PCI Express® Clocks

Industry-leading PCI Express Clock Solutions

Renesas has been first to market in PCI Express clocking and timing since its inception:

PCIe Gen1, Gen2, Gen3, Gen4, Gen5, Gen6 clocking solutions
Very-low power PCI Express clock generator (1.8V/1.5V)
Ultra-low power HCSL (LP-HCSL) outputs (power savings up to 85% vs. standard HCSL outputs)
Multi-PLL clock generators

With expertise with leading CPU platforms, Renesas is in the optimal position to support all your design needs for processor clocking from personal PCs to data centers and cloud servers. Find your ideal PCIe timing solutions.

Renesas recognizes how challenging it is to balance the system needs of tightening jitter limits, restrictive BOM costs, and shrinking board space. Our clocks support diverse requirements including PCI Express, SATA, USB, SAS, DMI, QPI, Hypertransport, Ethernet, etc., and multiple socket CPU architectures.

About PCI Express Clocks

PCI Express is one of the most widely used high-performance peripheral interfaces in the world. From its origins in graphics, fields as diverse as high-performance computing, servers, storage, networking, and instrumentation have adopted PCI Express. This broad application space requires multiple PCI Express clock solutions optimized for the performance/BOM cost/board-space tradeoffs of each application. Renesas' strong partnerships with leading computing, networking, and consumer vendors and our participation in the appropriate standards bodies enable us to stay at the forefront of the market with the ideal PCI Express clock and timing solutions (PCIe clocks) for every application.

Three Basic PCIe Reference Clock Architectures

CC Architecture

Common Clock

SRnS Architecture

Separate Reference No Spread

SRIS Architecture

Separate Reference Independent Spread

Clock Gen

Clock

Buffer
(optional)

