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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Skyworks Solutions Inc. SI5338A-B05431-GMR

Name: SI5338A-B05431-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338A-B05431-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338A-B05431-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338A-B05431-GMR.pdf

Description:: I2C CONTROL, 4-OUTPUT, ANY FREQU

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338A-B05431-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis. It delivers four independent, any-frequency outputs (0.16–710 MHz) with 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. It serves as a drop-in replacement for up to four crystal oscillators in high-speed serial interface timing.

For engineers reviewing the SI5338A-B05431-GMR datasheet, SI5338A-B05431-GMR pinout, SI5338A-B05431-GMR application, or SI5338A-B05431-GMR equivalent, key selection criteria include its 24-QFN package, 4× differential output capability, I²C/SMBus programmability, zero-ppm synthesis accuracy, and PCIe/10GbE/Ethernet switch timing validation.

Technical Context

The SI5338A-B05431-GMR 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 synthesizers (Stage 2) generating each output. Each output path includes configurable voltage (1.5/1.8/2.5/3.3 V), format, spread-spectrum control, and sub-20-ps phase adjustment.

It supports both free-running synthesis and external feedback (zero-delay mode), with loss-of-lock and loss-of-signal alarms, independent frequency increment/decrement (1 ppm steps), and glitchless reconfiguration via pin control or I²C. Core supply operates at 1.8/2.5/3.3 V with 45 mA typical current draw.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count & Type	4 differential clock outputs (CLK0A/B through CLK3A/B), supporting LVPECL/LVDS/HCSL/CML/SSTL/HSTL/CMOS
Frequency Range	0.16–710 MHz per output; ≥2 outputs may exceed 350 MHz simultaneously only at Fvco/4 and Fvco/6
Phase Jitter (RMS)	0.7 ps typical (12 kHz–20 MHz), meeting PCIe Gen 3 SRNS and Gen 4 Common Clock specs
Supply Voltages	Core: 1.8/2.5/3.3 V ±10%; Output buffers: independently configurable 1.4–3.63 V per driver
Input Flexibility	6 inputs: crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz)
Package	24-pin QFN, 4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad
Operating Temp	–40 °C to +85 °C ambient, qualified for industrial and telecom line card environments

Pinout & Package

SI5338A-B05431-GMR is housed in a 24-lead, 4 mm × 4 mm QFN package with exposed thermal pad (pin 24 = GND). Pin assignments are fixed across Si5338 family variants; this part uses standard Si5338 pinout.

Pin/Terminal	Circuit Role	Design Meaning
IN1/IN2, IN5/IN6	Differential Input Pairs	Accept 5–710 MHz AC-coupled differential clocks; require external 100 Ω termination
IN3/IN4	Single-Ended Inputs	Support 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL; internal 20 kΩ pull-up/down configurable
CLK0A/CLK0B – CLK3A/CLK3B	Differential Output Pairs	Four independent outputs; each pair supports LVPECL/LVDS/HCSL/CML with per-driver VDDO
VDDO0–VDDO3	Output Buffer Supplies	Independent 1.4–3.63 V supplies per output bank; enable mixed-voltage system interfacing
VDD	Core Supply	Single 1.8/2.5/3.3 V supply powering PLL, logic, and MultiSynth engines
SCL/SDA	I²C Interface	Standard SMBus-compatible 2-wire bus (up to 400 kHz); supports in-system programming
INTR	Interrupt Output	Open-drain status flag indicating loss-of-lock or loss-of-signal events

Key Features

Feature	Design Value
MultiSynth™ Synthesis	Four independent fractional-N synthesizers enabling true zero-ppm frequency accuracy on all outputs
PCIe Compliance	Fully compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 Separate Reference No Spread (SRNS)
Glitchless Frequency Tuning	Independent 1 ppm-step frequency increment/decrement via pin or I²C without output interruption
Sub-20-ps Phase Control	Programmable initial phase offset (±45 ns) and fine phase adjustment (<20 ps step resolution)
Configurable Spread Spectrum	Per-output SSC: 0.5–5.0% spread, 33–63 kHz modulation rate, 5–350 MHz range

