My Inquiry
My Account
Renesas 9ZXL0451EKILF
- Part No.:
- 9ZXL0451EKILF
- Manufacturer:
- Renesas
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
9ZXL0451EKILF.pdf
- Description:
- IC FANOUT BUFFER 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:477
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
9ZXL0451EKILF from Renesas Electronics is a 4-output zero-delay/fanout buffer optimized for PCIe Gen1–5 and UPI clock distribution in server and high-performance computing systems. It supports 100MHz ZDB mode, delivers <22fs RMS phase jitter (PCIe Gen5 CC), maintains <50ps cycle-to-cycle jitter, and features dedicated OE# pins per output for CLKREQ#-driven power management in low-power states.
For engineers reviewing the 9ZXL0451EKILF datasheet, 9ZXL0451EKILF pinout, 9ZXL0451EKILF application, or 9ZXL0451EKILF equivalent, this device is selected for PCIe reference clock fanout where additive jitter, output skew control, LP-HCSL drive strength, and hardware/SMBus-configurable ZDB/FOB modes are critical design requirements.
Technical Context
The 9ZXL0451EKILF implements a dual-mode PLL architecture supporting both Zero-Delay Buffer (ZDB) and Fanout Buffer (FOB) operation. In ZDB mode, it locks to a 100MHz reference input with integrated feedback path (FBOUT_NC/FBOUT_NC#) to achieve near-zero propagation delay and sub-22fs RMS phase jitter for PCIe Gen5 Common Clocked topologies.
It accepts differential HCSL inputs (DIF_IN/DIF_IN#), provides four LP-HCSL outputs with on-die 50Ω termination per pair, and uses tri-level control pins (^HIBW_BYPM_LOBW#, ^CKPWRGD_PD#, vOE0#–vOE3#) to configure bandwidth, power-down, and per-output enable-enabling dynamic power gating aligned with PCIe L1/L2 states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Count | 4 LP-HCSL differential outputs with integrated 50Ω termination per pair, eliminating up to 8 external resistors |
| ZDB Mode Phase Jitter | <22fs RMS (PCIe Gen5 Common Clocked), enabling compliance with stringent PCIe 5.0 timing budgets |
| FOB Mode Additive Jitter | <24fs RMS (PCIe Gen5 CC), ensuring signal integrity across cascaded clock trees |
| Cycle-to-Cycle Jitter | <50ps, limiting timing uncertainty in high-speed serial link sampling windows |
| Output-to-Output Skew | <50ps, maintaining inter-lane alignment for multi-lane PCIe/NVMe interfaces |
| Operating Temperature | -40°C to +85°C industrial range, validated for sustained operation in server backplanes and storage enclosures |
| Supply Voltages | VDDA = 3.3V (PLL core), VDDR = 3.3V (input receiver), VDD = 3.3V (logic), all within ±4.5% tolerance |
Pinout & Package
9ZXL0451EKILF is housed in a 5 × 5 mm, 32-pin Very Thin Quad Flat No-Lead (VFQFPN) package with 0.5mm pitch and exposed thermal pad (EPAD) requiring connection to PCB ground for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIF_IN / DIF_IN# | Differential HCSL clock input pair | Accepts 300–1000mVpp differential input; internal biasing enables direct connection to PCIe REFCLK sources |
| DIF0–DIF3 / DIF0#–DIF3# | 4 LP-HCSL differential clock outputs | Each pair includes integrated 50Ω series termination; compatible with PCIe slot and device clock loads without external resistors |
| vOE0#–vOE3# | Active-low per-output enable controls | Hardware-driven OE# pins support PCIe CLKREQ# protocol for individual output gating during L1/L2 low-power states |
| ^CKPWRGD_PD# | Power-good input with internal 120kΩ pull-up | Asserted high to initiate startup sequence; driven low to enter hardware power-down mode (<5mA total IDD) |
| ^HIBW_BYPM_LOBW# | Tri-level PLL bandwidth select input | Selects High BW (low latency), Bypass (no PLL), or Low BW (jitter filtering) modes to optimize for cascaded or isolated clock domains |
| FBOUT_NC / FBOUT_NC# | Dedicated feedback output pair | Internal-only path for ZDB mode; must remain unconnected externally to maintain 0-delay loop integrity |
| VDDA / VDDR / VDD | Separate analog/digital power rails | Independent supply domains isolate PLL core (VDDA), input receiver (VDDR), and logic/output drivers (VDD) to suppress noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LP-HCSL termination | Eliminates 8 external 50Ω resistors per output pair, reducing BOM count and PCB area while improving impedance matching |
