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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Skyworks Solutions Inc. SL2309SI-1

Name: SL2309SI-1
Brand: Skyworks Solutions Inc.
SKU: SL2309SI-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SL2309SI-1

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SL2309SI-1.pdf

Description:: IC BUFFER 140MHZ 9CH 3.3V 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SL2309SI-1 from Silicon Laboratories is a low-skew, low-jitter, 3.3 V zero-delay buffer (ZDB) IC that distributes one reference clock to nine synchronized outputs (4+4+1), with 10–100 MHz operation (standard drive), 140 ps max cycle-to-cycle jitter, and 150 ps max output-to-output skew - used in industrial-grade digital copiers and network servers requiring precise clock fanout.

For engineers reviewing the SL2309SI-1 datasheet, SL2309SI-1 pinout, SL2309SI-1 application, or SL2309SI-1 equivalent, key selection concerns include industrial temperature support (−40°C to +85°C), SOIC-16 package compatibility, PLL bypass mode control via S1/S2 pins, and load-dependent frequency limits (e.g., 66 MHz max at 30 pF with standard drive).

Technical Context

The SL2309SI-1 integrates an on-chip SpreadThru™ PLL that locks to CLKIN and uses CLKOUT as internal feedback; it supports both active PLL mode (zero-delay tracking) and PLL-bypass mode (S2=1, S1=0) for non-zero-delay fanout operation. Its dual-bank architecture (Bank A: CLKA1–CLKA4; Bank B: CLKB1–CLKB4) enables selective tri-state control per bank using S1/S2 logic inputs.

It features weak internal pull-up (250 kΩ) on S1/S2 and weak pull-down (250 kΩ) on CLKIN/outputs, operates at 3.3 V ±10%, and includes input frequency detection that forces all outputs to Hi-Z if CLKIN is DC or floating - reducing supply current to ≤25 µA in shutdown mode.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	10–100 MHz (standard drive, CL = 15 pF); up to 66 MHz at 30 pF - defines usable clock rate under specified capacitive loading.
Cycle-to-Cycle Jitter	75–150 ps (typical 70 ps at 66 MHz, CL = 15 pF, standard drive) - directly impacts timing margin in high-speed synchronous systems.
Output-to-Output Skew	≤150 ps (all outputs equally loaded) - ensures deterministic phase alignment across distributed clocks.
Supply Voltage	3.3 V ±10% (3.0–3.6 V) - requires stable LDO or regulator; internal 1.8 V PLL rail ensures consistent jitter/skew performance.
Power Supply Current	26 mA max at 66 MHz (all outputs active, S1=S2=1) - determines thermal design and power budget in dense PCB layouts.
Operating Temperature	−40°C to +85°C (Industrial grade) - validated for extended ambient conditions in embedded networking and office equipment.
Package	16-pin SOIC (150-mil) - compatible with standard surface-mount assembly and reflow profiles.

Pinout & Package

SL2309SI-1 is housed in a 16-pin SOIC (150-mil) package with 1.27 mm pitch, 10.3 mm × 7.5 mm body size, and exposed pad not present. Thermal resistance θ_JA is 120°C/W (still air).

Pin/Terminal	Circuit Role	Design Meaning
1 CLKIN	Input	Reference clock input with 250 kΩ weak pull-down; triggers PLL lock or shutdown based on signal presence.
2–3,14–15 CLKA1–CLKA4	Output	Bank A clock outputs; individually controllable via S1/S2; weak pull-down aids signal integrity during tri-state.
6–7,10–11 CLKB1–CLKB4	Output	Bank B clock outputs; identical electrical specs to Bank A; enables independent power gating per bank.
4,13 VDD	Power	Dual 3.3 V supply pins - require local 0.1 µF ceramic decoupling each, placed adjacent to pins.
5,12 GND	Power	Dual ground pins - minimize ground bounce between banks and reduce inter-bank skew.
8 S2, 9 S1	Input	Select control inputs with 250 kΩ weak pull-up; decode into four states (tri-state A/B, bypass PLL, or full drive) per Table 2.
16 CLKOUT	Output	PLL feedback output; externally tied to system load - adjusting its capacitance tunes input-to-output delay for zero-delay calibration.

Key Features

Feature	Design Value
SpreadThru™ PLL	Passes spread-spectrum clock (SSC) modulation unaltered from CLKIN to all outputs - preserves EMI reduction without degrading spread profile.
Select-mode tri-state control	S1/S2 logic enables dynamic power reduction: tri-stating Bank B cuts ~50% active current and lowers jitter when only four clocks are needed.
Zero-delay calibration	Adjusting CLKOUT load relative to Bank A/B loads fine-tunes input-to-output delay - achieves true zero delay without external delay lines or FPGA compensation.
Input frequency detection	Automatically disables PLL and forces all outputs Hi-Z if CLKIN is static or missing - prevents false clocking and reduces system-level fault propagation.
Industrial-grade reliability	Qualified from −40°C to +85°C with 250 kΩ internal bias resistors and 2.5 kV HBM ESD rating - suitable for uncontrolled thermal environments in MFPs and routers.

