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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Renesas 9ZXL0851EKILFT

Name: 9ZXL0851EKILFT
Brand: Renesas
SKU: 9ZXL0851EKILFT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 9ZXL0851EKILFT

Manufacturer:: Renesas

Category:: Application Specific Clock/Timing

Package:: 48-VFQFN Exposed Pad

Datasheet:: 9ZXL0851EKILFT.pdf

Description:: DB800ZL "LITE"

Quantity:: RFQ Add To RFQ list

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Product details

Overview

9ZXL0851EKILFT from Renesas Electronics is an 8-output zero-delay/fanout buffer optimized for PCIe Gen1–5 and UPI clock distribution in high-performance computing systems. It supports 100 MHz and 133.33 MHz ZDB modes, delivers <22 fs RMS phase jitter (PCIe Gen5 CC), maintains <50 ps output-to-output skew, and features dedicated OE# pins per output for CLKREQ#-driven power gating.

For engineers reviewing the 9ZXL0851EKILFT datasheet, 9ZXL0851EKILFT pinout, 9ZXL0851EKILFT application, or 9ZXL0851EKILFT equivalent, this device is selected for low-jitter, spread-spectrum-compatible clock fanout in server CPU interconnects, NVMe storage controllers, and accelerator timing architectures requiring DB2000Q/PCIe Gen5 compliance and industrial temperature operation up to +105°C.

Technical Context

The 9ZXL0851EKILFT implements a dual-mode PLL architecture supporting both Zero-Delay Buffer (ZDB) and Fanout Buffer (FOB) operation, with hardware-selectable PLL bandwidth to suppress jitter peaking in cascaded topologies. Its differential HCSL inputs accept 300–900 mV crossover voltage and support 1–400 MHz FOB operation.

All eight LP-HCSL outputs integrate on-die 50 Ω series terminations, eliminating four external resistors per output pair. Dedicated vOE# pins enable per-output disable control synchronized to PCIe CLKREQ#, while tri-level ^HIBW_BYPM_LOBW# and ^100M_133M# pins configure PLL bandwidth and operating frequency respectively.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count	8 LP-HCSL differential outputs with integrated 50 Ω series termination per pair
ZDB Phase Jitter (PCIe Gen5 CC)	<22 fs RMS - meets PCIe Gen5 common-clocked jitter spec at 32 GT/s
Fanout Buffer Additive Jitter (PCIe Gen5 CC)	<24 fs RMS - enables clean clock replication without amplifying source jitter
Output-to-Output Skew	<50 ps - ensures tight timing alignment across all 8 outputs for synchronous interfaces
Operating Temperature Range	−40°C to +105°C - qualified for extended industrial environments in servers and accelerators
Supply Voltages	VDDA = 3.3 V (PLL core), VDDR = 3.3 V (receiver), VDDIO = 3.3 V (LP-HCSL outputs)
Frequency Modes	ZDB: 100 MHz or 133.33 MHz; FOB: 1–400 MHz - supports both reference clock regeneration and direct fanout

Pinout & Package

9ZXL0851EKILFT is housed in a 6 × 6 mm, 48-pin Very Thin Quad Flat No-Lead (VFQFPN) package with 0.4 mm pitch and exposed thermal pad (EPAD, Pin 49) requiring connection to GND for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
DIF_IN / DIF_IN#	Differential HCSL input pair	Accepts 300–900 mV differential swing; internal 120 kΩ pull-down on DIF_IN# enables single-ended use
DIF0–DIF7 / DIF0#–DIF7#	8 LP-HCSL differential output pairs	Each includes integrated 50 Ω series termination; compatible with standard HCSL receivers
vOE0#–vOE7#	Active-low output enable inputs	Per-output control for PCIe CLKREQ#-driven dynamic power gating; internal 120 kΩ pull-down
^100M_133M#	Latched frequency select input	Tri-level pin (internal 120 kΩ pull-up) sets ZDB mode to 100 MHz or 133.33 MHz
^HIBW_BYPM_LOBW#	PLL bandwidth control input	Tri-level pin selects high-bandwidth, bypass, or low-bandwidth PLL mode to minimize jitter peaking
^CKPWRGD_PD#	Power-good / power-down control	High enables startup; low forces power-down mode with sub-5 mA total IDDAPD + IDDPD current
SMBCLK / SMBDAT	SMBus interface	Supports configuration of ZDB/FOB mode, spread-spectrum, and PLL settings at up to 500 kHz
FBOUT_NC / FBOUT_NC#	Internal feedback path outputs	Not connected externally; provide matched delay paths to achieve true zero-delay operation

Key Features

Feature	Design Value
Integrated LP-HCSL terminations	Eliminates 16 external 50 Ω resistors (8 output pairs × 2 lines), reducing BOM count and PCB area
Dedicated per-output OE# pins	Enables precise, independent control of each output's power state to meet PCIe L1/L2 substates
Selectable PLL bandwidth	Minimizes jitter peaking in multi-stage clock trees by adapting loop response to upstream jitter profile
Hardware/SMBus mode selection	Allows ZDB or FOB operation via pin strapping or runtime reconfiguration without firmware dependency
Spread-spectrum compatibility	Supports SRIS/SRNS architectures with <0.091 ps RMS jitter (PCIe Gen5 SRIS), preserving EMI reduction
Extended temperature range	Rated for −40°C to +105°C operation, enabling deployment in thermally demanding server and accelerator chassis