CPU/SoC

PCIe
Data

PCIe Device

CPU/SoC

PCIe
Data

PCIe Device

CPU/SoC

PCIe
Data

PCIe Device

Product Selection Table

Processing table

	Function	Architecture	App Jitter Compliance	Diff. Outputs	Diff. Output Signaling	Output Impedance	Diff. Inputs	Power Consumption Typ (mW)	Supply Voltage (V)	Advanced Features	Lead Count (#)	Pkg. Type	Pkg. Dimensions (mm)
(23) Featured Products (132) Additional Products	Fanout Buffer Generator Multiplexer Zero Delay Buffer	Common SRIS SRNS	10GbE 25G EDR DB2000Q IF-UPI PCIe Gen1 PCIe Gen2 PCIe Gen3 PCIe Gen4 PCIe Gen5 PCIe Gen6 QPI RXAUI UPI USB 3.0 XAUI	1 2 4 5 6 7 8 9 11 12 13 15 16 19 20 24	HCSL LP-HCSL LVCMOS LVDS LVPECL	33 85 100	1 2 4	Maximum Typical power consumption (in mW). Minimum Typical power consumption (in mW).	1.05 - 1.5 1.05 - 3.3 1.5 1.8 1.8 - 3.3 2.5 2.5 - 3.3 3.3	100M output(s) 100MHz output(s) 125M output(s) 14.318M output(s) 156.25M output(s) 200MHz Differential LVDS 250M output(s) 25M output(s) 25MHz output(s) 312.5M output(s) 33MHz or 48MHz 48M output(s) 50M output(s) Asynch or Glitch-Free Switching Mode Auto SRIS Mode Automatic Clock Parking DOT96M output pair(s) Flexible Power Sequencing Flexible Startup Sequencing HW PLL mode control Integrated 25MHz XTAL Loss of Signal Indicator Multiple SMBus addresses PFT Power Down Tolerant Programmable Clock Programmable input-to-output skew Reference Output SMBus Write Protection SMBus Write lock SMBus security SW PLL mode control Selectable Output Amplitude Selectable Output Impedance Side Band interface Spread Spectrum Very Low Additive Jitter	8 16 20 24 28 32 40 48 56 64 72 80 100	LGA SOIC SSOP TSSOP VFQFPN	10.0 x 10.0 x 1.0 10.2 x 5.3 x 1.73 12.5 x 6.1 x 1.0 15.9 x 7.5 x 2.3 17.0 x 6.1 x 1.0 3.0 x 3.0 x 1.0 3.0 x 3.0 x 1.1 4.0 x 4.0 x 0.8 4.0 x 4.0 x 0.9 4.0 x 4.0 x 1.0 4.0 x 4.0 x 1.21 4.0 x 4.0 x 1.4 4.9 x 3.9 x 1.5 5.0 x 4.4 x 1.0 5.0 x 5.0 x 0.9 6 x 6 x 0.85 6.0 x 6.0 x 0.85 6.0 x 6.0 x 0.9 6.5 x 4.4 x 1.0 7.0 x 7.0 x 0.9 7.0 x 7.0 x 1.0 7.8 x 4.4 x 1.0 8.0 x 8.0 x 0.55 9.0 x 9.0 x 0.9 9.7 x 4.4 x 1.0
Part Number	Logical Operator	Logical Operator	Logical Operator	Logical Operator	Logical Operator	Logical Operator	Logical Operator		Logical Operator	Logical Operator	Logical Operator	Logical Operator	Logical Operator
9SQ440 PDF CK440Q PCIe Gen6 Server Clock Generator	Generator	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	20	LP-HCSL	85		875	3.3	25MHz output(s), 100MHz output(s), PFT, Spread Spectrum	100	VFQFPN	8.0 x 8.0 x 0.55
RC19208 PDF PCIe Gen6 2:8 Clock Multiplexer	Multiplexer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	8	LP-HCSL	85, 100	2	250	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	48	VFQFPN	6.0 x 6.0 x 0.9
RC19204 PDF PCIe Gen6 2:4 Clock Multiplexer	Multiplexer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	4	LP-HCSL	85, 100	2	92	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	28	VFQFPN	4.0 x 4.0 x 0.9
RC19202 PDF PCIe Gen6 2:2 Clock Multiplexer	Multiplexer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	2	LP-HCSL	85, 100	2	72	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	20	VFQFPN	3.0 x 3.0 x 1.0
RC19024 PDF PCIe Gen6 24-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	24	LP-HCSL	85	1	808	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	100	VFQFPN	8.0 x 8.0 x 0.55
RC19020 PDF PCIe Gen6 20-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	20	LP-HCSL	85	1	716	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	72, 80	VFQFPN	6.0 x 6.0 x 0.85, 10.0 x 10.0 x 1.0
RC19016 PDF PCIe Gen6 16-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	16	LP-HCSL	85, 100	1	508, 498	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	64	VFQFPN	9.0 x 9.0 x 0.9
RC19013 PDF PCIe Gen6 13-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	13	LP-HCSL	85, 100	1	363, 320	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	56	VFQFPN	7.0 x 7.0 x 1.0
RC19008 PDF PCIe Gen6 8-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	8	LP-HCSL	85, 100	1	237, 231	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	40	VFQFPN	5.0 x 5.0 x 0.9
RC19004 PDF PCIe Gen6 4-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	4	LP-HCSL	85, 100	1	128, 125	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	28	VFQFPN	4.0 x 4.0 x 0.9
RC19002 PDF PCIe Gen6 2-Output Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	2	LP-HCSL	85, 100	1	72	3.3	Automatic Clock Parking, Flexible Startup Sequencing and more...	20	VFQFPN	3.0 x 3.0 x 1.0
RC19216 PDF PCIe Gen6 2:16 Clock Multiplexer	Multiplexer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	16	LP-HCSL	85, 100	2	534	3.3	Automatic Clock Parking, Flexible Power Sequencing and more...	80	VFQFPN	6.0 x 6.0 x 0.85
5P35021 PDF VersaClock® 3S Programmable Clock Generator	Generator	Common	PCIe Gen1, PCIe Gen2, PCIe Gen3	2	LP-HCSL, LVCMOS, LVDS, LVPECL	100		50	1.8, 2.5, 3.3	Programmable Clock, Reference Output, Spread Spectrum	20	VFQFPN	3.0 x 3.0 x 1.0
5P35023 PDF VersaClock® 3S Programmable Clock Generator	Generator	Common	PCIe Gen1, PCIe Gen2, PCIe Gen3	2	LP-HCSL, LVCMOS, LVDS, LVPECL	100		50	1.8, 2.5, 3.3	Programmable Clock, Reference Output, Spread Spectrum	24	VFQFPN	4.0 x 4.0 x 0.9
5P49V6965 PDF VersaClock® 6E Programmable Clock Generator	Generator	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5	4	HCSL, LVCMOS, LVDS, LVPECL	100		100	1.8, 2.5, 3.3	Programmable Clock, Reference Output, Spread Spectrum	24	VFQFPN	4.0 x 4.0 x 0.9
9DML4493 PDF 4:4 Clock MUX for PCI Express Gen1–6	Multiplexer	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	4	LP-HCSL	85, 100	4	124	3.3, 2.5, 1.8	Selectable Output Amplitude, Selectable Output Impedance and more...	32	VFQFPN	5.0 x 5.0 x 0.9
9FGV1002 PDF Programmable PhiClock™ Generator	Generator	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	4	LP-HCSL, LVDS	85, 100		125	3.3, 1.8	Programmable Clock	24	LGA, VFQFPN	4.0 x 4.0 x 0.8, 4.0 x 4.0 x 1.4
9FGV1006 PDF Programmable PhiClock™ Generator	Generator	Common, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	2	LP-HCSL	85, 100		100	3.3, 1.8	Programmable Clock	16	LGA	3.0 x 3.0 x 1.1
9QXL2000B PDF 20-Output DB2000Q PCIe Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	25G EDR, DB2000Q, IF-UPI, PCIe Gen1, PCIe Gen2, PCIe Gen3 and more...	20	LP-HCSL	85	1	594	3.3	Multiple SMBus addresses	72	VFQFPN	10.0 x 10.0 x 1.0
9QXL2000C PDF 20-Output Enhanced DB2000Q PCIe Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	25G EDR, DB2000Q, IF-UPI, PCIe Gen1, PCIe Gen2, PCIe Gen3 and more...	20	LP-HCSL	85	1	739	3.3	Multiple SMBus addresses	72	VFQFPN	10.0 x 10.0 x 1.0
9QXL2001B PDF 20-Output DB2000QL PCIe Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	25G EDR, DB2000Q, IF-UPI, PCIe Gen1, PCIe Gen2, PCIe Gen3 and more...	20	LP-HCSL	85	1	488	3.3	Multiple SMBus addresses, Side Band interface	80	VFQFPN	6.0 x 6.0 x 0.85
9QXL2001C PDF 20-Output Enhanced DB2000QL PCIe Clock Buffer	Fanout Buffer	Common, SRIS, SRNS	25G EDR, DB2000Q, IF-UPI, PCIe Gen1, PCIe Gen2, PCIe Gen3 and more...	20	LP-HCSL	85	1	720	3.3	Multiple SMBus addresses, Side Band interface	80	VFQFPN	6 x 6 x 0.85, 6.0 x 6.0 x 0.85
9SQ445 PDF CK440Q Lite PCIe Gen6 Server Clock Generator	Generator	Common, SRIS, SRNS	PCIe Gen1, PCIe Gen2, PCIe Gen3, PCIe Gen4, PCIe Gen5, PCIe Gen6	6	LP-HCSL	85	1	400	3.3	25MHz output(s), 100MHz output(s), PFT, Spread Spectrum	40	VFQFPN	5.0 x 5.0 x 0.9