Applications

Digital Copiers	Network Routers
Use Scenario: Synchronizing image processing ASICs, scanner engines, and print controllers within a multi-function peripheral chassis. IC Role / Device Role / Timing Role: Zero-delay clock distribution hub ensuring deterministic timing across heterogeneous subsystems sharing a common crystal reference. Use Value: Eliminates inter-subsystem setup/hold violations caused by trace-length mismatches, enabling higher throughput without FPGA-based deskew logic.	Use Scenario: Driving multiple Ethernet PHYs, switch fabric interfaces, and packet processors in a 1U rack-mounted router. IC Role / Device Role / Timing Role: Low-skew fanout buffer delivering phase-aligned 25 MHz/125 MHz clocks to SERDES lanes and MAC controllers. Use Value: Reduces bit-error rate (BER) by maintaining <150 ps inter-lane skew - critical for IEEE 802.3 compliance at 1 GbE and above.
Industrial PCs	DTV Mainboards
Use Scenario: Providing synchronized clocks to CPU, GPU, memory controller, and I/O hubs in fanless industrial PC designs operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Industrial-temperature-rated ZDB replacing discrete clock trees - maintains timing integrity under thermal stress where standard commercial buffers fail. Use Value: Enables long-term reliability without derating or thermal throttling, avoiding costly redesigns for extended temperature validation.	Use Scenario: Distributing pixel clock, audio clock, and HDMI TMDS clock from a single oscillator in cost-sensitive digital TV mainboards. IC Role / Device Role / Timing Role: Multi-output clock buffer supporting mixed-frequency domains (e.g., 27 MHz video, 44.1 kHz audio, 148.5 MHz TMDS) with shared PLL stability. Use Value: Reduces BOM count vs. discrete oscillators while meeting JEDEC jitter limits (<1 ns period jitter) for HDMI 1.4 compliance.

Digital Copiers

Network Routers

Use Scenario: Synchronizing image processing ASICs, scanner engines, and print controllers within a multi-function peripheral chassis.

IC Role / Device Role / Timing Role: Zero-delay clock distribution hub ensuring deterministic timing across heterogeneous subsystems sharing a common crystal reference.

Use Value: Eliminates inter-subsystem setup/hold violations caused by trace-length mismatches, enabling higher throughput without FPGA-based deskew logic.

Use Scenario: Driving multiple Ethernet PHYs, switch fabric interfaces, and packet processors in a 1U rack-mounted router.

IC Role / Device Role / Timing Role: Low-skew fanout buffer delivering phase-aligned 25 MHz/125 MHz clocks to SERDES lanes and MAC controllers.

Use Value: Reduces bit-error rate (BER) by maintaining <150 ps inter-lane skew - critical for IEEE 802.3 compliance at 1 GbE and above.

Industrial PCs

DTV Mainboards

Use Scenario: Providing synchronized clocks to CPU, GPU, memory controller, and I/O hubs in fanless industrial PC designs operating continuously at 60°C ambient.

IC Role / Device Role / Timing Role: Industrial-temperature-rated ZDB replacing discrete clock trees - maintains timing integrity under thermal stress where standard commercial buffers fail.

Use Value: Enables long-term reliability without derating or thermal throttling, avoiding costly redesigns for extended temperature validation.

Use Scenario: Distributing pixel clock, audio clock, and HDMI TMDS clock from a single oscillator in cost-sensitive digital TV mainboards.

IC Role / Device Role / Timing Role: Multi-output clock buffer supporting mixed-frequency domains (e.g., 27 MHz video, 44.1 kHz audio, 148.5 MHz TMDS) with shared PLL stability.

Use Value: Reduces BOM count vs. discrete oscillators while meeting JEDEC jitter limits (<1 ns period jitter) for HDMI 1.4 compliance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT5V9885BGI	8-output, 3.3 V, 10–133 MHz; no SpreadThru™; 200 ps max cycle-to-cycle jitter; TSSOP-20 package.	Lacks SSC pass-through; higher jitter limits; larger footprint - unsuitable for EMI-sensitive DTV or SSD applications requiring spread spectrum.	Choose only if SpreadThru™ and SOIC-16 fit are non-critical and lower channel count suffices.
ICS8302AM-01LFT	9-output, 3.3 V, 10–110 MHz; no PLL bypass mode; 100 ps max cycle-to-cycle jitter; SOIC-16 package.	No S1/S2-selectable tri-state or PLL bypass - fixed full-drive operation increases power and limits flexibility in partial-clock-use scenarios.	Prefer when guaranteed 100 ps jitter is mandatory and dynamic power control is unnecessary.

