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Skyworks Solutions Inc. SL2305SI-1T
- Part No.:
- SL2305SI-1T
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SL2305SI-1T.pdf
- Description:
- IC BUFFER 140MHZ 5CH 3.3V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
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Product details
Overview
SL2305SI-1T from Silicon Laboratories is a low-skew, low-jitter, 3.3 V zero-delay buffer (ZDB) IC with SpreadThru™ PLL architecture, delivering up to five synchronized clock outputs from one reference input. It operates from 10 MHz to 100 MHz (standard drive), supports industrial temperature range (–40°C to +85°C), and draws ≤14 mA at 66 MHz - used in clock distribution for digital copiers, routers, and embedded systems.
For engineers reviewing the SL2305SI-1T datasheet, SL2305SI-1T pinout, SL2305SI-1T application, or SL2305SI-1T equivalent, key selection criteria include output-to-output skew (≤150 ps), power-down current (<25 µA), load-dependent frequency limits, and SOIC-8 packaging compatibility with industrial-grade thermal performance.
Technical Context
The SL2305SI-1T integrates an on-chip PLL that locks to CLKIN and uses internal feedback from CLKOUT to achieve zero input-to-output delay. Its SpreadThru™ architecture preserves spread-spectrum modulation characteristics when driven by SSC inputs.
It features five CMOS-compatible outputs (CLK1–CLK4 + CLKOUT), all with weak 250 kΩ pull-downs, and enters tri-state power-down mode when CLKIN is DC - disabling the PLL and reducing supply current to <25 µA. Output drive strength is standard (-1), limiting max frequency to 100 MHz at 30 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 10–100 MHz (standard drive, CL = 30 pF); defines usable clock distribution range under typical PCB loading. |
| Cycle-to-Cycle Jitter | ≤170 ps at 66 MHz, CL = 30 pF; impacts timing margin in high-speed synchronous interfaces like DDR or PCIe root clocks. |
| Output-to-Output Skew | ≤150 ps (all outputs equally loaded); ensures deterministic phase alignment across multiple downstream clock domains. |
| Power Supply Range | 3.0–3.6 V (3.3 V ±10%); compatible with standard LDO-regulated 3.3 V rails and includes internal 1.8 V PLL regulator for jitter stability. |
| Power-Down Current | ≤25 µA (industrial grade); enables low-power standby in systems requiring clock gating without external control logic. |
| Output Drive Type | Standard-drive (-1), ZOUT ≈ 32 Ω (typical); matches 50 Ω traces with ~20 Ω series termination for clean edge integrity. |
| Temperature Range | –40°C to +85°C (industrial grade); validated for sustained operation in network infrastructure and industrial embedded environments. |
Pinout & Package
SL2305SI-1T is housed in an 8-pin SOIC package (150-mil width, RoHS-compliant), with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 marked via notch or bevel; recommended reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CLKIN | Input | Reference clock input with 250 kΩ weak pull-down; detects DC to trigger power-down mode. |
| 2 - CLK2 | Output | Buffered clock output; identical electrical behavior to CLK1/CLK3/CLK4; requires matched trace loading for skew control. |
| 3 - CLK1 | Output | Primary buffered clock output; shares drive strength and timing specs with CLK2–CLK4 and CLKOUT. |
| 4 - GND | Power | Dedicated ground return for internal PLL and output drivers; must be connected to low-impedance system ground plane. |
| 5 - CLK3 | Output | Buffered clock output; used for multi-domain clock fanout where phase coherence across all five outputs is required. |
| 6 - VDD | Power | 3.3 V supply input; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin with minimal trace length. |
| 7 - CLK4 | Output | Buffered clock output; supports same frequency and loading constraints as other outputs; not internally differentiated. |
| 8 - CLKOUT | Output / Feedback | Output used for internal PLL feedback; carries identical signal as other outputs but adds ~2 pF load - critical for zero-delay tuning. |
Key Features
| Feature | Design Value |
|---|---|
| SpreadThru™ PLL | Preserves input SSC modulation profile (spread %, frequency, shape) at all outputs - essential for EMI reduction in DTV and PC platforms. |
| Zero-Delay Tuning | Adjustable input-to-output delay via CLKOUT load capacitance - enables fine-grained phase alignment without external delay lines. |
| Tri-State Power-Down | Entire output bank goes Hi-Z and PLL shuts down when CLKIN is static - eliminates clock feedthrough and reduces system standby power. |
| Industrial Temp Support | Validated operation from –40°C to +85°C with full AC/DC specs - suitable for uncontrolled-environment networking and printing equipment. |
| SOIC-8 Footprint | Drop-in compatible with legacy 8-pin clock buffer layouts; no PCB redesign needed when replacing similar ZDBs in existing industrial designs. |
Applications
| Printers & MFPs | Digital Copiers |
|---|---|
|
Use Scenario: Synchronizing image sensor readout, laser scanning motor control, and USB/Ethernet interface clocks within compact print engines. IC Role / Device Role / Timing Role: Zero-delay clock fanout IC distributing one master oscillator to multiple subsystems while preserving phase alignment. Use Value: Eliminates inter-clock skew-induced timing violations in high-resolution scan line capture and real-time data streaming. |
Use Scenario: Coordinating document feeder timing, CCD/CMOS imaging pipeline, and network stack clocks in standalone copier hardware. IC Role / Device Role / Timing Role: Industrial-grade clock buffer enabling deterministic multi-domain synchronization under variable thermal loads. Use Value: Maintains <150 ps output-to-output skew across –40°C to +85°C, ensuring consistent image registration and page throughput. |
| Routers & Switches | Digital Embedded Systems |
|
Use Scenario: Distributing reference clocks to PHYs, MACs, and management processors in Layer 2/3 switching platforms. IC Role / Device Role / Timing Role: Low-jitter clock repeater supporting 66 MHz Ethernet timing requirements with SSC pass-through capability. Use Value: Enables compliance with FCC Class B EMI limits via SpreadThru™ without sacrificing timing accuracy at PHY interfaces. |
