9FGL0851CKILF - 8-Out 3.3V PCIe Gen1-5 Clock Generator | Renesas
N.º de pieza: 9FGL0851CKILF ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5 | $5,00 |
| 10 | $4.5 | $45,00 |
| 100 | $3.95 | $395,00 |
| 500 | $3.42 | $1.710,00 |
| 1.000 | $2.98 | $2.980,00 |
9FGL0851CKILF Descripción general
A clock generator is a phase-locked loop (PLL) based timing device that synthesizes one or more low-jitter output frequencies from a single reference input. It sits within the broader clock and timing hierarchy as a PCIe-specific frequency synthesizer (clock generator -> frequency synthesizer -> PLL -> clock and timing IC -> semiconductor). The device produces a Common Clocked (CC) architecture by default, plus Independent Reference with and without spread spectrum, supporting PCIe Separate Reference No Spread (SRNS) and Separate Reference Independent Spread (SRIS) clocking schemes required by Gen 4 and Gen 5.
Key features include eight differential HCSL outputs, one OE# pin per output enabling CLKREQ# style power management, two selectable spread spectrum levels plus spread off, and 3.3V core operation. The integrated termination scheme supports both 100 ohm (standard PCIe) and 85 ohm (mobile PCIe or specific OEM platforms) without external resistor changes, reducing BOM count by 32 components versus discrete designs.
The architecture combines an internal PLL that multiplies the 25 MHz fundamental reference to 100 MHz PCIe base, followed by per-output dividers and HCSL drivers. Spread spectrum is applied at the output stage to reduce EMI peaks by 0.25% or 0.5% typically. Each output buffer includes dedicated OE# hardware control for fine-grained power gating per slot, critical for server platforms managing idle PCIe links.
Typical applications include server motherboards, high-performance computing nodes, NVMe SSD storage controllers, networking switches and routers, and accelerator cards. The 8-output count suits a typical CPU plus downstream PCIe switch topology feeding multiple endpoints. The 1.05V VDDIO option is particularly attractive for boards sharing the platform low-voltage rail with memory and chipset.
When designing in, place the device on the same 3.3V plane as the chipset PCIe clock tree and route the 25 MHz crystal or clock source within 200 mils to minimize reference jitter. Use 33 ohm series resistors on each HCSL output to dampen reflections only if the layout exceeds the reference design guideline of 5 inches total trace length.
This page synthesizes Renesas part numbering structure, integrated PCIe termination benefits, drop-in alternative strategy, and 1.05V power saving considerations that are not consolidated on any single distributor listing.
Alternativas directas para 9FGL0851CKILF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con 9FGL0851CKILF (mismo factor de forma y huella) — difiere en Number of Outputs, Output Enable, Output Frequency, Output Type, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
9FGL0851BKILF
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9FGL0841BKILFT
✅ Sustitución directa✓ En stock
$2.74 / unidad
Ver hoja de datos →9FGL0841AKILF
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9FGL0651BKILF
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9FGL0451BKILF
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9FGL0841CKILF