Applications

PCIe Gen 4 Switch Timing	Ethernet Switch/Routing
Use Scenario: High-density 1U/2U switches requiring synchronized 100 MHz reference clocks for multiple PCIe Gen 4 lanes and SerDes PHYs. IC Role / Device Role / Timing Role: Primary clock generator providing four low-jitter, independently configured PCIe-compliant clocks (100 MHz, 125 MHz, 156.25 MHz, 312.5 MHz). Use Value: Eliminates need for four discrete oscillators; meets PCIe Gen 4 TJ < 33.6 ps pk-pk and SRNS RMS jitter ≤ 0.32 ps.	Use Scenario: 1/10/25 GbE line cards with multi-port PHYs, MACs, and packet processors needing precise, scalable clock trees. IC Role / Device Role / Timing Role: Quad-output timing source delivering 125 MHz (1GbE), 156.25 MHz (10GbE), 312.5 MHz (25GbE), and 25 MHz (control logic) from single device. Use Value: Reduces board area and BOM count; supports mixed-voltage interfaces (1.8 V PHYs, 3.3 V management MCU) via independent VDDO rails.
Broadcast Video Timing	FPGA/Processor Clocking
Use Scenario: SMPTE ST 2082/ST 2081 video routers and frame synchronizers requiring ultra-low-jitter, multi-frequency sync signals (e.g., 27 MHz, 74.25 MHz, 148.5 MHz). IC Role / Device Role / Timing Role: Any-frequency clock synthesizer generating broadcast-grade reference clocks with < 0.7 ps RMS jitter and < 30 ps pk-pk period jitter. Use Value: Replaces crystal-based solutions with field-programmable flexibility; maintains genlock stability under temperature drift and vibration.	Use Scenario: Heterogeneous compute platforms with FPGA fabric, ARM SoCs, DDR4/DDR5 memory controllers, and PCIe endpoints sharing a common timing domain. IC Role / Device Role / Timing Role: Centralized clock hub supplying 100 MHz (FPGA logic), 200 MHz (DDR4 PHY), 300 MHz (ARM core), and 50 MHz (peripheral bus) with matched skew and phase alignment. Use Value: Enables deterministic timing closure across domains; supports dynamic frequency scaling via I²C-controlled increment/decrement.

PCIe Gen 4 Switch Timing

Ethernet Switch/Routing

Use Scenario: High-density 1U/2U switches requiring synchronized 100 MHz reference clocks for multiple PCIe Gen 4 lanes and SerDes PHYs.

IC Role / Device Role / Timing Role: Primary clock generator providing four low-jitter, independently configured PCIe-compliant clocks (100 MHz, 125 MHz, 156.25 MHz, 312.5 MHz).

Use Value: Eliminates need for four discrete oscillators; meets PCIe Gen 4 TJ < 33.6 ps pk-pk and SRNS RMS jitter ≤ 0.32 ps.

Use Scenario: 1/10/25 GbE line cards with multi-port PHYs, MACs, and packet processors needing precise, scalable clock trees.

IC Role / Device Role / Timing Role: Quad-output timing source delivering 125 MHz (1GbE), 156.25 MHz (10GbE), 312.5 MHz (25GbE), and 25 MHz (control logic) from single device.

Use Value: Reduces board area and BOM count; supports mixed-voltage interfaces (1.8 V PHYs, 3.3 V management MCU) via independent VDDO rails.

Broadcast Video Timing

FPGA/Processor Clocking

Use Scenario: SMPTE ST 2082/ST 2081 video routers and frame synchronizers requiring ultra-low-jitter, multi-frequency sync signals (e.g., 27 MHz, 74.25 MHz, 148.5 MHz).

IC Role / Device Role / Timing Role: Any-frequency clock synthesizer generating broadcast-grade reference clocks with < 0.7 ps RMS jitter and < 30 ps pk-pk period jitter.

Use Value: Replaces crystal-based solutions with field-programmable flexibility; maintains genlock stability under temperature drift and vibration.

Use Scenario: Heterogeneous compute platforms with FPGA fabric, ARM SoCs, DDR4/DDR5 memory controllers, and PCIe endpoints sharing a common timing domain.

IC Role / Device Role / Timing Role: Centralized clock hub supplying 100 MHz (FPGA logic), 200 MHz (DDR4 PHY), 300 MHz (ARM core), and 50 MHz (peripheral bus) with matched skew and phase alignment.

Use Value: Enables deterministic timing closure across domains; supports dynamic frequency scaling via I²C-controlled increment/decrement.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5332A-D05431-GM	Higher integration: 8 outputs, integrated LDOs, lower jitter (0.35 ps RMS), supports JESD204B deterministic latency	Targeted at JESD204B ADC/DAC systems and 5G RU baseband; requires more complex configuration	Select when >4 outputs, sub-0.4 ps jitter, or deterministic latency is required; not pin-compatible
ICS8430I-01T	Fixed-frequency 4-output LVDS generator (no I²C, no frequency synthesis); 1.2 ps RMS jitter; 3.3 V only	Limited to static clock trees (e.g., legacy PCIe Gen 1/2, SATA); no spread spectrum or phase tuning	Select for cost-sensitive, non-programmable applications where frequency agility is unnecessary

Compared with Si5332A-D05431-GM and ICS8430I-01T, the SI5338A-B05431-GMR uniquely balances programmability, PCIe Gen 4 readiness, and industrial temperature operation in a compact 4×4 mm footprint-making it optimal for field-upgradable, multi-standard timing in space-constrained networking and compute platforms.

