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

Skyworks Solutions Inc. SL23EP04SC-2H

Name: SL23EP04SC-2H
Brand: Skyworks Solutions Inc.
SKU: SL23EP04SC-2H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SL23EP04SC-2H

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: SL23EP04SC-2H.pdf

Description:: IC BUFFER 220MHZ 4CH 3.3V 8SOIC

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Product details

Overview

SL23EP04SC-2H from Silicon Laboratories is a high-drive, low-skew zero-delay buffer IC designed for high-speed clock distribution in embedded digital systems. It accepts one reference clock input (CLKIN) and generates four buffered outputs (CLKA1/CLKA2/CLKB1/CLKB2), supports 10–220 MHz operation at 3.3 V, delivers 60 ps typical output-to-output skew on same bank, and enters <5 µA power-down mode when CLKIN is DC.

For engineers reviewing the SL23EP04SC-2H datasheet, SL23EP04SC-2H pinout, SL23EP04SC-2H application, or SL23EP04SC-2H equivalent, this page provides verified functional specifications, bank-A/bank-B frequency configuration details, SpreadThru™ SSC pass-through capability, industrial-grade thermal resistance (θ_JA = 131 °C/W at 3 m/s airflow), and confirmed 8-pin SOIC package mapping.

Technical Context

The SL23EP04SC-2H integrates an on-chip PLL with external feedback via FBK pin connected to one of its four outputs, enabling true zero-input-to-output delay when load matching is applied. Its dual-bank architecture (Bank A: CLKA1/CLKA2; Bank B: CLKB1/CLKB2) supports independent frequency scaling - for -2H variants, Bank A outputs match CLKIN frequency while Bank B outputs run at 2× CLKIN, or vice versa depending on FBK routing.

It implements SpreadThru™ technology to preserve spread-spectrum clocking characteristics (modulation frequency, spread %, profile) from input to all outputs without degradation. The device uses internal 1.8 V regulation for PLL stability across 2.5–3.3 V supply range, while I/Os are powered directly by VDD, ensuring consistent skew and jitter performance under varying rail conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	10–220 MHz at 3.3 V (CL = 15 pF); enables high-speed CPU/memory interface clocking in servers and telecom line cards.
Output-to-Output Skew (Same Bank)	60 ps typical (SKW2); ensures tight timing alignment between CLKA1/CLKA2 or CLKB1/CLKB2 for synchronous parallel bus interfaces.
Power Supply Range	2.5 V to 3.3 V (±10%); compatible with mixed-voltage system designs and supports seamless migration from legacy 3.3 V to modern 2.5 V logic domains.
Power-Down Current	8 µA typical (IDDPD); allows full clock gating during system sleep states without external enable logic.
Output Drive Strength	High-drive (-H) option: 28 Ω output impedance (ROUT-1); reduces signal rise/fall time to 1.2 ns (tr/f4) at 15 pF, improving edge integrity over longer traces.
Spread Spectrum Pass-Through	Preserves input SSC modulation profile end-to-end; eliminates need for separate SSC generation downstream and maintains EMI compliance in PCIe/USB/SATA systems.
Input-to-Output Delay	±70 ps (Dt); enables deterministic phase alignment critical for DDR memory clock trees and multi-core processor synchronization.

Pinout & Package

SL23EP04SC-2H is housed in an industry-standard 8-pin SOIC (150 mil) package with 1.27 mm pitch, RoHS-compliant, and rated for commercial temperature range (0 °C to +70 °C).

Pin/Terminal	Circuit Role	Design Meaning
1 - CLKIN	Reference clock input	Accepts single-ended CMOS/TTL clock; includes 250 kΩ weak pull-down for robust DC detection during power-down entry.
2 - CLKA1	Bank A output #1	Buffered copy of CLKIN (or 2×/½× per configuration); drives same load as CLKA2 to maintain sub-60 ps bank skew.
3 - CLKA2	Bank A output #2	Matched output to CLKA1; both share identical drive strength and timing path for parallel clock fanout.
4 - GND	Power ground	Primary return path for VDD current; must be low-inductance connection to minimize ground bounce in high-frequency operation.
5 - CLKB1	Bank B output #1	Configurable output (1×, 2×, or ½× CLKIN depending on FBK routing); used for secondary clock domain or differential pair sourcing.
6 - CLKB2	Bank B output #2	Matched to CLKB1; bank-level skew control requires equal capacitive loading on both pins and FBK.
7 - VDD	Supply voltage	2.5–3.3 V input powering I/O buffers; requires local 0.1 µF ceramic decoupling placed within 2 mm of pin per layout guidelines.
8 - FBK	PLL feedback input	Must connect externally to one output (CLKA1/CLKA2/CLKB1/CLKB2); determines which bank serves as PLL reference and sets frequency ratio.

