pin-level control logic for phase/frequency adjustment, and real-world substitution guidance for multi-protocol timing designs.

Technical Context

The SI5334C-B05948-GM implements a fully integrated fractional-N PLL with on-chip VCO, loop filter, and four independent MultiSynth synthesis stages - each driving one of four differential output pairs (CLK0A/B through CLK3A/B). Input flexibility includes crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) references.

Each output supports independent format selection (LVPECL up to 710 MHz, LVDS up to 350 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz), independent output supply voltage (1.5/1.8/2.5/3.3 V), and independent phase offset (±45 ns in <20 ps steps). Frequency increment/decrement is supported on CLK0A/B only, with 1 ppm step resolution and glitchless operation.

Key Specifications

Pinout & Package

SI5334C-B05948-GM is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Si5334 family and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-output clock generator applications.

Compared with Si5332A-D05948-GM, SI5334C-B05948-GM offers simpler pin-control deployment and lower power (45 mA vs. 68 mA), while ICS8430I-01LG trades synthesis capability for lower unit cost and guaranteed fixed-frequency stability - making SI5334C-B05948-GM optimal for field-programmable, multi-protocol timing where jitter, flexibility, and footprint are prioritized.

Availability

SI5334C-B05948-GM is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe 3.0 reference clocking, and broadcast video synchronization requiring stable component supply, long-term lifecycle support, and guaranteed factory programming.

Supply support for SI5334C-B05948-GM 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, with leadership in RF, timing, and precision analog ICs for infrastructure and high-performance systems.

The Si5334 product line delivers pin-configurable, low-jitter clock generation for multi-protocol digital systems - designed specifically for applications demanding flexible frequency synthesis, mixed-voltage interface, and deterministic phase control without software overhead.

FAQ

What is the factory-programmed configuration of SI5334C-B05948-GM?

The SI5334C-B05948-GM is pre-programmed by Skyworks with a specific frequency plan, output formats, voltage levels, and phase offsets - stored in on-chip OTP memory. Upon power-up, it begins operation immediately without external configuration. The exact settings for SI5334C-B05948-GM are defined in Skyworks' standard frequency plan B05948 and cannot be altered in the field without dedicated programming hardware.

Does SI5334C-B05948-GM support spread spectrum clocking (SSC)?

Yes, SI5334C-B05948-GM supports PCIe-compliant spread spectrum on any output clock operating at exactly 100 MHz with Rn divider = 1. It delivers –0.5% frequency deviation at a modulation rate of 30–33 kHz, reducing electromagnetic interference in host systems without violating PCIe 2.0/3.0 timing budgets.

Can SI5334C-B05948-GM generate 156.25 MHz on all four outputs simultaneously?

Yes, SI5334C-B05948-GM can generate 156.25 MHz on all four differential outputs simultaneously - within its 0.16–350 MHz LVDS/LVPECL range and supported by MultiSynth integer-mode synthesis. Jitter remains at 0.7 ps RMS typical (12 kHz–20 MHz), meeting requirements for 10G Ethernet and CPRI applications.

What is the maximum output frequency supported by SI5334C-B05948-GM in LVPECL format?

SI5334C-B05948-GM supports LVPECL output up to 710 MHz, verified per Table 4 in the datasheet. This applies when the MultiSynth output frequency is configured between Fvco/4 and Fvco/6 (two unique frequencies above Fvco/8), and requires proper termination with 100 Ω differential load and AC coupling.

Is SI5334C-B05948-GM compatible with 1.8 V-only system designs?

Yes, SI5334C-B05948-GM supports full operation with 1.8 V core supply (VDD = 1.71–1.98 V) and independent 1.8 V output supplies (VDDOx). All outputs - including LVDS and HCSL - are specified down to 1.8 V, enabling seamless integration into low-voltage FPGA and ASIC timing architectures.