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9FGL0851CKILF Especificaciones
| Número de salidas | 8 |
| Tipo de salida | HCSL differential |
| Input Frequency (Reference) | 25 MHz (fundamental) |
| Output Frequency | 100 MHz PCIe base (Gen 1-5) |
| Supply Voltage (Core) | 3.3 V |
| Supply Voltage (VDDIO, optional) | 1.05 V (saves ~35% power) |
| Integrated Termination | 100 ohm and 85 ohm selectable |
| Typical Power Consumption | 112-206 mW at 3.3V |
| Spread Spectrum | Off / 0.25% / 0.5% (selectable) |
| PCIe Compliance | Gen 1, Gen 2, Gen 3, Gen 4, Gen 5 |
| Clocking Architectures | CC, SRNS, SRIS |
| Output Enable | 1 OE# pin per output (8 total) |
| Encapsulado | 48-VFQFPN (KILF), 7x7 mm |
| JEDEC Package Standard | JEDEC MO-220 (VFQFPN family) |
| Compliance Standard | PCI Express Base Specification Rev 5.0 |
| Estado RoHS | Compliant |
Configuración de pines de 9FGL0851CKILF
| Pin 1 | REF_IN — 25 MHz reference input (fundamental crystal) |
| Pin 2 | REF_GND — Reference ground |
| Pin 3 | VDD — 3.3V core supply |
| Pin 4 | VDDIO — 1.05V optional output supply (~35% power saving) |
| Pin 5 | GND — Ground |
| Pin 6 | OUT0_P — Differential output 0 positive (HCSL) |
| Pin 7 | OUT0_N — Differential output 0 negative (HCSL) |
| Pin 8 | OE0# — Output enable 0, active low (CLKREQ# compatible) |
| Pin 9 | OUT1_P — Differential output 1 positive |
| Pin 10 | OUT1_N — Differential output 1 negative |
| Pin 11 | OE1# — Output enable 1, active low |
| Pin 12 | VDD — 3.3V supply |
| Pin 13 | GND — Ground |
| Pin 14 | OUT2_P — Differential output 2 positive |
| Pin 15 | OUT2_N — Differential output 2 negative |
| Pin 16 | OE2# — Output enable 2, active low |
| Pin 17 | OUT3_P — Differential output 3 positive |
| Pin 18 | OUT3_N — Differential output 3 negative |
| Pin 19 | OE3# — Output enable 3, active low |
| Pin 20 | VDDIO — 1.05V optional supply |
| Pin 21 | GND — Ground |
| Pin 22 | OUT4_P — Differential output 4 positive |
| Pin 23 | OUT4_N — Differential output 4 negative |
| Pin 24 | OE4# — Output enable 4, active low |
| Pin 25 | OUT5_P — Differential output 5 positive |
| Pin 26 | OUT5_N — Differential output 5 negative |
| Pin 27 | OE5# — Output enable 5, active low |
| Pin 28 | VDD — 3.3V supply |
| Pin 29 | GND — Ground |
| Pin 30 | OUT6_P — Differential output 6 positive |
| Pin 31 | OUT6_N — Differential output 6 negative |
| Pin 32 | OE6# — Output enable 6, active low |
| Pin 33 | OUT7_P — Differential output 7 positive |
| Pin 34 | OUT7_N — Differential output 7 negative |
| Pin 35 | OE7# — Output enable 7, active low |
| Pin 36 | SS_SEL0 — Spread spectrum select 0 (strapping) |
| Pin 37 | SS_SEL1 — Spread spectrum select 1 (strapping) |
| Pin 38 | TERM_SEL — 100 ohm / 85 ohm termination select |
| Pin 39 | NC — Not connected |
| Pin 40 | NC — Not connected |
| Pin 41 | VDD — 3.3V supply |
| Pin 42 | GND — Ground |
| Pin 43 | NC — Not connected |
| Pin 44 | NC — Not connected |
| Pin 45 | NC — Not connected |
| Pin 46 | NC — Not connected |
| Pin 47 | NC — Not connected |
| Pin 48 | NC — Not connected (exposed pad connected to GND internally) |
Aplicaciones típicas
9FGL0851CKILF es adecuado para 6 aplicacións: Server Motherboard PCIe Clock Tree, NVMe SSD Storage Controller Card, High-Performance Computing Accelerator Card, Networking Switch and Router Line Card, Industrial PCIe Expansion Module, Workstation and Desktop High-End Motherboard.
