Skyworks Solutions Inc. SI5338C-B04376-GM

Overview

SI5338C-B04376-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 Common Clock and Gen 3 SRNS compliance, and operation from 1.8/2.5/3.3 V core supply in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in high-speed serial interface timing.

For engineers reviewing the SI5338C-B04376-GM datasheet, SI5338C-B04376-GM pinout, SI5338C-B04376-GM application, or SI5338C-B04376-GM equivalent, key selection considerations include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage per driver (1.5–3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and loss-of-lock/loss-of-signal alarm support.

Technical Context

The SI5338C-B04376-GM implements a two-stage PLL architecture: a high-performance integer-N PLL (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesis blocks (Stage 2) generating each output. Each output supports programmable phase offset (<20 ps step resolution), frequency increment/decrement (1 ppm steps), and spread-spectrum modulation (33–63 kHz rate).

Input flexibility includes external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz); outputs support LVPECL/LVDS (0.16–710 MHz), HCSL (0.16–250 MHz), CMOS (0.16–200 MHz), and SSTL/HSTL (0.16–350 MHz), with independent VDDO per driver (1.4–3.63 V) and full I²C/SMBus configuration.

Key Specifications

Pinout & Package

SI5338C-B04376-GM uses a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Rev. 1.6 datasheet, Section 7 (Pin Descriptions) and Section 8 (Device Pinout by Part Number).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM and ICS853S01AGI-01LFT, SI5338C-B04376-GM uniquely delivers field-programmable any-frequency synthesis, independent output voltage control, and PCIe Gen 4–compliant jitter performance - making it suitable for agile, multi-standard systems where clock requirements evolve post-deployment.

Availability

SI5338C-B04376-GM is available at Aetrix Electronics and suitable for PCIe switch timing, Ethernet routing, broadcast video synchronization, and FPGA clocking applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for SI5338C-B04376-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 for wireless, broadband, automotive, and industrial markets.

The Si5338 family is designed as a high-performance, low-jitter clock generator platform targeting multi-protocol serial interface timing - specifically engineered to replace discrete oscillators and simplify clock tree design in PCIe, Ethernet, and broadcast video systems.

FAQ

What is the primary function of the SI5338C-B04376-GM?

The SI5338C-B04376-GM is an I²C-programmable quad clock generator that synthesizes any frequency from 0.16 to 710 MHz on each of its four independent outputs using Skyworks' MultiSynth™ technology. It serves as a replacement for up to four crystal oscillators, supporting PCIe Gen 1–4, Ethernet, broadcast video, and FPGA clocking applications with 0.7 ps RMS typical phase jitter and flexible input/output voltage configurations.

Does the SI5338C-B04376-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338C-B04376-GM is explicitly specified for PCIe Gen 4 Common Clock compliance with 0.15–0.45 ps RMS jitter (10 kHz–50 MHz) and meets the PCI-Express Base Specification 4.0 rev. 0.5 requirements. Its low-jitter performance, programmable PLL bandwidth (2–5 MHz), and SRNS mode support make it suitable for high-speed switch and accelerator applications requiring Gen 4 timing integrity.

How many input reference sources does the SI5338C-B04376-GM support?

The SI5338C-B04376-GM supports six input reference sources: two differential pairs (IN1/IN2 and IN5/IN6), two single-ended pins (IN3 and IN4), and an internal crystal oscillator circuit compatible with 8–30 MHz crystals. This allows flexible connectivity to external clocks (e.g., 25 MHz PCIe refclk, 125 MHz Ethernet clock) or crystal-based local timing.

Can the SI5338C-B04376-GM generate different output voltages on each channel?

Yes, the SI5338C-B04376-GM provides independent VDDO supply pins (VDDO0–VDDO3) for each output bank, supporting 1.4–3.63 V per driver. This enables simultaneous LVDS (2.5 V), HCSL (1.8 V), and CMOS (3.3 V) outputs without external level shifters - critical for interfacing with heterogeneous logic families in modern SoC and FPGA designs.

Is ClockBuilder Pro software required to configure the SI5338C-B04376-GM?

No, ClockBuilder Pro is optional but strongly recommended for efficient configuration of the SI5338C-B04376-GM. The device supports full I²C/SMBus register-level programming, allowing custom firmware to write configuration data directly. However, ClockBuilder Pro simplifies setup by auto-generating initialization scripts, validating jitter performance, and exporting configuration files for production programming - significantly reducing development time for SI5338C-B04376-GM integration.