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

Skyworks Solutions Inc. SI53208-A02AGM

Name: SI53208-A02AGM
Brand: Skyworks Solutions Inc.
SKU: SI53208-A02AGM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI53208-A02AGM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: -

Datasheet:: SI53208-A02AGM.pdf

Description:: IC CLOCK BUFFER QFN

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Product details

Overview

SI53208-A02AGM from Skyworks Solutions is an 8-output PCIe Gen 1–Gen 6 clock fanout buffer with HCSL-compatible differential outputs, 0.02 ps RMS max additive jitter (Gen 6), 10–200 MHz input range, and single 1.5–1.8 V supply - deployed in high-density server backplanes and PCIe add-on cards requiring strict jitter compliance.

For engineers reviewing the SI53208-A02AGM datasheet, SI53208-A02AGM pinout, SI53208-A02AGM application, or SI53208-A02AGM equivalent, this page delivers verified package mapping (48-pin QFN, 6 × 6 mm), confirmed PCIe SRIS/CC compliance, hardware- and I²C-controllable output enables, and real-world thermal resistance (θJA = 27.9°C/W, still air).

Technical Context

The SI53208-A02AGM implements a passive fanout architecture with no internal PLL or frequency synthesis - it buffers and distributes a single differential input clock (CLKIN/CLKINb) across eight HCSL output pairs while preserving phase integrity and meeting PCIe Gen 6 additive phase jitter limits (≤0.02 ps RMS). It supports spread-spectrum input pass-through for EMI reduction and Intel QPI/UPI jitter requirements.

All eight differential outputs feature individually controllable OE_b pins with internal 100 kΩ pull-downs, adjustable slew rate (1.9–3.7 V/ns), and internal 85 Ω or 100 Ω output impedance matching - eliminating external termination resistors. Power domains are segregated: VDDA (analog), VDD (core), and VDD_IO (output drivers).

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	8 independent HCSL differential output pairs (DIFF_0 to DIFF_7)
Additive phase jitter (Gen 6)	≤0.02 ps RMS (12 kHz–20 MHz), enabling PCIe Gen 6 common clock compliance
Input frequency range	10–200 MHz differential input - supports PCIe reference clocks and QPI/UPI 100/133 MHz
Supply voltage	Single 1.5–1.8 V core/analog supply (VDD/VDDA); 0.9975–1.8 V output supply (VDD_IO)
Operating temperature	–40 °C to +85 °C ambient - qualified for industrial and data center environments
Thermal resistance (θJA)	27.9 °C/W (still air, 4-layer PCB) - enables compact thermal design without forced airflow
Package	48-pin QFN, 6 mm × 6 mm, 0.5 mm pitch - RoHS-6 compliant, lead-free

Pinout & Package

SI53208-A02AGM is housed in a 48-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks datasheet revision 206658A (August 2023), Figure 5 and Table 2.

Pin/Terminal	Circuit Role	Design Meaning
VDDA / GNDA	Analog power/ground	Separate analog domain for clock input receiver - decoupling critical for low-jitter performance
CLKIN / CLKINb	Differential clock input	Accepts 10–200 MHz LVDS/LVPECL/HCSL; crossing point 250–550 mV; slew rate 0.6–4 V/ns
DIFF_0–DIFF_7 / DIFF_0b–DIFF_7b	HCSL differential outputs	8 true/complement pairs; 85 Ω or 100 Ω internal termination; 600–850 mV high, –150–150 mV low
OE_0b–OE_7b	Individual output enable (active low)	Hardware control per output pair; internal 100 kΩ pull-down; 0 = enabled, 1 = disabled
PWRDNb	Global power-down (active low)	Disables all outputs and reduces total current to ≤1.7 mA; internal 100 kΩ pull-up
SCLK / SDA	I²C interface	Supports configuration and monitoring; SA pin sets I²C address; compatible with 100/400 kHz modes

Key Features

Feature	Design Value
PCIe Gen 1–Gen 6 compliance	Meets both Common Clock (CC) and Separate Reference Independent Spread (SRIS) specifications per PCIe Base Spec
Spread-spectrum tolerance	Passes through spread-input clocks without degradation - enables system-level EMI reduction
Adjustable output slew rate	Configurable fast/slow settings (1.9–3.7 V/ns) to optimize signal integrity across varied trace lengths and loads
No external termination required	Internal 85 Ω or 100 Ω output impedance matching eliminates 2× resistors per output pair - saves board space and BOM cost
Low-power operation	Total dynamic current ≤51.5 mA at 1.5 V (all outputs active, 100 MHz, 2 pF load) - suitable for thermally constrained modules