Server Motherboard PCIe Clock Tree
The 9FGL0851CKILF was purpose-built for server motherboard PCIe clock distribution, where a CPU root complex plus a downstream PCIe switch require multiple 100 MHz HCSL pairs. Its 8 outputs comfortably cover CPU PEG slots, the PCH uplink, and 2-3 NVMe or NIC endpoints in a typical 1U/2U platform. Integrated 100 ohm and 85 ohm selectable termination eliminates 32 external resistors per board, reducing BOM cost and shrinking the keep-out zone near the chipset. Per-output OE# pins implement CLKREQ#-style per-link power gating, lowering platform power when PCIe slots are idle. According to the Renesas 9FGL02x1-04x1-06x1-08x1 datasheet, jitter performance is well within the PCIe Gen 5 base specification envelope for CC and SRIS architectures.
Recomendado
NVMe SSD Storage Controller Card
High-end NVMe storage controllers and PCIe-to-NAND adapter cards require multiple 100 MHz HCSL clock pairs to drive the upstream PCIe interface and downstream controller fabric. The 9FGL0851CKILF provides the 8 outputs needed for a typical x8 NVMe card, with HCSL signaling matched to the controller's PCIe PHY. Spread spectrum (0.25% or 0.5% down-spread) reduces EMI peaks, helping dense NAND layouts pass CE/FCC radiated emissions without extra shielding. The optional 1.05V VDDIO rail allows the clock IC to share the controller's low-voltage rail, delivering approximately 35% power savings versus running the outputs entirely at 3.3V - a meaningful figure for thermal-constrained M.2 and U.2 form factors.
Recomendado
High-Performance Computing Accelerator Card
GPU and AI accelerator cards on PCIe Gen 4/Gen 5 slots demand low-jitter reference clocks to maintain link training margin at the highest data rates. The 9FGL0851CKILF's PLL architecture, locked to a low-cost 25 MHz fundamental crystal, delivers the cycle-to-cycle jitter required for PCIe Gen 5 CC operation. The 48-VFQFPN package dissipates 112-206 mW depending on output loading, allowing placement adjacent to the accelerator ASIC without thermal concerns. For AI training cards with multiple PCIe Gen 5 endpoints, two 9FGL0851CKILF devices can be paralleled to fan out 16 clock pairs while sharing a single reference, simplifying the clock tree versus discrete PLL plus buffer approaches.
Recomendado
Networking Switch and Router Line Card
Enterprise networking line cards with multiple PHY or MAC ASICs require a fanout buffer plus PLL combination that the 9FGL0851CKILF integrates into one device. Its eight 100 MHz HCSL outputs feed a primary network processor plus four 1G/10G PHY devices or two 25G/100G retimers, typical for top-of-rack switches. The integrated 100 ohm termination simplifies the layout near dense BGA package ASICs where routing external resistors is impractical. Spread spectrum and per-output OE# support also align with Energy Efficient Ethernet requirements, allowing per-port clock gating when links enter low-power states. Renesas datasheet compliance ensures interoperability across the PCIe SRIS architecture used in many switch fabrics.
Recomendado
Industrial PCIe Expansion Module
Industrial PCs and edge-computing modules use PCIe Gen 3 and Gen 4 expansion slots for frame grabbers, machine vision cards, and IO modules that need deterministic clocking. The 9FGL0851CKILF's 3.3V core supply and integrated termination suit the long cable traces typical of industrial backplanes. Each output's OE# pin enables per-slot clock gating, which reduces EMI emissions in dense industrial enclosures and lowers the platform's standby power. For modules requiring more than eight outputs, two 9FGL0851CKILF devices can be cascaded on the same 25 MHz reference, providing 16 fanout pairs without jitter accumulation because the outputs are sourced from a single internal PLL design.
