Features
- 8 OE# pins provide hardware control of 8 outputs
- 20 SMBus bits allow software control of each output
- 3-wire side-band interface provides serial control of all 20 outputs at a 25MHz rate
- Outputs remain Low/Low when powered up with a floating input clock
- Low-Power HCSL (LP-HCSL) outputs reduce device power consumption by 50%
- Zo = 85Ω outputs eliminate 80 resistors, saving 130mm2 of area
- 9 selectable SMBus addresses
- Spread spectrum compatible
- 6mm × 6mm dual-row 80-GQFN
Description
The 9QXL2001C is a 20-output very-low additive phase jitter fanout buffer for PCIe Gen1 to Gen6 applications. The 9QXL2001C provides two methods to control output enables; standard OE# pins and SMBus enable bits, and a simple 3-wire serial interface (side-band interface) that is independent of the SMBus. The side-band interface is enabled via a hardware strap and operates simultaneously with the OE# pins and SMBus enable bits. It offers integrated terminations for 85Ω transmission lines.
Parameters
| Attributes | Value |
|---|---|
| Diff. Outputs | 20 |
| Diff. Output Signaling | LP-HCSL |
| Output Freq Range (MHz) | 1 - 400 |
| Diff. Inputs | 1 |
| Diff. Input Signaling | HCSL |
| Accepts Spread Spec Input | Yes |
| Power Consumption Typ (mW) | 720 |
| Supply Voltage (V) | 3.3 - 3.3 |
| Output Type | LP-HCSL |
| Diff. Termination Resistors | 24 |
| Package Area (mm²) | 81 |
| Battery Backup | No |
| Battery Seal | No |
| CPU Supervisory Function POR | No |
| Crystal Frequency Trimming | No |
| Frequency Out Pin | No |
| Inputs (#) | 1 |
| Input Freq (MHz) | 1 - 400 |
| Function | Fanout Buffer |
| Input Type | HCSL |
| Output Banks (#) | 1 |
| Core Voltage (V) | 3.3 |
| Output Voltage (V) | 0.7 |
| Product Category | PCI Express Clocks, Processor Clock Buffers, Zero Delay Buffers |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| VFQFPN | 6.0 x 6.0 x 0.85 | 80 | 0.5 |
| Part Number | Status | Samples | Longevity | Stock | Package | Budgetary Price (USD) | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Qty. per Reel (#) | Qty. per Carrier (#) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 9QXL2001CNHGK | Active | Available | 2040 Apr | In Stock | VFQFPN | 1ku | $2.5 | 80# | Tray | 3 | 0 | 490# | Yes | e4 NiPdAu | -40 to 105°C | TAIWAN | CHINA, TAIWAN |
| 9QXL2001CNHGK8 | Active | N/A | 2040 Apr | Out of Stock | VFQFPN | 1ku | $2.5 | 80# | Reel | 3 | 4000# | 0 | Yes | e4 NiPdAu | -40 to 105°C | TAIWAN | CHINA, TAIWAN |
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- Product Change NoticePDF 203 KB Mar 02, 2026
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- Application NotePDF 170 KB 7WDXRDKU4E7E-5-57318 May 13, 2014
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- Application NotePDF 442 KB 7WDXRDKU4E7E-5-57298 May 08, 2014
- Application NotePDF 120 KB 7WDXRDKU4E7E-5-57289 May 06, 2014
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- Application NotePDF 431 KB 7WDXRDKU4E7E-5-59216 Dec 06, 2023
- Application NotePDF 1.99 MB 7WDXRDKU4E7E-5-57242 Mar 01, 2022
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- Product Change NoticePDF 203 KB Mar 02, 2026
- Product Change NoticePDF 100 KB Jul 01, 2022
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Introducing Renesas’ enhanced PCIe clock buffer family. These PCIe Gen5 clock buffers offer fanout and zero-delay operating modes, supporting both legacy systems and the most complex timing trees within a single device. Unlike many existing solutions, whose performance limitations force their use in fanout buffer mode, these clock buffers meet both PCIe Gen5 and prominent CPU-specific phase jitter requirements in all operating modes. The extremely low 50fs rms PCIe Gen5 additive phase jitter enables multi-level cascading within the strict PCIe Gen5 jitter budget. Renesas’ high-performance oscillators and clock generators provide an ideal clock source for the enhanced PCIe clock buffer family.
A detailed overview of IDT's full-featured PCI Express (PCIe) clock and timing solutions. The presentation addresses PCIe Gen 1, Gen 2, Gen 3, and Gen 4 architectures and how IDT's industry-leading solutions provide all the functions, features, and performance required by the application.
Presented by Ron Wade, System Architect at IDT. For more information visit the PCIe clocks page.
The 9ZXL1951D is designed to create clocks for PCI Express Generation 4. This video demonstrates how the reference clock for the 9ZXL1951D does not need to be PCI Express Gen4 compliant. When using the Low Bandwidth mode, the 9ZXL1951D will attenuate jitter so its output clocks still pass PCI Express Gen4, even when the input clock only passes PCI Express Gen3. This is most useful when the clock has spread spectrum modulation because it is very difficult to make a very low noise spreading clock.
A brief overview of how data rates have changed from PCI Express (PCIe) Generation 1, Gen 2, Gen 3, Gen 4 and Gen 5.
Presented by Ron Wade, system architect at IDT.
A brief overview of how clock and timing specifications have changed from PCI Express (PCIe) Generation 1, Gen 2, Gen 3, Gen 4 and Gen 5.
Presented by Ron Wade, system architect at IDT (acquired by Renesas).
A brief overview of the PCI Express common clock (CC) jitter model, and the transfer functions as they relate to the timing PLLs. This model applies to PCI Express (PCIe) Gen 2, Gen 3, Gen 4 and Gen 5. The equations would be slightly different for other PCIe architectures, such as SRIS, SRnS, or data clocked.
Presented by Ron Wade, system architect at IDT (acquired by Renesas). For more information about Renesas's PCIe timing solutions, visit the PCI Express (PCIe) Clocks page.
This video compares PCIe Gen3–7 common clock jitter filters with a typical 12kHz to 20MHz plot to highlight the differences in filtering approaches.
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