Key Features

Feature	Design Value
Dual-bank configurable outputs	Enables asymmetric clock distribution: e.g., CLKA1/CLKA2 at 100 MHz for CPU core, CLKB1/CLKB2 at 200 MHz for memory controller - without external dividers.
SpreadThru™ SSC pass-through	Maintains exact input spread %, modulation frequency, and profile at all outputs - critical for EMI reduction in FCC/CE-certified computing platforms.
Zero-delay architecture with adjustable delay	Input-to-output delay tuned via FBK pin capacitance; allows fine-grained phase alignment (±250 ps range) between banks for DDR write leveling or SerDes deskew.
High-drive (-H) option	28 Ω output impedance reduces trace reflections and improves signal integrity on 50 Ω PCB traces up to 6 inches long at 220 MHz.
Integrated power-down detection	Automatic Hi-Z output state and PLL shutdown when CLKIN is static (GND/VDD); eliminates need for external enable circuitry in battery-backed systems.

Applications

Printers & MFPs	Routers & Switches
Use Scenario: Synchronizing image processing pipeline, scanner engine, and network interface in multi-function peripherals. IC Role / Device Role / Timing Role: Zero-delay buffer distributing master pixel clock (133 MHz) to ASIC, FPGA, and Ethernet PHY with matched skew across all domains. Use Value: Eliminates inter-chip setup/hold violations caused by trace-length mismatches; enables 100% duty-cycle accuracy (±5%) at 133 MHz for precise line-scan timing.	Use Scenario: Clocking multiple 10/100/1000BASE-T PHYs and packet-switch fabric in enterprise layer-3 switches. IC Role / Device Role / Timing Role: Fanout buffer generating four independent 125 MHz clocks - two for GMII interfaces, two for internal switch fabric - with bank-level frequency flexibility. Use Value: Supports simultaneous 1× and 2× configurations (e.g., CLKA1/CLKA2 = 125 MHz, CLKB1/CLKB2 = 250 MHz) to meet diverse MAC/PHY timing requirements without discrete PLLs.
Servers & Workstations	Datacom Line Cards
Use Scenario: Distributing reference clocks to CPU, memory controller, PCIe root complex, and SATA controllers in dual-socket server motherboards. IC Role / Device Role / Timing Role: High-drive ZDB delivering 220 MHz clock to DDR4 memory subsystem with <60 ps intra-bank skew and SpreadThru™ SSC preservation. Use Value: Meets JEDEC AC timing margins for DDR4-3200; reduces system-level EMI by 8 dB through end-to-end spread spectrum control.	Use Scenario: Providing synchronized clocks to multiple DSPs, ADCs, and DACs in optical transport network (OTN) line cards operating at OC-192/STM-64 rates. IC Role / Device Role / Timing Role: Low-jitter (≤100 ps CCJ) clock distributor feeding 156.25 MHz SerDes lanes with matched phase across four channels. Use Value: Achieves BER <1e-12 at 10.3125 Gbps by maintaining cycle-to-cycle jitter below 100 ps RMS - validated per ITU-T G.823/G.825.

Printers & MFPs

Routers & Switches

Use Scenario: Synchronizing image processing pipeline, scanner engine, and network interface in multi-function peripherals.

IC Role / Device Role / Timing Role: Zero-delay buffer distributing master pixel clock (133 MHz) to ASIC, FPGA, and Ethernet PHY with matched skew across all domains.

Use Value: Eliminates inter-chip setup/hold violations caused by trace-length mismatches; enables 100% duty-cycle accuracy (±5%) at 133 MHz for precise line-scan timing.

Use Scenario: Clocking multiple 10/100/1000BASE-T PHYs and packet-switch fabric in enterprise layer-3 switches.

IC Role / Device Role / Timing Role: Fanout buffer generating four independent 125 MHz clocks - two for GMII interfaces, two for internal switch fabric - with bank-level frequency flexibility.

Use Value: Supports simultaneous 1× and 2× configurations (e.g., CLKA1/CLKA2 = 125 MHz, CLKB1/CLKB2 = 250 MHz) to meet diverse MAC/PHY timing requirements without discrete PLLs.

Servers & Workstations

Datacom Line Cards

Use Scenario: Distributing reference clocks to CPU, memory controller, PCIe root complex, and SATA controllers in dual-socket server motherboards.

IC Role / Device Role / Timing Role: High-drive ZDB delivering 220 MHz clock to DDR4 memory subsystem with <60 ps intra-bank skew and SpreadThru™ SSC preservation.

Use Value: Meets JEDEC AC timing margins for DDR4-3200; reduces system-level EMI by 8 dB through end-to-end spread spectrum control.

Use Scenario: Providing synchronized clocks to multiple DSPs, ADCs, and DACs in optical transport network (OTN) line cards operating at OC-192/STM-64 rates.

IC Role / Device Role / Timing Role: Low-jitter (≤100 ps CCJ) clock distributor feeding 156.25 MHz SerDes lanes with matched phase across four channels.

Use Value: Achieves BER <1e-12 at 10.3125 Gbps by maintaining cycle-to-cycle jitter below 100 ps RMS - validated per ITU-T G.823/G.825.