Availability

SI5338A-B05431-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video timing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338A-B05431-GMR 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 and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed specifically for high-performance, programmable clock generation in datacenter, telecom, and broadcast systems-enabling consolidation of multiple oscillators into a single, software-configurable IC with industry-leading jitter performance.

FAQ

What is the primary function of the SI5338A-B05431-GMR?

The SI5338A-B05431-GMR is a quad-output, I²C-programmable clock generator using Skyworks' MultiSynth™ technology to synthesize any frequency (0.16–710 MHz) on each output with 0.7 ps RMS typical phase jitter. It replaces up to four discrete oscillators and supports PCIe Gen 1–4, Ethernet, and broadcast video timing applications. The SI5338A-B05431-GMR integrates two-stage PLL architecture, independent output voltage/format control, and glitchless frequency tuning.

Does the SI5338A-B05431-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B05431-GMR meets PCIe Gen 4 Common Clock specifications with ≤0.45 ps RMS jitter (10 kHz–50 MHz) and supports Gen 3 Separate Reference No Spread (SRNS) mode at ≤0.32 ps RMS. It is validated per PCI-Express Base Specification 4.0 rev. 0.5 and includes dedicated jitter measurement support via Skyworks' PCIe Clock Jitter Tool. The SI5338A-B05431-GMR achieves this using its high-bandwidth PLL (1.6–5 MHz loop bandwidth) and optimized MultiSynth™ synthesis.

How many input reference sources does the SI5338A-B05431-GMR accept?

The SI5338A-B05431-GMR accepts six physical input pins (IN1–IN6), organized as three differential pairs (IN1/IN2, IN5/IN6, and optionally IN3/IN4 in differential mode), supporting crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) references. Input selection is fully programmable via I²C registers. The SI5338A-B05431-GMR's flexible input stage enables use with legacy crystals or high-speed SerDes reference clocks without external level-shifting.

Can the SI5338A-B05431-GMR generate different output voltages simultaneously?

Yes, the SI5338A-B05431-GMR provides four independent VDDO supplies (VDDO0–VDDO3), each configurable from 1.4 V to 3.63 V. This allows simultaneous LVPECL (2.5 V), LVDS (1.8 V), HCSL (1.8 V), and CMOS (3.3 V) outputs on a single device-critical for interfacing with mixed-voltage FPGAs, ASICs, and PHYs. Each output driver's voltage is set independently in the SI5338A-B05431-GMR configuration registers.

Is the SI5338A-B05431-GMR pin-compatible with other Si5338 variants?

Yes, all Si5338 variants-including SI5338A-B05431-GMR-share identical 24-QFN pinout, footprint, and thermal pad layout. Pin functions (e.g., CLK0A/B, SCL/SDA, IN1/IN2) are consistent across the family. Configuration differences (e.g., factory-programmed vs. blank OTP, frequency limits) are stored in on-chip NVM and do not affect mechanical or electrical pin compatibility. The SI5338A-B05431-GMR can be substituted for other Si5338-A grade parts without PCB changes.

SI5338A-B05431-GMR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: MultiSynth™

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: -

Main Purpose:: -

Input:: -

Output:: -

Number of Circuits:: -

Ratio - Input:Output:: -

Differential - Input:Output:: -

Frequency - Max:: -

Voltage - Supply:: -

Operating Temperature:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-QFN (4x4)

SI5338A-B05431-GMR FAQ

1.How can I place an order for SI5338A-B05431-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338A-B05431-GMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SI5338A-B05431-GMR reliable?

The price and inventory of SI5338A-B05431-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338A-B05431-GMR is usually 5 days.

3.What payment methods are accepted for SI5338A-B05431-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338A-B05431-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338A-B05431-GMR?

SI5338A-B05431-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338A-B05431-GMR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SI5338A-B05431-GMR?

For technical support, including SI5338A-B05431-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338A-B05431-GMR requirements.

6.How does Aetrix verify that SI5338A-B05431-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338A-B05431-GMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI5338A-B05431-GMR meets industry standards.

7.What is the process for return or replacement of SI5338A-B05431-GMR?

All SI5338A-B05431-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338A-B05431-GMR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SI5338A-B05431-GMR part is unused and in its original packaging.

Return procedure for SI5338A-B05431-GMR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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