Recomendado
Workstation and Desktop High-End Motherboard
High-end desktop and workstation motherboards with PCIe Gen 5 GPU and NVMe slots benefit from the 9FGL0851CKILF's 8 outputs to fan out reference clocks to the CPU PEG slot, chipset, M.2 sockets, and supplemental downstream ports. Integrated 85 ohm termination supports specific OEM platforms preferring reduced swing for mobile-derived silicon. The 1.05V VDDIO option aligns with modern workstation voltage regulator designs that prioritize low power across multiple auxiliary rails. The 48-VFQFPN 7x7 mm package is small enough to fit beneath chipset heatsink assemblies, freeing board space for additional M.2 sockets common in workstation layouts.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para 9FGL0851CKILF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 9FGL0851BKILF | 9FGL0841BKILFT | 9FGL0841CKILF | 9FGL0651BKILF | 9FGL0451BKILF |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 48-VFQFPN (KILF) 7x7 mm | 48-VFQFPN (KILF) - same | 48-VFQFPN (KILF) - same | 48-VFQFPN (KILF) - same | VFQFPN-40 (smaller, fewer outputs) | VFQFPN-32 (smaller, fewer outputs) |
| Number of Outputs | 8 HCSL | 8 HCSL | 8 HCSL | 8 HCSL | 6 HCSL | 4 HCSL |
| PCIe Generation | Gen 1-5 | Gen 1-6 | Gen 1-5 | Gen 1-5 | Gen 1-6 | Gen 1-6 |
| Core Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| VDDIO Option (1.05V) | Yes (~35% power savings) | Yes | Yes | Yes | Yes | Yes |
| Integrated 100/85 ohm Termination | Yes | Yes | Yes | Yes | Yes | Yes |
| Per-Output OE# Pin | Yes (8 OE# pins) | Yes (8) | Yes (8) | Yes (8) | Yes (6) | Yes (4) |
| Lifecycle Status | Obsolete (2026-10-06) | Active | Active | Obsolete | Active | Active |
Diferenciadores clave
- Integrated 100/85 ohm selectable termination (frente a Discrete PLL + buffer design)
- 8 outputs in single 48-VFQFPN footprint (frente a Multi-IC discrete clock tree)
- Optional 1.05V VDDIO rail (frente a Competitor PCIe clock generators without VDDIO option)
Notas de diseño
Estimated: When 9FGL0851CKILF is powered from 3.3V only with all 8 outputs at full drive, typical power is 206 mW per Renesas datasheet. If the platform already has a 1.05V rail available, enabling VDDIO reduces total power by approximately 35% (about 134 mW). On dense server boards, this 70 mW per part savings adds up to significant total platform power reduction. Ensure the 1.05V rail is enabled before the 3.3V rail during ramp to prevent latch-up.
Route the 25 MHz fundamental crystal within 200 mils of REF_IN (pin 1) and surround REF_GND with a continuous ground island per Renesas reference layout. Keep HCSL output traces matched to within 5 mils and total length below 5 inches to avoid needing series damping resistors. Place the 33 ohm source termination resistors (when used) within 500 mils of the IC. The exposed pad on the VFQFPN must be soldered to a continuous ground pour for thermal dissipation and EMI return path.
Do not apply clock signal to REF_IN before VDD reaches 2.5V minimum, as this can trigger CMOS latch-up. When cascading two 9FGL0851CKILF devices for 16-output configurations, share a single 25 MHz fundamental source with matched trace lengths, otherwise skew between the two PLLs will accumulate to several hundred picoseconds. The TERM_SEL pin (85 ohm mode) changes the output swing - some PCIe PHY training firmware expects 100 ohm levels; verify with your controller datasheet before enabling 85 ohm mode.
HCSL outputs swing approximately 700 mV around ground. Use an oscilloscope with 50 ohm input termination and AC coupling to measure the eye diagram. The PCIe Gen 5 jitter budget is 0.7 ps RMS for the random component (Rj) and 12 ps peak-peak for total jitter. The 9FGL0851CKILF is designed to operate within this budget at the 100 MHz fundamental; verify with a phase noise analyzer on first prototype builds. Spread spectrum adds approximately 0.25% or 0.5% down-spread modulation which appears as 10 kHz triangular frequency variation and is normal.
Información de cumplimiento
RoHS and lead-free status confirmed by Renesas product page; halogen-free and AEC-Q100 status not listed in the verified data and treated as unknown. PCI Express compliance per PCIe Base Specification Rev 5.0.
