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

Skyworks Solutions Inc. SL23EP04SC-2

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

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Part No.:: SL23EP04SC-2

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

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

Datasheet:: SL23EP04SC-2.pdf

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

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Product details

Overview

SL23EP04SC-2 from Silicon Laboratories is a low-skew, low-jitter, low-power Zero Delay Buffer (ZDB) IC designed for high-speed clock distribution. It accepts one reference input clock and generates four buffered outputs with 1× or ½× frequency options (configurable via FBK pin routing), operates from 2.5V–3.3V, delivers ≤150 ps typical output-to-output skew on same bank, and supports up to 135 MHz at 2.5V/CL=15pF in commercial grade - used in PC motherboard clock trees and network switch timing subsystems.

For engineers reviewing the SL23EP04SC-2 datasheet, SL23EP04SC-2 pinout, SL23EP04SC-2 application, or SL23EP04SC-2 equivalent, key selection criteria include its 8-pin SOIC package, dual-bank (A/B) 2-output architecture, SpreadThru™ SSC pass-through capability, power-down mode (<12 µA), and VDD-dependent frequency limits distinguishing it from -1/-1H/-2H variants.

Technical Context

The SL23EP04SC-2 integrates an on-chip PLL with internal feedback path routed through the FBK pin, enabling zero-input-output delay when FBK is connected to one of the four outputs. Its dual-bank structure (CLKA1/CLKA2 and CLKB1/CLKB2) allows independent load matching per bank to minimize inter-bank skew.

It supports three output frequency modes relative to CLKIN: 1× (Bank-A feedback), ½× (Bank-A feedback with internal divider), or 2× (Bank-B feedback). The -2 suffix denotes standard-drive version with 40 Ω output impedance and 135 MHz max at 2.5V/CL=15pF, distinct from high-drive -2H (28 Ω, 170 MHz) and -1/-1H variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Zero Delay Buffer (ZDB) with integrated PLL and configurable 1×/½× output frequency scaling
Supply Voltage Range	2.5 V to 3.3 V - enables compatibility with both 2.5V and 3.3V logic domains without level shifters
Max Output Frequency (2.5V)	135 MHz at CL = 15 pF - defines maximum usable clock rate in low-voltage commercial applications
Output-to-Output Skew (Same Bank)	≤150 ps typ - ensures tight timing alignment across CLKA1/CLKA2 or CLKB1/CLKB2 for synchronous interfaces
Power-Down Current	8 µA typ - reduces system standby power when CLKIN is DC (GND–VDD)
Output Drive Strength	Standard drive (ROUT = 40 Ω) - balances EMI, rise/fall time (~1.5 ns at 15 pF), and load drive capability
Package	8-pin SOIC (150 mil) - industry-standard footprint compatible with automated PCB assembly

Pinout & Package

SL23EP04SC-2 is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with 150-mil body width, JEDEC MS-012AC compliant, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1: CLKIN	Input	Reference clock input with 250 kΩ weak pull-down; must be AC-coupled or driven with ≥30%–70% duty cycle
2: CLKA1	Output	Bank-A clock output; shares skew and delay characteristics with CLKA2 when identically loaded
3: CLKA2	Output	Bank-A clock output; paired with CLKA1 for low intra-bank skew
4: GND	Power	Dedicated ground reference for analog PLL and digital I/O sections; requires local 0.1 µF decoupling
5: CLKB1	Output	Bank-B clock output; configured for 1× or 2× CLKIN depending on FBK connection point
6: CLKB2	Output	Bank-B clock output; mirrors CLKB1 timing; inter-bank skew minimized by matched FBK loading
7: VDD	Power	2.5V–3.3V supply powering I/O buffers and internal regulator (1.8V PLL core)
8: FBK	Input	PLL feedback input - externally tied to CLKA1/CLKA2/CLKB1/CLKB2 to select frequency mode and adjust input-to-output delay

