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

Skyworks Solutions Inc. SL23EP04SI-2H

Name: SL23EP04SI-2H
Brand: Skyworks Solutions Inc.
SKU: SL23EP04SI-2H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SL23EP04SI-2H

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

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

Datasheet:: SL23EP04SI-2H.pdf

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

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Product details

Overview

SL23EP04SI-2H from Silicon Laboratories is a high-drive, industrial-grade zero delay buffer (ZDB) IC that distributes one reference clock to four low-skew, low-jitter outputs with programmable frequency options (1×, 2×, or ½×). It operates from 2.5V–3.3V, supports up to 220 MHz at 3.3V, delivers 60 ps typical output-to-output skew on same bank, and enters <12 µA power-down mode when CLKIN is DC. It is used in routers, servers, and MFPs for synchronized clock distribution.

For engineers reviewing the SL23EP04SI-2H datasheet, SL23EP04SI-2H pinout, SL23EP04SI-2H application, or SL23EP04SI-2H equivalent, key selection criteria include its 8-pin SOIC package, industrial temperature range (–40°C to +85°C), SpreadThru™ SSC pass-through capability, bank-A/bank-B output configuration flexibility, and verified compatibility with 15 pF load at 220 MHz.

Technical Context

The SL23EP04SI-2H integrates an on-chip PLL with external feedback via FBK pin, enabling true zero-delay operation when FBK is connected to any output. Its dual-bank architecture (CLKA1/CLKA2 and CLKB1/CLKB2) allows independent frequency scaling per bank: Bank-A outputs match CLKIN frequency while Bank-B outputs scale to 2× or ½× depending on configuration.

It implements SpreadThru™ technology to preserve spread-spectrum clocking characteristics end-to-end without degradation in spread percent or modulation frequency. The device uses internal 1.8V regulation for PLL stability and VDD-supplied I/O, supporting both 2.5V and 3.3V operation with drive strength optimized for EMI control and impedance matching.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency Range	10–220 MHz at VDD = 3.3V, CL = 15 pF - enables high-speed clock distribution in servers and telecom gear.
Output-to-Output Skew (Same Bank)	60 ps typical - ensures tight timing alignment across CLKA1/CLKA2 or CLKB1/CLKB2 for synchronous interfaces.
Power Supply Range	2.5V–3.3V - compatible with mixed-voltage system designs and legacy 3.3V or modern 2.5V logic domains.
Power-Down Current	8 µA typical - reduces system standby power when CLKIN is held static (GND/VDD).
Output Drive Strength	High-drive (-H) variant with 28 Ω output impedance at 3.3V - supports faster edge rates and longer trace routing.
Spread Spectrum Pass-Through	Full SSC preservation (spread %, profile, modulation frequency) - maintains EMI reduction benefits across clock tree.
Industrial Temp Range	–40°C to +85°C - qualified for embedded networking and industrial computing environments.

Pinout & Package

SL23EP04SI-2H is housed in an 8-pin SOIC (150 mil) package with gull-wing leads, RoHS-compliant, and rated for industrial temperature operation. Pin 1 is marked with a notch or dot; package dimensions conform to JEDEC MS-012.

Pin/Terminal	Circuit Role	Design Meaning
CLKIN (Pin 1)	Input	Reference clock input with 250 kΩ weak pull-down; accepts DC detection for automatic power-down activation.
CLKA1 (Pin 2)	Output	Bank-A clock output; configured as 1× or 2× CLKIN depending on FBK connection and variant (-2H supports 2×).
CLKA2 (Pin 3)	Output	Bank-A clock output; matches CLKA1 frequency and phase; used for parallel load driving.
GND (Pin 4)	Power	Dedicated ground reference for analog/digital sections; requires local 0.1 µF decoupling capacitor.
CLKB1 (Pin 5)	Output	Bank-B clock output; configurable as 1×, 2×, or ½× CLKIN per Table 1; enables asymmetric clock domain generation.
CLKB2 (Pin 6)	Output	Bank-B clock output; mirrors CLKB1 frequency/phase; supports dual-load fanout within same bank.
VDD (Pin 7)	Power	2.5V–3.3V supply input; powers I/O buffers and internal regulator feeding 1.8V PLL core.
FBK (Pin 8)	Input	PLL feedback input; must be externally connected to one of the four outputs to close control loop and achieve zero delay.

