Clock Buffers

Product Specifications

Technical details and manufacturing context for Clock Buffers

Definition

Clock buffers are specialized integrated circuits used in clock management circuits. They receive a reference clock signal and generate multiple synchronized output signals with minimal skew and jitter. Their primary function is to isolate the clock source from downstream loads, preventing signal degradation over long traces or multiple branches, and ensuring precise timing distribution across digital systems such as processors, FPGAs, and memory interfaces. These components are essential in high-speed digital designs where timing accuracy is critical. They operate by amplifying the input clock signal to drive multiple outputs, using internal circuitry like phase-locked loops (PLLs) or delay-locked loops (DLLs) to minimize output-to-output skew and phase errors. Features often include fanout buffering, signal level translation, and programmable delays to adapt to various system requirements. Typical parameters include a supply voltage range of 1.8–3.3 V, output frequency range of 1–200 MHz, output skew of ≤50 ps, additive phase jitter of ≤0.1 ps RMS, differential output voltage of 0.7–1.0 V, input capacitance of 1.5–3.0 pF, operating temperature range of -40 to 85 °C, supply current of 10–50 mA, output impedance of 50 Ω, and package types such as QFN, SOIC, and TSSOP. ESD protection is ±2 kV HBM per IEC 61340-3-1, and RoHS compliance is indicated per EU Directive 2011/65/EU. These values are reference ranges and must be verified for the specific model and application. Always consult the manufacturer's datasheet for exact specifications and confirm compliance with relevant standards.

Working Principle

Clock buffers receive an input clock signal and amplify it to drive multiple outputs. Internal circuitry, such as PLLs or DLLs, aligns the output phases to minimize skew and jitter. They provide fanout buffering to isolate the source from load variations, and may include level translation and programmable delays. The buffer ensures that all downstream devices receive a clean, synchronized clock, maintaining signal integrity across the system.

Common Materials

Silicon

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	1.8–3.3 V	Operating range for core logic; outside may cause malfunction.
Output Frequency Range	1–200 MHz	Maximum frequency depends on fan-out and load capacitance.
Output Skew	≤ 50 ps	Skew between outputs; lower is better for timing margin.
Additive Phase Jitter	≤ 0.1 ps RMS	Jitter added by the buffer; critical for high-speed serial links.
Differential Output Voltage	0.7–1.0 V	Peak-to-peak for LVDS or LVPECL outputs.
Input Capacitance	1.5–3.0 pF	Affects input loading and signal integrity.
Operating Temperature Range	-40–85 °C	Industrial grade; extended range may be available.
Supply Current	10–50 mA	Depends on output frequency and load.
Output Impedance	50 Ω	Matched to transmission line for signal integrity.
Package Type	QFN, SOIC, TSSOP	Surface-mount packages; footprint varies by type.
ESD Protection	±2 kV HBM	Human body model; ensures robustness in handling.IEC 61340-3-1
RoHS Compliance	Yes	Lead-free and hazardous substance free.EU Directive 2011/65/EU

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Input Buffer Stage Part
Receives and conditions the input clock signal.

Material: Silicon
Output Driver Stage
Amplifies and drives multiple output clock signals.

Material: Silicon
Control Logic
Manages programmable features like delay, enable/disable, and output configuration.

Material: Silicon
PLLs Optional
Align the output clock phases to minimise skew and jitter.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Clock Buffers.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Clock Management Circuit

View system integration details

Manufacturers of Clock Buffers

Manufacturer profiles associated with Clock Buffers.

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Frequently Asked Questions

What is the primary function of a clock buffer?

A clock buffer receives a reference clock signal and generates multiple synchronized output signals with minimal skew and jitter, isolating the source from downstream loads and ensuring precise timing distribution.

What are typical supply voltage and frequency ranges?

Typical supply voltage is 1.8–3.3 V, and output frequency range is 1–200 MHz, but these are reference ranges; check the specific model's datasheet.

How does a clock buffer reduce skew and jitter?

It uses internal PLLs or DLLs to align output phases, minimizing output-to-output skew and additive jitter, which is critical for high-speed interfaces.

What standards apply to clock buffers?

ESD protection is rated per IEC 61340-3-1, and RoHS compliance is per EU Directive 2011/65/EU. Verify actual compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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jitter:	< 100 fs RMS (phase noise performance)
voltage:	1.2V to 3.3V (supply voltage range)
frequency:	Up to 2.5 GHz (maximum operating frequency)
temperature:	-40°C to +125°C (operating range)

Product Specifications

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Industrial Ecosystem & Supply Chain Structure

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