Compared with SL2309SI-1, IDT5V9885BGI offers fewer outputs and no spread-spectrum support, while ICS8302AM-01LFT provides tighter jitter but eliminates runtime power optimization - making SL2309SI-1 uniquely balanced for industrial clock fanout with adaptive control.

Availability

SL2309SI-1 is available at Aetrix Electronics and suitable for digital copiers, network routers, and industrial PCs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SL2309SI-1 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

Silicon Laboratories Inc. is a U.S.-based fabless semiconductor company specializing in timing, MCU, and connectivity solutions, with design centers in Austin, TX and global sales offices.

The SL2309 product line delivers low-jitter, low-power clock distribution ICs targeting high-reliability embedded systems in printing, networking, and consumer electronics - emphasizing zero-delay accuracy and industrial-grade robustness.

FAQ

What is the maximum operating frequency of SL2309SI-1 under industrial temperature and 30 pF load?

The SL2309SI-1 supports up to 66 MHz when driving a 30 pF load at −40°C to +85°C (Industrial grade) with standard drive configuration. This limit is defined in the switching specifications table and verified across temperature and voltage corners. Exceeding this frequency risks increased jitter and potential PLL unlock. SL2309SI-1 must be operated within these constraints to maintain guaranteed 150 ps output-to-output skew and 150 ps cycle-to-cycle jitter performance.

Does SL2309SI-1 support spread-spectrum clocking (SSC)?

Yes, SL2309SI-1 implements SpreadThru™ technology that passes spread-spectrum modulation from CLKIN to all nine outputs without degradation in spread percentage, profile, or modulation frequency. This feature is intrinsic to the PLL architecture and applies in all active PLL modes. SL2309SI-1 does not alter SSC parameters - enabling EMI reduction in DTV and PC platforms while preserving timing compliance. The specification is confirmed in the General Description and SpreadThru™ Feature sections of the datasheet.

How does the S1/S2 select logic affect SL2309SI-1 power consumption?

S1 and S2 pins control power state: with S2=0/S1=0, both banks go Hi-Z, reducing supply current to ≤25 µA; with S2=0/S1=1, only Bank A drives, cutting active current by ~50% versus full operation. These states are documented in Table 2 and validated in IDD test conditions. SL2309SI-1 leverages this for dynamic power scaling - critical in thermally constrained MFPs. The weak pull-up resistors (250 kΩ) ensure defined states during power-up.

Can SL2309SI-1 achieve true zero input-to-output delay, and how is it calibrated?

Yes, SL2309SI-1 achieves zero delay by matching the capacitive load on CLKOUT to that on Bank A/B outputs - since CLKOUT feeds the PLL, its load directly sets the feedback phase. Figure 1 shows delay variation vs. load difference; adjusting CLKOUT's external capacitor tunes delay from −220 ps to +220 ps. This calibration is required per board layout and is detailed in the External Components section. SL2309SI-1 provides this adjustability without external components beyond passive loading.

Is SL2309SI-1 RoHS compliant and lead-free?

Yes, SL2309SI-1 is RoHS compliant and lead-free, as explicitly stated in the Ordering Information note #3 of the datasheet. It meets EU Directive 2011/65/EU and is manufactured using Pb-free solderable terminations. The SOIC package uses matte tin plating over copper leadframe. SL2309SI-1 conforms to JEDEC JS-001 ESD standards and is qualified for industrial reflow profiles including peak temperatures up to 260°C.

SL2309SI-1 Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: -

PLL:: Yes with Bypass

Input:: Clock

Output:: LVCMOS

Number of Circuits:: 1

Ratio - Input:Output:: 1:9

Differential - Input:Output:: No/No

Frequency - Max:: 140MHz

Divider/Multiplier:: No/No

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-SOIC

SL2309SI-1 FAQ

1.How can I place an order for SL2309SI-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SL2309SI-1 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 SL2309SI-1 reliable?

The price and inventory of SL2309SI-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SL2309SI-1 is usually 5 days.

3.What payment methods are accepted for SL2309SI-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SL2309SI-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SL2309SI-1?

SL2309SI-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SL2309SI-1 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 SL2309SI-1?

For technical support, including SL2309SI-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SL2309SI-1 requirements.

6.How does Aetrix verify that SL2309SI-1 is sourced from the original manufacturer or authorized distributors?

All SL2309SI-1 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 SL2309SI-1 meets industry standards.

7.What is the process for return or replacement of SL2309SI-1?

All SL2309SI-1 units undergo pre-shipment inspection (PSI). If there is an issue with SL2309SI-1, 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 SL2309SI-1 part is unused and in its original packaging.

Return procedure for SL2309SI-1:

1.Submit a request within 90 days.

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

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