Key Features

Feature	Design Value
SpreadThru™ SSC Pass-Through	Preserves input spread-spectrum modulation intact at all outputs-no added jitter or distortion-enabling EMI-compliant clock trees.
Configurable Output Banks	Bank-A and Bank-B operate independently: SL23EP04SI-2H supports 2× output on Bank-B while Bank-A remains 1×, enabling multi-frequency clock domains from single source.
Low-Power Power-Down Mode	Automatic Hi-Z output state and PLL shutdown when CLKIN is static, drawing only 8 µA typical-critical for energy-sensitive systems.
High-Drive Output Option	28 Ω output impedance at 3.3V improves signal integrity over longer traces and higher capacitive loads, reducing need for external termination.
On-Chip 1.8V PLL Regulation	Stabilizes PLL performance across VDD variation and temperature, maintaining consistent skew, jitter, and lock time regardless of supply fluctuations.

Applications

Router Clock Distribution	Server Memory Interface Timing
Use Scenario: Distributing a 100 MHz system reference clock to multiple PHYs, switch fabric, and management controllers in enterprise routers. IC Role / Device Role / Timing Role: Zero-delay buffer generating four synchronized clocks with sub-100 ps skew to eliminate inter-chip setup/hold violations. Use Value: Enables deterministic packet forwarding latency by aligning clock edges across distributed ASICs without adding propagation delay.	Use Scenario: Driving DDR2/DDR3 memory controller clocks and data strobes in dual-CPU server motherboards. IC Role / Device Role / Timing Role: Fanout buffer delivering matched-phase clocks to memory channels with bank-specific 2× scaling for command/address vs. data paths. Use Value: Supports differential clock routing with minimal skew between CLKA1/CLKA2 and CLKB1/CLKB2, improving memory timing margin by >150 ps.
Multifunction Printer (MFP) Engine Control	Industrial Ethernet Switch Timing
Use Scenario: Synchronizing laser scan motor control, image sensor sampling, and print engine ASICs in high-speed digital copiers. IC Role / Device Role / Timing Role: Industrial-grade ZDB providing robust clock distribution across noisy mechanical subsystems with wide temperature tolerance. Use Value: Maintains <125 ps max device-to-device skew across units in production, ensuring consistent page registration accuracy.	Use Scenario: Generating 125 MHz PHY clocks and 25 MHz management clocks from a single crystal oscillator in DIN-rail mounted switches. IC Role / Device Role / Timing Role: Dual-bank buffer producing 1× and 2× outputs simultaneously to feed different MAC/PHY layers without external dividers. Use Value: Reduces BOM count by eliminating discrete clock dividers and simplifies layout with integrated skew-matched outputs.

Router Clock Distribution

Server Memory Interface Timing

Use Scenario: Distributing a 100 MHz system reference clock to multiple PHYs, switch fabric, and management controllers in enterprise routers.

IC Role / Device Role / Timing Role: Zero-delay buffer generating four synchronized clocks with sub-100 ps skew to eliminate inter-chip setup/hold violations.

Use Value: Enables deterministic packet forwarding latency by aligning clock edges across distributed ASICs without adding propagation delay.

Use Scenario: Driving DDR2/DDR3 memory controller clocks and data strobes in dual-CPU server motherboards.

IC Role / Device Role / Timing Role: Fanout buffer delivering matched-phase clocks to memory channels with bank-specific 2× scaling for command/address vs. data paths.

Use Value: Supports differential clock routing with minimal skew between CLKA1/CLKA2 and CLKB1/CLKB2, improving memory timing margin by >150 ps.

Multifunction Printer (MFP) Engine Control

Industrial Ethernet Switch Timing

Use Scenario: Synchronizing laser scan motor control, image sensor sampling, and print engine ASICs in high-speed digital copiers.

IC Role / Device Role / Timing Role: Industrial-grade ZDB providing robust clock distribution across noisy mechanical subsystems with wide temperature tolerance.

Use Value: Maintains <125 ps max device-to-device skew across units in production, ensuring consistent page registration accuracy.

Use Scenario: Generating 125 MHz PHY clocks and 25 MHz management clocks from a single crystal oscillator in DIN-rail mounted switches.

IC Role / Device Role / Timing Role: Dual-bank buffer producing 1× and 2× outputs simultaneously to feed different MAC/PHY layers without external dividers.

Use Value: Reduces BOM count by eliminating discrete clock dividers and simplifies layout with integrated skew-matched outputs.