Key Features

Feature	Design Value
SpreadThru™ SSC Pass-Through	Preserves spread-spectrum modulation profile (%, shape, frequency) from CLKIN to all outputs - critical for EMI reduction in computing platforms
Dual-Bank Output Architecture	Two independent 2-output banks (A/B) enable differential routing, separate load tuning, and flexible frequency scaling (1× or ½× on Bank-A; 1× or 2× on Bank-B)
Configurable Zero-Delay Operation	Input-to-output delay adjusted via FBK pin capacitance - permits fine-tuning of clock phase alignment across multi-chip systems
Low-Power Power-Down Mode	Tri-states all outputs and disables PLL when CLKIN is static (DC), drawing only 8 µA - simplifies power sequencing in sleep-state designs
On-Chip 1.8V PLL Regulator	Stabilizes PLL performance across VDD variation (2.5V–3.3V), ensuring consistent jitter (<150 ps) and skew regardless of supply rail

Applications

PC Motherboard Clock Distribution	Network Switch Timing Subsystem
Use Scenario: Distributing 100 MHz PCIe reference clock to multiple chipset components (PCH, GPU, NIC) on a desktop motherboard. IC Role / Device Role / Timing Role: Zero-delay buffer generating four synchronized copies with matched trace-length routing to minimize skew-induced timing violations. Use Value: Enables simultaneous clocking of heterogeneous peripherals while maintaining <150 ps intra-bank skew and supporting spread-spectrum EMI compliance.	Use Scenario: Providing synchronized 125 MHz clocks to multiple PHYs and MAC controllers in a 1U rack-mounted Ethernet switch. IC Role / Device Role / Timing Role: Low-jitter clock fanout device driving four isolated clock domains with programmable 1×/½× scaling per bank. Use Value: Reduces inter-chip setup/hold margin requirements and eliminates external PLL re-timing stages in multi-lane data paths.
Printer/MFP System Clock Tree	Industrial Embedded Controller
Use Scenario: Delivering 66 MHz system clock and 33 MHz peripheral clock from single oscillator in multifunction printer mainboard. IC Role / Device Role / Timing Role: Configurable ZDB using Bank-A for 1× and Bank-B for ½× outputs to serve CPU and legacy parallel interface simultaneously. Use Value: Eliminates need for discrete dividers or second oscillator, reducing BOM count and board area in cost-sensitive consumer electronics.	Use Scenario: Synchronizing real-time control loop (100 MHz) and communication interface (50 MHz) in an industrial PLC module operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade (-I) variant provides stable skew and jitter over full temperature range with robust power-down behavior during firmware updates. Use Value: Ensures deterministic timing margins in safety-critical motion control loops despite ambient thermal cycling.

PC Motherboard Clock Distribution

Network Switch Timing Subsystem

Use Scenario: Distributing 100 MHz PCIe reference clock to multiple chipset components (PCH, GPU, NIC) on a desktop motherboard.

IC Role / Device Role / Timing Role: Zero-delay buffer generating four synchronized copies with matched trace-length routing to minimize skew-induced timing violations.

Use Value: Enables simultaneous clocking of heterogeneous peripherals while maintaining <150 ps intra-bank skew and supporting spread-spectrum EMI compliance.

Use Scenario: Providing synchronized 125 MHz clocks to multiple PHYs and MAC controllers in a 1U rack-mounted Ethernet switch.

IC Role / Device Role / Timing Role: Low-jitter clock fanout device driving four isolated clock domains with programmable 1×/½× scaling per bank.

Use Value: Reduces inter-chip setup/hold margin requirements and eliminates external PLL re-timing stages in multi-lane data paths.

Printer/MFP System Clock Tree

Industrial Embedded Controller

Use Scenario: Delivering 66 MHz system clock and 33 MHz peripheral clock from single oscillator in multifunction printer mainboard.

IC Role / Device Role / Timing Role: Configurable ZDB using Bank-A for 1× and Bank-B for ½× outputs to serve CPU and legacy parallel interface simultaneously.

Use Value: Eliminates need for discrete dividers or second oscillator, reducing BOM count and board area in cost-sensitive consumer electronics.

