Skyworks Solutions Inc. SI5338N-B06108-GM

Overview

SI5338N-B06108-GM from Skyworks Solutions is an I²C-programmable quad clock generator with four independent differential output drivers, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats across 0.16–710 MHz. It replaces up to four crystal oscillators in high-speed processor, FPGA, and Ethernet switch timing systems.

For engineers reviewing the SI5338N-B06108-GM datasheet, SI5338N-B06108-GM pinout, SI5338N-B06108-GM application, or SI5338N-B06108-GM equivalent, key selection criteria include its MultiSynth™ fractional-N synthesis architecture, independent per-output voltage (1.5/1.8/2.5/3.3 V), 1 ppm frequency increment/decrement capability, <20 ps phase step resolution, and 24-QFN package with exposed thermal pad.

Technical Context

The SI5338N-B06108-GM implements a two-stage PLL architecture: a high-stability integer-N Phase-Locked Loop (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 MultiSynth supports integer or fractional division with 1 ppb frequency resolution.

Output stage configuration includes programmable drive strength, slew rate control, and independent supply rails (VDDO0–VDDO3) enabling mixed-signal interface compatibility. The device supports external feedback for zero-delay mode, loss-of-lock and loss-of-signal alarms, and glitchless frequency/phase adjustments via dedicated pins or I²C.

Key Specifications

Pinout & Package

SI5338N-B06108-GM uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad (Pin 24 = GND). Pin assignments are fixed per the Si5338 family: inputs IN1–IN6 occupy pins 1,2,5,6,11,12; outputs CLK0A/B through CLK3A/B occupy pins 16–23; power pins VDD (pins 8,9), VDDO0–VDDO3 (pins 15,2,10,20); control pins SCL/SDA/INTR (pins 7,14,13); and reserved ground (Pin 19).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D06108-GM and ICS8430I-01T, the SI5338N-B06108-GM uniquely balances field-programmability, PCIe Gen 4 compliance, and industrial temperature operation in a proven 24-QFN footprint-making it optimal for mid-life-cycle upgrades and mixed-signal timing consolidation.

Availability

SI5338N-B06108-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch design, FPGA-based video processing, and telecom line card development requiring stable component supply and long-term lifecycle assurance.

Supply support for SI5338N-B06108-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 product line delivers programmable, low-jitter clock generation for high-speed digital systems-designed specifically to replace multiple fixed-frequency oscillators while supporting PCIe, Ethernet, and broadcast video timing standards.

FAQ

What is the primary function of the SI5338N-B06108-GM in a timing architecture?

The SI5338N-B06108-GM serves as an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single reference input. Its MultiSynth™ architecture enables precise frequency generation (0.16–710 MHz) with 0.7 ps RMS typical jitter, making SI5338N-B06108-GM ideal for replacing multiple crystal oscillators in FPGA, processor, and high-speed serial interface timing systems.

Does the SI5338N-B06108-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338N-B06108-GM meets PCIe Gen 4 common clock jitter specifications with 0.15–0.45 ps RMS jitter (10 kHz–50 MHz bandwidth) when configured per Skyworks AN562 guidelines. It is validated for use in PCIe Gen 4 root complexes and endpoints, and SI5338N-B06108-GM supports both common clock and separate reference no spread (SRNS) topologies required by the PCIe Base Specification 4.0.

How many input reference sources can the SI5338N-B06108-GM accept simultaneously?

The SI5338N-B06108-GM supports up to six physical input pins (IN1–IN6), grouped into three differential pairs (IN1/IN2, IN5/IN6, IN3/IN4), allowing selection among crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) references. Only one reference is active at a time; switching is performed via I²C register configuration, and SI5338N-B06108-GM includes automatic loss-of-signal detection and failover logic.

Can the SI5338N-B06108-GM generate different output voltages on each channel?

Yes, the SI5338N-B06108-GM provides four independent output supply rails-VDDO0, VDDO1, VDDO2, and VDDO3-that can be set to 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows each of the four output drivers (CLK0–CLK3) to drive different interface standards (e.g., LVDS at 2.5 V, HCSL at 1.8 V, CMOS at 3.3 V) simultaneously without external level shifters, and SI5338N-B06108-GM maintains full jitter performance across all combinations.

Is ClockBuilder Pro software required to configure the SI5338N-B06108-GM?

ClockBuilder Pro is strongly recommended but not strictly required: it provides GUI-based configuration, validation against jitter and timing constraints, and auto-generation of initialization scripts for SI5338N-B06108-GM. However, full register-level control is possible via direct I²C writes using the documented register map in the Si5338 datasheet Rev. 1.6, and SI5338N-B06108-GM supports runtime reprogramming without reset.