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 8T49N241	Integrated fractional-N PLL, programmable via I²C; no external FBK connection required; higher integration but larger QFN package.	Supports dynamic frequency reconfiguration and multi-output phase adjustment-suited for adaptive systems, not fixed-ratio fanout.	Choose IDT 8T49N241 when firmware-controlled clock agility is needed; SL23EP04SI-2H remains optimal for cost-sensitive, fixed-configuration clock trees.
ON Semiconductor NB3N502	Lower max frequency (170 MHz at 3.3V); standard drive only (40 Ω); no SpreadThru™ SSC support; 8-pin SOIC compatible footprint.	Lacks spread-spectrum pass-through and bank-level frequency scaling-limited to basic 1× fanout in noise-sensitive applications.	Select NB3N502 only for non-SSCG designs where 170 MHz ceiling and simpler configuration suffice; SL23EP04SI-2H provides superior EMI control and flexibility.

Compared with IDT 8T49N241 and ON Semi NB3N502, SL23EP04SI-2H uniquely combines industrial temperature rating, SpreadThru™ SSC transparency, and dual-bank frequency scaling in a pin-compatible SOIC package-making it the most direct fit for legacy router/server clock trees requiring zero-delay, low-skew, and EMI compliance without redesign.

Availability

SL23EP04SI-2H is available at Aetrix Electronics and suitable for routers, industrial switches, and multifunction printers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SL23EP04SI-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 is a fabless semiconductor company specializing in timing, MCU, and wireless solutions, headquartered in Austin, Texas, with global design and support infrastructure.

The SL23EP04 family was designed specifically for high-fidelity clock distribution in datacom, telecom, and embedded computing systems-emphasizing low skew, jitter immunity, and spread-spectrum compatibility without sacrificing power efficiency.

FAQ

What is the maximum operating frequency of the SL23EP04SI-2H at 2.5V supply?

The SL23EP04SI-2H supports up to 170 MHz at VDD = 2.5V with CL = 15 pF load, as specified in the I-Grade switching characteristics table. This is lower than its 220 MHz capability at 3.3V due to reduced drive strength and timing margins at lower voltage.

Does the SL23EP04SI-2H support spread-spectrum clocking (SSC)?

Yes, the SL23EP04SI-2H implements SpreadThru™ technology, which passes the full spread-spectrum modulation-including spread percentage, profile, and modulation frequency-from CLKIN to all outputs without degradation, preserving EMI reduction benefits across the clock tree.

How does the FBK pin function in the SL23EP04SI-2H?

The FBK pin is the PLL feedback input and must be connected externally to one of the four output clocks (CLKA1, CLKA2, CLKB1, or CLKB2) to close the control loop. This connection determines whether Bank-A or Bank-B drives the PLL, enabling configuration-dependent frequency scaling per bank.

What happens to outputs when CLKIN is held static on the SL23EP04SI-2H?

When CLKIN is driven DC (GND to VDD), the SL23EP04SI-2H detects this condition and forces all four outputs into high-impedance (Hi-Z) state while shutting down the PLL, reducing supply current to 8 µA typical-enabling low-power idle modes without external control logic.

Is the SL23EP04SI-2H pin-compatible with other variants in the SL23EP04 family?

Yes, all SL23EP04 variants-including SL23EP04SI-2H, SL23EP04SI-2, SL23EP04SC-1H, and others-share identical 8-pin SOIC packaging and pinout. Functional differences (frequency range, drive strength, temperature grade) do not affect physical or electrical pin compatibility.

SL23EP04SI-2H Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

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

Packaging:: Tube

Product Status:: Active

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:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

SL23EP04SI-2H FAQ

1.How can I place an order for SL23EP04SI-2H through Aetrix?

Please submit a Request for Quotation (RFQ) for SL23EP04SI-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 SL23EP04SI-2H reliable?

The price and inventory of SL23EP04SI-2H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SL23EP04SI-2H is usually 5 days.

3.What payment methods are accepted for SL23EP04SI-2H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SL23EP04SI-2H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SL23EP04SI-2H?

SL23EP04SI-2H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SL23EP04SI-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 SL23EP04SI-2H?

For technical support, including SL23EP04SI-2H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SL23EP04SI-2H requirements.

6.How does Aetrix verify that SL23EP04SI-2H is sourced from the original manufacturer or authorized distributors?

All SL23EP04SI-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 SL23EP04SI-2H meets industry standards.

7.What is the process for return or replacement of SL23EP04SI-2H?

All SL23EP04SI-2H units undergo pre-shipment inspection (PSI). If there is an issue with SL23EP04SI-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 SL23EP04SI-2H part is unused and in its original packaging.

Return procedure for SL23EP04SI-2H:

1.Submit a request within 90 days.

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

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