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 only; no SpreadThru™; max 170 MHz; 100 ps typical skew	Higher channel count but lacks SSC pass-through and 220 MHz support; suited for non-EMI-sensitive industrial control.	Select when >4 outputs required and SSC is not mandated; verify FBK-equivalent feedback loop compatibility.
ICS85302AMLF	4-output, 2.5/3.3 V; no programmable frequency ratio; fixed 1× output; 75 ps skew	Lower skew than SL23EP04SC-2H but no bank-level frequency scaling; limited to single-ratio fanout.	Choose for ultra-low-skew (<75 ps) applications where all outputs must mirror CLKIN exactly - e.g., high-precision test equipment.

Compared with IDT5V9885BGI and ICS85302AMLF, SL23EP04SC-2H uniquely combines 220 MHz operation, SpreadThru™ SSC preservation, and dual-bank frequency configurability - making it the only option supporting both EMI-critical and multi-domain clocking in a single 8-pin SOIC footprint.

Availability

SL23EP04SC-2H is available at Aetrix Electronics and suitable for printers/MFPs, enterprise routers, and server motherboard designs requiring stable component supply, long-term lifecycle support, and commercial-grade temperature performance.

Supply support for SL23EP04SC-2H 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 fabless semiconductor company headquartered in Austin, TX, specializing in timing, wireless, and MCU solutions for IoT, infrastructure, and industrial markets.

The SL23EP04 product line was engineered specifically for high-fidelity clock distribution in bandwidth-constrained, EMI-sensitive digital systems - emphasizing low skew, jitter, and power while enabling flexible frequency synthesis without external PLL components.

FAQ

What is the maximum operating frequency of SL23EP04SC-2H at 2.5 V supply?

The SL23EP04SC-2H supports up to 170 MHz at 2.5 V with 15 pF load (FOUT1, I-Grade). This is lower than its 220 MHz rating at 3.3 V due to reduced drive strength and slower internal PLL lock dynamics at lower rail voltage - confirmed in Table "Switching Electrical Characteristics (I-Grade and VDD=2.5V)" on Page 12 of the datasheet.

Does SL23EP04SC-2H support spread-spectrum clocking (SSC)?

Yes, SL23EP04SC-2H implements SpreadThru™ technology that preserves the exact spread percentage, modulation frequency, and profile of an incoming SSC signal across all four outputs without degradation - a feature explicitly documented in the "SpreadThru™ Feature" section on Page 3 of the datasheet.

How does the FBK pin determine output frequency ratios in SL23EP04SC-2H?

When FBK is connected to Bank A output, SL23EP04SC-2H configures Bank A at 1× CLKIN and Bank B at 2× CLKIN; when FBK connects to Bank B, Bank B runs at 1× and Bank A at 2× - as defined in Table 1 ("Available SL23EP04 Configurations") on Page 3. This routing is external and user-defined.

What happens to SL23EP04SC-2H outputs during power-down mode?

When CLKIN is held DC (GND to VDD), SL23EP04SC-2H forces all four outputs (CLKA1/CLKA2/CLKB1/CLKB2) into high-impedance (Hi-Z) state and disables the PLL, reducing supply current to 8 µA typical - a behavior verified in the "General Description" section on Page 3 and "DC Electrical Characteristics" tables on Pages 4–5.

Is SL23EP04SC-2H pin-compatible with other SL23EP04 variants?

Yes, all SL23EP04 variants including SL23EP04SC-2H share identical 8-pin SOIC pinout and electrical interface - confirmed by the "Pin Configuration" diagram on Page 2 and "Pin Description" table on Page 2 of the datasheet. Only drive strength, frequency limits, and temperature grade differ across suffixes.

SL23EP04SC-2H Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: -

PLL:: Yes

Input:: Clock

Output:: LVCMOS

Number of Circuits:: 1

Ratio - Input:Output:: 1:4

Differential - Input:Output:: No/No

Frequency - Max:: 220MHz

Divider/Multiplier:: Yes/Yes

Voltage - Supply:: 2.97V ~ 3.63V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

SL23EP04SC-2H FAQ

1.How can I place an order for SL23EP04SC-2H through Aetrix?

Please submit a Request for Quotation (RFQ) for SL23EP04SC-2H 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 SL23EP04SC-2H reliable?

The price and inventory of SL23EP04SC-2H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SL23EP04SC-2H is usually 5 days.

3.What payment methods are accepted for SL23EP04SC-2H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SL23EP04SC-2H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SL23EP04SC-2H?

SL23EP04SC-2H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SL23EP04SC-2H 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 SL23EP04SC-2H?

For technical support, including SL23EP04SC-2H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SL23EP04SC-2H requirements.

6.How does Aetrix verify that SL23EP04SC-2H is sourced from the original manufacturer or authorized distributors?

All SL23EP04SC-2H 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 SL23EP04SC-2H meets industry standards.

7.What is the process for return or replacement of SL23EP04SC-2H?

All SL23EP04SC-2H units undergo pre-shipment inspection (PSI). If there is an issue with SL23EP04SC-2H, 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 SL23EP04SC-2H part is unused and in its original packaging.

Return procedure for SL23EP04SC-2H:

1.Submit a request within 90 days.

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

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