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Documentation

Title	Type	Date
Timing Solutions Products Overview PDF 872 KB	Overview	Feb 1, 2023
PCI Express Timing Solutions Overview PDF 2.40 MB	Overview	Apr 8, 2022
Clock Distribution Overview PDF 217 KB	Overview	Nov 7, 2020
PCIe Reference Clock Jitter Measurements for Gen5 and Beyond PDF 1.35 MB	White Paper	Aug 5, 2020
4 items

Videos & Training

PCIe Gen 6 RC19 Family Clock Buffer and Multiplexer Overview

The RC family are PCIe Gen6 clock buffer and multiplexer solutions provide industry's smallest and most compact footprint.

Video List

PCIe Gen 6 RC19 Family Clock Buffer and Multiplexer Overview

Comparing PCI Express® Gen 3-6 Jitter Filters to a 12k-20M Jitter Filter

PCIe Reference Clock Jitter Budgets

What Does PCIe Gen5 Say About SRIS?

PCIe Data Rates vs Clock Jitter Specs

IDT PhiClock™ PCIe Gen 4 Clock Generators, 9FGV100x Family

PCIe Gen5 Clock Buffers

Generating a PCIe Gen 4 Compliant Reference Clock from a Gen 3 Source Using the 9ZXL1951D

PCI Express Gen 1 to Gen 4/Gen 5 Data Rate Evolution

PCI Express Gen 1 to Gen 4/Gen 5 Clock Specification Evolution

PCI Express Common Clock Jitter Model and Transfer Functions

News & Blog Posts

Future-proof Your PCIe® Designs	Blog Post	Apr 14, 2022
Solving Common Issues with Respect to PCIe Timing Design on the Modern Server System	Blog Post	Apr 14, 2022
Renesas Introduces Industry’s First PCIe Gen6 Clock Buffers and Multiplexers	News	Apr 14, 2022
Comparing and Contrasting PCIe and Ethernet Clock Jitter Specifications	Blog Post	May 22, 2018

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PCI Express® (PCIe) Clocks

Clocks & Timing

Industry-leading PCI Express Clock Solutions

About PCI Express Clocks