| Dedicated per-output OE# pins | Enables independent clock gating per PCIe lane during L1/L2 states, cutting dynamic power by >90% versus global disable |
| Hardware-selectable PLL bandwidth | Tri-level ^HIBW_BYPM_LOBW# pin allows real-time optimization of jitter peaking vs. lock time without SMBus overhead |
| ZDB/FOB mode selection | Configurable via SMBus or hardware pins to support both zero-delay (clock forwarding) and fanout (jitter cleaning) architectures |
| Spread-spectrum compatibility | Supports SRIS/SRNS modulation schemes required for PCIe Gen3+ EMI reduction without degrading jitter performance |
Applications
| PCIe Gen5 Server Backplane Clocking | NVMe U.2/U.3 Storage Interconnect |
|---|---|
Use Scenario: Distributing a single 100MHz PCIe Gen5 reference clock to four CPU/ASIC sockets on a 2U server motherboard. IC Role / Device Role / Timing Role: Zero-delay buffer providing matched-skew, low-additive-jitter fanout with per-socket CLKREQ#-controlled gating. Use Value: Enables simultaneous Gen5 link training across all sockets while meeting <22fs RMS phase jitter and <50ps skew requirements. |
Use Scenario: Driving four NVMe SSDs in a hot-swappable U.2 enclosure with independent power-state coordination. IC Role / Device Role / Timing Role: LP-HCSL fanout buffer with hardware OE# control synchronized to each SSD's power-ready signal. Use Value: Reduces system-level standby current by disabling unused SSD clocks, while maintaining <24fs FOB jitter for stable 32GT/s link initialization. |
| AI Accelerator Rack Interconnect | Industrial PCIe-Based Vision System |
Use Scenario: Clocking multiple FPGA-based AI accelerators in a PCIe-switched rack where deterministic latency is critical. IC Role / Device Role / Timing Role: ZDB-mode buffer delivering phase-aligned 100MHz clocks with sub-22fs jitter to minimize inter-accelerator synchronization error. Use Value: Ensures consistent timestamp alignment across distributed inference pipelines, directly supporting sub-microsecond latency SLAs. |
Use Scenario: Providing robust clock distribution to PCIe frame grabbers and GPU compute cards in factory-floor machine vision controllers. IC Role / Device Role / Timing Role: Industrial-temperature-rated (−40°C to +85°C) fanout buffer with spread-spectrum support for EMI-sensitive imaging environments. Use Value: Maintains PCIe Gen3 link stability under thermal cycling and electromagnetic noise, avoiding frame drop due to clock-induced bit errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock fanout applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 9ZXL0431EKILF | Same 4-output LP-HCSL function but lacks SMBus interface and programmable PLL bandwidth; fixed ZDB/FOB mode | Suitable only for static clock tree designs without runtime reconfiguration needs | Select when cost sensitivity outweighs need for SMBus control or bandwidth tuning |
| ICS8430I-41LFT | 4-output LVDS fanout buffer; no integrated termination; higher 55ps max skew; supports 100–250MHz range | Requires external 100Ω termination; incompatible with LP-HCSL receivers; limited to Gen3/Gen4 systems | Choose only if existing board uses LVDS signaling and Gen5 jitter specs are not required |
Compared with 9ZXL0431EKILF and ICS8430I-41LFT, the 9ZXL0451EKILF uniquely combines PCIe Gen5-compliant jitter, hardware-configurable PLL bandwidth, per-output OE#, and integrated LP-HCSL termination-making it the only option for new Gen5 server and NVMe designs requiring full specification compliance and dynamic power control.
Availability
9ZXL0451EKILF is available at Aetrix Electronics and suitable for PCIe Gen5 server backplanes, NVMe storage subsystems, and AI accelerator interconnects requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 9ZXL0451EKILF 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 is a global semiconductor leader specializing in microcontrollers, analog power, and timing solutions for automotive, industrial, and datacenter applications.
The 9ZXL04x1E family is designed specifically for PCIe Gen1–5 and UPI clock distribution, addressing jitter, skew, power gating, and signal integrity challenges in high-density server and storage platforms.
FAQ
What clock frequencies does the 9ZXL0451EKILF support in ZDB mode?