Applications

PCIe Server Backplane	High-Density Storage Controller
Use Scenario: Distributing a single 100 MHz PCIe reference clock to 8 downstream slots on a 1U server motherboard with tight thermal and layout constraints. IC Role / Device Role / Timing Role: Low-jitter fanout buffer ensuring Gen 6 timing margin across all lanes while supporting SRIS mode for link training. Use Value: Eliminates need for multiple discrete clock sources; maintains <0.02 ps RMS additive jitter at each output under full load.	Use Scenario: Clocking NVMe SSD controllers and SAS expanders in a 24-bay JBOD enclosure where EMI must meet CISPR 32 Class A limits. IC Role / Device Role / Timing Role: Spread-spectrum tolerant buffer passing dithered input to reduce radiated emissions without jitter penalty. Use Value: Enables system-level EMI compliance without adding filtering components or sacrificing PCIe Gen 5/6 timing headroom.
PCIe Add-in Card	Intel QPI/UPI Interconnect
Use Scenario: Providing clean, low-skew clock distribution for FPGA-based acceleration cards with multiple PCIe x16 interfaces. IC Role / Device Role / Timing Role: 8-output HCSL buffer with individual OE_b control - allows dynamic lane shutdown to reduce power during idle states. Use Value: Reduces dynamic current by >30% when disabling unused outputs via hardware pins - no I²C transaction latency.	Use Scenario: Delivering jitter-clean 100 MHz reference clocks to CPU-to-CPU QPI links and UPI interconnects in dual-socket servers. IC Role / Device Role / Timing Role: Compliant clock source meeting Intel's additive jitter limits: ≤0.09 ps RMS (UPI) and ≤0.12 ps RMS (QPI @133 MHz). Use Value: Passes Intel validation with margin - avoids costly re-spin due to interconnect timing failures.

PCIe Server Backplane

High-Density Storage Controller

Use Scenario: Distributing a single 100 MHz PCIe reference clock to 8 downstream slots on a 1U server motherboard with tight thermal and layout constraints.

IC Role / Device Role / Timing Role: Low-jitter fanout buffer ensuring Gen 6 timing margin across all lanes while supporting SRIS mode for link training.

Use Value: Eliminates need for multiple discrete clock sources; maintains <0.02 ps RMS additive jitter at each output under full load.

Use Scenario: Clocking NVMe SSD controllers and SAS expanders in a 24-bay JBOD enclosure where EMI must meet CISPR 32 Class A limits.

IC Role / Device Role / Timing Role: Spread-spectrum tolerant buffer passing dithered input to reduce radiated emissions without jitter penalty.

Use Value: Enables system-level EMI compliance without adding filtering components or sacrificing PCIe Gen 5/6 timing headroom.

PCIe Add-in Card

Intel QPI/UPI Interconnect

Use Scenario: Providing clean, low-skew clock distribution for FPGA-based acceleration cards with multiple PCIe x16 interfaces.

IC Role / Device Role / Timing Role: 8-output HCSL buffer with individual OE_b control - allows dynamic lane shutdown to reduce power during idle states.

Use Value: Reduces dynamic current by >30% when disabling unused outputs via hardware pins - no I²C transaction latency.

Use Scenario: Delivering jitter-clean 100 MHz reference clocks to CPU-to-CPU QPI links and UPI interconnects in dual-socket servers.

IC Role / Device Role / Timing Role: Compliant clock source meeting Intel's additive jitter limits: ≤0.09 ps RMS (UPI) and ≤0.12 ps RMS (QPI @133 MHz).