Applications

Server CPU Interconnect Timing	NVMe Storage Controller Clocking
Use Scenario: Distributing low-jitter reference clocks from a central PCIe root complex to multiple CPU sockets and memory controllers in 2U/4U rack servers. IC Role / Device Role / Timing Role: Zero-delay buffer regenerating 100 MHz or 133.33 MHz QPI/UPI reference clocks with <22 fs RMS jitter to meet DB2000Q skew and additive jitter specs. Use Value: Enables deterministic timing across multi-socket platforms while maintaining PCIe Gen5 compliance and supporting CLKREQ#-based power gating.	Use Scenario: Providing synchronized, low-skew clocks to multiple NVMe SSD controllers and host-side PCIe switches in enterprise storage arrays. IC Role / Device Role / Timing Role: 8-output fanout buffer delivering <50 ps output-to-output skew and <24 fs RMS additive jitter for Gen4/Gen5 link training stability. Use Value: Reduces bit error rate during high-speed link negotiation and sustains full bandwidth across parallel NVMe lanes under thermal stress.
AI Accelerator Board Clock Distribution	Industrial Edge Computing Platform
Use Scenario: Fanouting PCIe reference clocks to GPU, FPGA, and ASIC accelerators on a high-density compute card with strict EMI limits. IC Role / Device Role / Timing Role: Spread-spectrum-compatible LP-HCSL buffer operating in SRIS mode with <0.091 ps RMS jitter (PCIe Gen5). Use Value: Meets Class B EMI requirements without sacrificing timing margin, while enabling per-accelerator clock gating via vOE# pins.	Use Scenario: Delivering robust, low-jitter clocks to industrial PLCs, vision processors, and real-time I/O modules deployed in uncontrolled ambient environments. IC Role / Device Role / Timing Role: Industrial-qualified clock buffer operating from −40°C to +105°C with guaranteed DB2000Q and PCIe Gen3+ jitter performance. Use Value: Ensures long-term timing reliability in fanless enclosures and wide-temperature deployments without derating or thermal throttling.

Server CPU Interconnect Timing

NVMe Storage Controller Clocking

Use Scenario: Distributing low-jitter reference clocks from a central PCIe root complex to multiple CPU sockets and memory controllers in 2U/4U rack servers.

IC Role / Device Role / Timing Role: Zero-delay buffer regenerating 100 MHz or 133.33 MHz QPI/UPI reference clocks with <22 fs RMS jitter to meet DB2000Q skew and additive jitter specs.

Use Value: Enables deterministic timing across multi-socket platforms while maintaining PCIe Gen5 compliance and supporting CLKREQ#-based power gating.

Use Scenario: Providing synchronized, low-skew clocks to multiple NVMe SSD controllers and host-side PCIe switches in enterprise storage arrays.

IC Role / Device Role / Timing Role: 8-output fanout buffer delivering <50 ps output-to-output skew and <24 fs RMS additive jitter for Gen4/Gen5 link training stability.

Use Value: Reduces bit error rate during high-speed link negotiation and sustains full bandwidth across parallel NVMe lanes under thermal stress.

AI Accelerator Board Clock Distribution

Industrial Edge Computing Platform

Use Scenario: Fanouting PCIe reference clocks to GPU, FPGA, and ASIC accelerators on a high-density compute card with strict EMI limits.

IC Role / Device Role / Timing Role: Spread-spectrum-compatible LP-HCSL buffer operating in SRIS mode with <0.091 ps RMS jitter (PCIe Gen5).

Use Value: Meets Class B EMI requirements without sacrificing timing margin, while enabling per-accelerator clock gating via vOE# pins.

Use Scenario: Delivering robust, low-jitter clocks to industrial PLCs, vision processors, and real-time I/O modules deployed in uncontrolled ambient environments.

IC Role / Device Role / Timing Role: Industrial-qualified clock buffer operating from −40°C to +105°C with guaranteed DB2000Q and PCIe Gen3+ jitter performance.

Use Value: Ensures long-term timing reliability in fanless enclosures and wide-temperature deployments without derating or thermal throttling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
9ZXL0831EKILFT	Same 48-VFQFPN package and pinout, but uses external 50 Ω terminations (not integrated); higher board-level component count	Preferred where design requires flexibility to adjust termination values or supports legacy HCSL loads with non-standard impedance	Select when board layout allows space for discrete terminations and system-level tuning of edge rates is required
ICS85310AGI-01LFT	8-output LVDS fanout buffer; no ZDB mode; 0.3 ps RMS cycle-to-cycle jitter; operates only up to 250 MHz	Suitable for lower-frequency, non-PCIe Gen5 applications where LVDS signaling and fixed fanout suffice	Choose for cost-sensitive industrial designs needing LVDS compatibility and simpler configuration, but not PCIe Gen5 or ZDB functionality

Compared with 9ZXL0831EKILFT, the 9ZXL0851EKILFT reduces external component count and improves signal integrity via integrated terminations; versus ICS85310AGI-01LFT, it adds ZDB mode, PCIe Gen5 compliance, and extended frequency range - critical for next-generation server and accelerator timing.