Use Scenario: Providing synchronized clocks to FPGA fabric, ADC/DAC peripherals, and microcontroller subsystems in custom industrial controllers. IC Role / Device Role / Timing Role: Single-supply (3.3 V), low-power ZDB delivering five phase-aligned clocks from one crystal oscillator input. Use Value: Reduces component count vs. discrete buffers and avoids PLL re-lock delays during power-cycle events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zero-delay buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT5V2310APGI | 8-pin TSSOP only; 3.3 V; max 100 MHz; 200 ps c-c jitter; no SpreadThru™; no power-down mode. | Lacks SSC pass-through and DC-detect power-down - unsuitable for EMI-sensitive or low-power standby applications. | Choose only if SpreadThru™ and ultra-low power-down current are not required and TSSOP layout is fixed. |
| ICS552MI-1T | SOIC-8; 3.3 V; max 133 MHz (high-drive); 125 ps c-c jitter; no integrated PLL - relies on external feedback. | Higher max frequency but requires external loop filter and feedback path; no built-in SpreadThru™ or auto power-down. | Select when higher bandwidth (>100 MHz) is needed and board space allows external PLL components. |
Compared with IDT5V2310APGI and ICS552MI-1T, the SL2305SI-1T uniquely combines industrial temperature support, SpreadThru™ SSC pass-through, and sub-25 µA power-down current in a self-contained SOIC-8 ZDB - making it optimal for thermally demanding, EMI-constrained embedded clock trees.
Availability
SL2305SI-1T is available at Aetrix Electronics and suitable for printers and MFPs, digital copiers, and industrial routers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for SL2305SI-1T 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 wireless solutions, with design centers in Austin, TX and global manufacturing partnerships.
The SL2305 product line delivers low-jitter, zero-delay clock distribution ICs optimized for cost-sensitive, thermally varied applications including office automation, networking, and digital consumer electronics.
FAQ
What is the maximum operating frequency of the SL2305SI-1T under standard drive conditions?
The SL2305SI-1T supports up to 100 MHz when driving 30 pF loads, and up to 66 MHz under the same load condition per its standard-drive (-1) specification. This limit is defined by AC timing validation and applies across its full industrial temperature range (–40°C to +85°C). The SL2305SI-1T does not support 140 MHz operation - that capability is exclusive to the high-drive -1H variant.
Does the SL2305SI-1T support spread-spectrum clocking (SSC)?
Yes, the SL2305SI-1T implements SpreadThru™ technology, which passes spread-spectrum modulation - including spread percentage, modulation frequency, and profile - from CLKIN directly to all five outputs without degradation. This feature is confirmed in the device's functional description and supported across its entire 10–100 MHz operating range, making the SL2305SI-1T suitable for FCC-compliant DTV and PC platform designs.
How does the SL2305SI-1T enter power-down mode, and what happens to its outputs?
The SL2305SI-1T enters power-down mode automatically when CLKIN is held static (DC level between 0 V and VDD), detected by internal circuitry. In this state, the PLL shuts down and all five outputs (CLK1–CLK4 and CLKOUT) go into high-impedance (Hi-Z), drawing ≤25 µA supply current. This behavior is specified for industrial-grade operation and is fully characterized - no external control signal is required to activate SL2305SI-1T power-down.
What package type and footprint does the SL2305SI-1T use?
The SL2305SI-1T is supplied in an 8-pin SOIC package (150-mil width, JEDEC MS-012AC compliant) with tape-and-reel packaging ('T' suffix). Its pinout and mechanical dimensions match industry-standard 8-pin clock buffer footprints, enabling drop-in replacement in existing designs without layout changes. Thermal resistance (θJA) is 150°C/W in still air, validated for industrial ambient conditions.
Is the SL2305SI-1T recommended for new designs?
No - Silicon Labs explicitly marks the SL2305SI-1T as "Not Recommended for New Designs" in its official documentation. While fully functional and supported for existing production, designers are advised to evaluate newer alternatives such as the Si5332 or Si534x families for enhanced features, broader frequency range, and extended lifecycle assurance. The SL2305SI-1T remains available for legacy program continuity and repair scenarios.
SL2305SI-1T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- PLL:
- Yes
- Input:
- Clock
- Output:
- LVCMOS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:5
- 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:
- 8-SOIC
SL2305SI-1T FAQ
1.How can I place an order for SL2305SI-1T through Aetrix?
Please submit a Request for Quotation (RFQ) for SL2305SI-1T 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 SL2305SI-1T reliable?
The price and inventory of SL2305SI-1T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SL2305SI-1T is usually 5 days.
3.What payment methods are accepted for SL2305SI-1T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SL2305SI-1T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SL2305SI-1T?
SL2305SI-1T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SL2305SI-1T 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 SL2305SI-1T?
For technical support, including SL2305SI-1T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SL2305SI-1T requirements.
6.How does Aetrix verify that SL2305SI-1T is sourced from the original manufacturer or authorized distributors?
All SL2305SI-1T 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 SL2305SI-1T meets industry standards.
7.What is the process for return or replacement of SL2305SI-1T?
All SL2305SI-1T units undergo pre-shipment inspection (PSI). If there is an issue with SL2305SI-1T, 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 SL2305SI-1T part is unused and in its original packaging.
Return procedure for SL2305SI-1T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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