Use Scenario: Synchronizing real-time control loop (100 MHz) and communication interface (50 MHz) in an industrial PLC module operating at -40°C to +85°C.

IC Role / Device Role / Timing Role: Industrial-grade (-I) variant provides stable skew and jitter over full temperature range with robust power-down behavior during firmware updates.

Use Value: Ensures deterministic timing margins in safety-critical motion control loops despite ambient thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT 85312AGLFT	5-output, 3.3V-only, no SpreadThru™, higher typical skew (200 ps)	Lacks SSC pass-through; unsuitable for EMI-sensitive computing platforms requiring spread spectrum	Select when >4 outputs needed and SSC is not required; verify layout for higher skew tolerance
ON Semi NB3N502MNR2G	4-output, 2.5V/3.3V, no FBK-configurable frequency scaling, fixed 1× only	Cannot generate ½× or 2× outputs; lacks delay tuning via FBK pin	Choose for simpler clock fanout where frequency flexibility and phase adjustment are unnecessary

Compared with IDT 85312AGLFT and ON Semi NB3N502MNR2G, SL23EP04SC-2 uniquely supports SpreadThru™ SSC preservation and FBK-driven frequency/phase configuration - making it irreplaceable in designs requiring EMI compliance and adaptive clock tree tuning.

Availability

SL23EP04SC-2 is available at Aetrix Electronics and suitable for PC motherboard clock distribution, network switch timing subsystems, printer/MFP system clock trees, and industrial embedded controller applications requiring stable component supply and long-term lifecycle support.

Supply support for SL23EP04SC-2 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, Texas, specializing in timing, wireless, and sensor solutions for IoT, communications, and industrial markets.

The SL23EP04 family was developed to address high-speed, low-skew clock distribution needs in computing and networking equipment - emphasizing zero-delay operation, SSC compatibility, and flexible frequency scaling within compact SOIC packages.

FAQ

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

The SL23EP04SC-2 supports up to 135 MHz at 2.5V with 15 pF load capacitance in commercial temperature grade (0°C to +70°C). This limit drops to 100 MHz at 30 pF load and further to 75 MHz under industrial conditions (-40°C to +85°C) per datasheet Table FOUT6. Exceeding these values risks timing violations and increased jitter.

How does the FBK pin configure SL23EP04SC-2 output frequency?

The FBK pin selects SL23EP04SC-2 output frequency mode: connecting FBK to CLKA1/CLKA2 configures Bank-A for 1× output and Bank-B for ½×; connecting FBK to CLKB1/CLKB2 configures Bank-B for 2× and Bank-A for 1×. This hardware-selectable scaling eliminates need for external configuration pins or registers.

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

Yes, SL23EP04SC-2 implements SpreadThru™ technology that preserves the exact spread percentage, modulation frequency, and profile from CLKIN to all four outputs without degradation - a key differentiator for EMI-sensitive applications like PCs and servers where SSC compliance is mandatory.

What happens to SL23EP04SC-2 outputs when CLKIN is held static?

When CLKIN is DC (GND to VDD), SL23EP04SC-2 automatically enters power-down mode: all four outputs go high-impedance (Hi-Z), the internal PLL shuts off, and supply current drops to 8 µA typical. This behavior is intrinsic and requires no external control signal.

Is SL23EP04SC-2 pin-compatible with SL23EP04SC-1 or SL23EP04SC-2H?

No - while all share the same 8-pin SOIC package and pinout, SL23EP04SC-2 differs electrically from SL23EP04SC-1 (higher 167 MHz max at 3.3V) and SL23EP04SC-2H (lower 28 Ω output impedance, 170 MHz max at 2.5V). Direct substitution may cause timing or drive strength mismatches; verify frequency, load, and skew requirements before replacement.

SL23EP04SC-2 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-2 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SL23EP04SC-2?

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

Once your SL23EP04SC-2 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-2?

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

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

All SL23EP04SC-2 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-2 meets industry standards.

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

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

Return procedure for SL23EP04SC-2:

1.Submit a request within 90 days.

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

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