The 9ZXL0451EKILF supports 100MHz ZDB mode operation, as confirmed in the datasheet's Key Specifications and Pin Descriptions sections. It does not support 133.33MHz ZDB mode-that capability is exclusive to the 9ZXL08x1E and 9ZXL12x1E variants. The 100MHz ZDB frequency ensures compliance with PCIe Gen5 Common Clocked architecture timing requirements.
Does the 9ZXL0451EKILF require external termination resistors for its LP-HCSL outputs?
No, the 9ZXL0451EKILF integrates 50Ω series termination on each LP-HCSL output pair (DIF0–DIF3 and their complements), eliminating the need for up to eight external resistors. This integration is explicitly stated in the Features section and verified in the Pin Descriptions table, where "integrated terminations" are called out as a key differentiator for the 9ZXLxx51 device variant.
How is power-down controlled on the 9ZXL0451EKILF?
Power-down on the 9ZXL0451EKILF is controlled via the ^CKPWRGD_PD# pin, which has an internal 120kΩ pull-up resistor. Driving this pin low places the device into hardware power-down mode, reducing total supply current to <5mA. This behavior is documented in the Pin Descriptions table and Electrical Characteristics section under tDRVPD and IDDAPD/IDDPD parameters.
Can the 9ZXL0451EKILF be used in PCIe SRIS (Separate Refclk Independent SSC) architectures?
Yes, the 9ZXL0451EKILF is explicitly qualified for SRIS architectures, with measured PCIe Gen5 SRIS phase jitter of 0.084–0.091ps RMS (Table 12). Its spread-spectrum compatibility and low-bandwidth ZDB mode ensure robust operation in SRIS topologies where independent SSC modulation is applied per link, as confirmed in the Applications and Key Specifications sections.
What is the thermal resistance (θJA) of the 9ZXL0451EKILF package?
The 9ZXL0451EKILF uses the NLG32 32-VFQFPN package, with a typical junction-to-air thermal resistance (θJA) of 44°C/W under still-air conditions, as specified in Table 3 of the datasheet. This value assumes the EPAD is soldered to a grounded copper plane, and thermal performance improves to 30.9°C/W with 5 m/s airflow-critical for thermal design in dense server PCB layouts.
9ZXL0451EKILF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Fanout Buffer, Zero Delay Buffer
- PLL:
- Yes with Bypass
- Input:
- HCSL
- Output:
- HCSL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 4:12
- Differential - Input:Output:
- No/Yes
- Frequency - Max:
- -
- Divider/Multiplier:
- No/No
- Voltage - Supply:
- 3.135V ~ 3.465V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-VFQFPN (5x5)
9ZXL0451EKILF FAQ
1.How can I place an order for 9ZXL0451EKILF through Aetrix?
Please submit a Request for Quotation (RFQ) for 9ZXL0451EKILF 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 9ZXL0451EKILF reliable?
The price and inventory of 9ZXL0451EKILF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 9ZXL0451EKILF is usually 5 days.
3.What payment methods are accepted for 9ZXL0451EKILF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 9ZXL0451EKILF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 9ZXL0451EKILF?
9ZXL0451EKILF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 9ZXL0451EKILF 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 9ZXL0451EKILF?
For technical support, including 9ZXL0451EKILF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 9ZXL0451EKILF requirements.
6.How does Aetrix verify that 9ZXL0451EKILF is sourced from the original manufacturer or authorized distributors?
All 9ZXL0451EKILF 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 9ZXL0451EKILF meets industry standards.
7.What is the process for return or replacement of 9ZXL0451EKILF?
All 9ZXL0451EKILF units undergo pre-shipment inspection (PSI). If there is an issue with 9ZXL0451EKILF, 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 9ZXL0451EKILF part is unused and in its original packaging.
Return procedure for 9ZXL0451EKILF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
9ZXL0451EKILF Tags
-
CD74HCT4046AM96
Texas Instruments
-
MC14046BDWR2G
onsemi
-
501MILFT
Renesas
-
CD74HC7046AM
Texas Instruments
-
CDCVF2505PWR
Texas Instruments
-
RC19004A100GNL#KB0
Renesas
-
SI5351A-B-GTR
Skyworks Solutions Inc.
-
CY2305SXI-1T
Infineon Technologies
-
570BILFT
Renesas
-
CDCE913PWR
Texas Instruments
-
CY2305SXI-1HT
Infineon Technologies
-
DS1086LU+T
Analog Devices Inc./Maxim Integrated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
