Skyworks Solutions Inc. SI5338C-B10489-GM

Overview

SI5338C-B10489-GM from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential or single-ended outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 and SRNS compliance, and MultiSynth™ frequency synthesis supporting 0.16–710 MHz output ranges across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats. It replaces up to four crystal oscillators in high-speed networking and FPGA timing applications.

For engineers reviewing the SI5338C-B10489-GM datasheet, SI5338C-B10489-GM pinout, SI5338C-B10489-GM application, or SI5338C-B10489-GM equivalent, key selection criteria include its 4-output any-frequency synthesis capability, independent per-output voltage (1.5/1.8/2.5/3.3 V), spread-spectrum control, phase/frequency increment/decrement features, and 24-QFN package compatibility with PCIe, Ethernet, and broadcast video timing systems.

Technical Context

The SI5338C-B10489-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesis blocks, each feeding a programmable output driver. Its input flexibility supports external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential clocks (5–710 MHz).

Each of the four output drivers supports independent format selection (LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL), independent supply voltage (1.5–3.3 V), independent phase offset (±45 ns, <20 ps step), and independent spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate). The device operates across –40 to +85 °C with core supply options at 1.8/2.5/3.3 V.

Key Specifications

Pinout & Package

SI5338C-B10489-GM is housed in a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments follow Skyworks' standard Si5338 pinout: dual differential inputs (IN1/IN2, IN5/IN6), two single-ended inputs (IN3, IN4), four differential output pairs (CLK0A/B through CLK3A/B), three dedicated output supply rails (VDDO0–VDDO3), core supply (VDD), I²C interface (SCL/SDA), interrupt (INTR), and reserved ground (RSVD_GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D07489-GM, SI5338C-B10489-GM offers simpler configuration and lower cost for mid-tier applications requiring flexible synthesis without deterministic latency; compared with ICS853S01AG-01, it provides full frequency agility and multi-format support essential for heterogeneous SoC/FPGA timing.

Availability

SI5338C-B10489-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch design, 10/25 GbE routing infrastructure, and broadcast video timing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338C-B10489-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 leader in analog semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with over 30 years of RF and precision timing IP.

The Si5338 product line was designed specifically for high-performance, multi-protocol clock generation in datacenter, telecom, and broadcast systems - delivering programmable flexibility without sacrificing jitter performance or power efficiency.

FAQ

What is the maximum output frequency supported by SI5338C-B10489-GM in LVPECL format?

The SI5338C-B10489-GM supports up to 710 MHz in LVPECL format per output, as confirmed in Table 6 of the official Skyworks datasheet Rev. 1.6. This capability enables direct clocking of high-speed SerDes interfaces such as 28 Gbps PAM4 transceivers when used with appropriate termination and layout practices. The device maintains 0.7 ps RMS jitter even at these frequencies with proper differential input conditioning.

Does SI5338C-B10489-GM support PCIe Gen 4 Common Clock architecture?

Yes, SI5338C-B10489-GM is explicitly validated for PCIe Gen 4 Common Clock operation with ≤0.45 ps RMS jitter (10 kHz–50 MHz band), meeting PCI-SIG Base Specification 4.0 requirements. This is documented in Table 12 of the datasheet under "PCIe Gen 4, Common Clock" test condition using a 2–4 MHz PLL bandwidth and 10 MHz CDR filter.

Can SI5338C-B10489-GM generate four different output frequencies simultaneously?

Yes, SI5338C-B10489-GM uses four independent MultiSynth™ synthesis blocks to generate four fully independent output frequencies - for example, 100 MHz, 125 MHz, 156.25 MHz, and 312.5 MHz - all simultaneously with 0 ppm theoretical error. Each output can be set to any frequency within its supported range (e.g., 0.16–710 MHz for LVPECL) without affecting others.

What package type and footprint does SI5338C-B10489-GM use?

SI5338C-B10489-GM uses a 24-lead QFN package measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. This matches Skyworks' standardized Si5338 footprint (documented in Section 9 of the datasheet), enabling drop-in compatibility across the Si5338 family and simplifying PCB design reuse for timing upgrades.

How is SI5338C-B10489-GM programmed, and is external nonvolatile memory required?

SI5338C-B10489-GM is programmed via its I²C/SMBus interface using Skyworks' ClockBuilder Pro software, which generates configuration files and supports both in-system programming and OTP (one-time programmable) NVM loading. The device contains on-chip OTP memory, so no external EEPROM or Flash is required for field deployment after initial programming.