Use Value: Passes Intel validation with margin - avoids costly re-spin due to interconnect timing failures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe clock fanout applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT8T49N242B	8-output, 1.8 V only; higher typical additive jitter (0.035 ps RMS Gen 6); requires external 85 Ω terminations	Limited to 1.8 V systems; lacks spread-spectrum tolerance and individual OE_b pins	Choose when legacy 1.8 V-only designs require drop-in replacement without layout change - verify jitter margin with system-level testing.
ON Semiconductor NB3N551	4-output only; supports only PCIe Gen 1–3; 0.15 ps RMS Gen 3 additive jitter; no SRIS support	Not suitable for Gen 4+ or SRIS-enabled platforms; lacks QPI/UPI compliance documentation	Select only for cost-sensitive Gen 3 add-in cards where 4 outputs suffice and PCIe specification margin is not critical.

Compared with IDT8T49N242B and NB3N551, SI53208-A02AGM uniquely delivers Gen 6 readiness, hardware-controlled output gating, and integrated termination - making it the only option among the three qualified for next-generation server and storage platforms requiring SRIS and QPI/UPI coexistence.

Availability

SI53208-A02AGM is available at Aetrix Electronics and suitable for data centers, PCIe add-on cards, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-6 compliance.

Supply support for SI53208-A02AGM 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 infrastructure, automotive, and industrial markets.

The Si532xx family was engineered specifically for PCIe timing distribution - prioritizing ultra-low additive jitter, spread-spectrum compatibility, and hardware configurability to meet evolving server and storage platform requirements.

FAQ

What is the maximum input frequency supported by the SI53208-A02AGM?

The SI53208-A02AGM supports a differential input clock frequency range of 10 MHz to 200 MHz, covering all standard PCIe reference frequencies (100 MHz, 133 MHz) and enabling flexibility for custom timing architectures. This range is validated per Skyworks datasheet 206658A, Table 6.

Does the SI53208-A02AGM require external termination resistors for its HCSL outputs?

No, the SI53208-A02AGM integrates selectable 85 Ω or 100 Ω output impedance matching, eliminating the need for external termination resistors on each HCSL output pair. This reduces PCB area, BOM count, and signal integrity variability - confirmed in datasheet Section 1 and Table 6.

How does the SI53208-A02AGM handle spread-spectrum clocking?

The SI53208-A02AGM is explicitly spread-spectrum tolerant: it passes through a dithered input clock without amplifying or distorting the modulation, enabling system-level EMI reduction. This behavior is documented in the Key Features section and validated per PCIe SRIS compliance testing in the datasheet.

What is the power-down current consumption of the SI53208-A02AGM?

In full power-down mode (PWRDNb asserted), the SI53208-A02AGM draws ≤1.7 mA total supply current at 1.5 V, as specified in Table 4 of the datasheet. This includes contributions from VDD, VDDA, and VDD_IO domains - enabling aggressive power gating in idle states.

Is the SI53208-A02AGM pin-compatible with other members of the Si532xx family?

No - the SI53208-A02AGM uses a 48-pin QFN package, while Si53212 (12-output) uses 64-pin QFN and Si53204 (4-output) uses 32-pin QFN. Pin counts, layouts, and power domain assignments differ; PCB redesign is required for cross-family substitution.

SI53208-A02AGM Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: *

Package/Case:: -

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

PLL:: -

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Output:: -

Number of Circuits:: -

Ratio - Input:Output:: -

Differential - Input:Output:: -

Frequency - Max:: -

Voltage - Supply:: -

Operating Temperature:: -

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Supplier Device Package:: -

SI53208-A02AGM FAQ

1.How can I place an order for SI53208-A02AGM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI53208-A02AGM 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 SI53208-A02AGM reliable?

The price and inventory of SI53208-A02AGM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI53208-A02AGM is usually 5 days.

3.What payment methods are accepted for SI53208-A02AGM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI53208-A02AGM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI53208-A02AGM?

SI53208-A02AGM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI53208-A02AGM 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 SI53208-A02AGM?

For technical support, including SI53208-A02AGM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI53208-A02AGM requirements.

6.How does Aetrix verify that SI53208-A02AGM is sourced from the original manufacturer or authorized distributors?

All SI53208-A02AGM 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 SI53208-A02AGM meets industry standards.

7.What is the process for return or replacement of SI53208-A02AGM?

All SI53208-A02AGM units undergo pre-shipment inspection (PSI). If there is an issue with SI53208-A02AGM, 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 SI53208-A02AGM part is unused and in its original packaging.

Return procedure for SI53208-A02AGM:

1.Submit a request within 90 days.

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

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