Availability

9ZXL0851EKILFT is available at Aetrix Electronics and suitable for server motherboard design, NVMe storage controller development, and AI accelerator board integration requiring stable component supply, full lifecycle support, and traceable sourcing for high-reliability deployments.

Supply support for 9ZXL0851EKILFT 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and datacenter applications.

The 9ZXL0851EKILFT belongs to Renesas' high-performance clock buffer product line, engineered specifically for PCIe Gen1–5, QPI/UPI, and DB2000Q-compliant timing distribution in servers, accelerators, and high-end storage systems.

FAQ

What is the maximum operating frequency of the 9ZXL0851EKILFT in Fanout Buffer mode?

The 9ZXL0851EKILFT supports Fanout Buffer (FOB) operation from 1 MHz to 400 MHz across all devices in the family. This range is confirmed in the datasheet's Key Specifications section and applies directly to the 9ZXL0851EKILFT, enabling flexible clock replication for PCIe reference clocks, memory interfaces, and custom logic timing domains without PLL locking constraints.

Does the 9ZXL0851EKILFT support PCIe Gen5 Common Clocked (CC) architecture jitter requirements?

Yes, the 9ZXL0851EKILFT meets PCIe Gen5 Common Clocked jitter specifications with <22 fs RMS phase jitter in ZDB mode and <24 fs RMS additive phase jitter in FOB mode. These values are explicitly stated in the datasheet's Key Specifications table and verified under DB2000Q and QPI/UPI test conditions, making it compliant for Gen5 root complex and endpoint timing applications.

How many output enable (OE#) pins does the 9ZXL0851EKILFT have, and what is their function?

The 9ZXL0851EKILFT has eight dedicated active-low output enable pins - vOE0# through vOE7# - one for each of its eight LP-HCSL outputs. Each pin features an internal 120 kΩ pull-down resistor and directly controls the corresponding output's driver stage, enabling PCIe CLKREQ#-driven power gating for L1/L2 substates without requiring external logic or firmware intervention.

What package type and thermal characteristics does the 9ZXL0851EKILFT use?

The 9ZXL0851EKILFT is packaged in a 6 × 6 mm, 48-pin VFQFPN (NDG48) with 0.4 mm pitch and an exposed EPAD (Pin 49) that must be soldered to ground. Its thermal resistance is θJA0 = 30 °C/W (still air) and θJC = 19 °C/W, enabling reliable operation at full load within the −40°C to +105°C industrial temperature range without forced airflow.

Can the 9ZXL0851EKILFT operate in both Zero-Delay Buffer and Fanout Buffer modes?

Yes, the 9ZXL0851EKILFT supports both Zero-Delay Buffer (ZDB) and Fanout Buffer (FOB) modes via hardware strapping (^HIBW_BYPM_LOBW#) or SMBus command. In ZDB mode, it locks to 100 MHz or 133.33 MHz reference inputs; in FOB mode, it passes through 1–400 MHz inputs with ultra-low additive jitter - a dual capability confirmed in the datasheet's Features and Key Specifications sections.

9ZXL0851EKILFT Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: Intel QPI, PCI Express (PCIe)

Input:: Clock

Output:: HCSL

Number of Circuits:: 1

Ratio - Input:Output:: 1:8

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 400MHz

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-VFQFPN (6x6)

9ZXL0851EKILFT FAQ

1.How can I place an order for 9ZXL0851EKILFT through Aetrix?

Please submit a Request for Quotation (RFQ) for 9ZXL0851EKILFT 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 9ZXL0851EKILFT reliable?

The price and inventory of 9ZXL0851EKILFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 9ZXL0851EKILFT is usually 5 days.

3.What payment methods are accepted for 9ZXL0851EKILFT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 9ZXL0851EKILFT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 9ZXL0851EKILFT?

9ZXL0851EKILFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 9ZXL0851EKILFT 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 9ZXL0851EKILFT?

For technical support, including 9ZXL0851EKILFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 9ZXL0851EKILFT requirements.

6.How does Aetrix verify that 9ZXL0851EKILFT is sourced from the original manufacturer or authorized distributors?

All 9ZXL0851EKILFT 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 9ZXL0851EKILFT meets industry standards.

7.What is the process for return or replacement of 9ZXL0851EKILFT?

All 9ZXL0851EKILFT units undergo pre-shipment inspection (PSI). If there is an issue with 9ZXL0851EKILFT, 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 9ZXL0851EKILFT part is unused and in its original packaging.

Return procedure for 9ZXL0851EKILFT:

1.Submit a request within 90 days.

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

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