SI52208-A01AGM - 8-Output PCIe Gen 1-6 Clock Generator | Skyworks
料号： SI52208-A01AGM ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.72 | $6.72 |
| 10 | $6.05 | $60.50 |
| 100 | $5.38 | $538.00 |
| 500 | $4.71 | $2,355.00 |
| 1,000 | $4.1 | $4,100.00 |
SI52208-A01AGM 概述
A PCIe clock generator is a specialized timing IC that produces the reference clocks required by PCI Express lanes on a motherboard or add-in card. Clock generators sit in the broader hierarchy of clock and timing ICs -> frequency synthesizers -> PLL-based timing -> semiconductor, and they are essential whenever multiple downstream devices (root complex, switch, retimer, endpoint) must be fed a low-jitter, spec-compliant reference. The Si522xx family (Si52212/08/04/02) is purpose-built for this role and integrates a fractional-N PLL, output dividers, and HCSL drivers on a single silicon die.
Key features include 8 differential HCSL outputs, hardware Output Enable pins for each output pair, Spread Spectrum Enable for EMI reduction (down-spread of -0.25% / -0.5% typical), selectable 100 / 133 / 200 MHz output frequencies via FREQ_SEL pin, low-power standby mode, and I2C control of all major parameters. Typical jitter is 0.085 ps RMS (12 kHz - 20 MHz) which exceeds the PCIe Gen 6 specification with margin, and supply current is approximately 60-90 mA depending on output loading and enabled channel count.
Architecturally, the Si52208-A01 uses a fractional-N PLL with an integrated reference, divider chain, and eight push-pull HCSL output buffers. The 48-QFN exposed pad provides a low thermal resistance path for the moderate power dissipation. The combination of individual OE pins, hardware SSEN, and I2C control makes the device suitable for both legacy strap-controlled designs and modern software-managed platforms.
Typical applications include desktop and server PCIe root complexes, workstation motherboards, NVMe SSD controllers, PCIe retimer cards, network switches with PCIe fabric, and embedded compute platforms. The 100 MHz default and SRIS compliance support both common-clock and independent-refclk topologies required by modern server platforms.
When designing with this part, observe the HCSL termination requirement: each differential pair needs a 100 ohm differential near-end termination to VTT, and the Si52208's integrated current-mode drivers source the necessary bias current. Decouple VDD with 0.1 uF and 1 uF ceramics placed within 2 mm of the supply pins, and stitch the exposed pad with at least nine thermal vias for heat spreading.
This page synthesizes distributor pricing, same-family drop-in alternatives (Si52212, Si52204, Si52202), cross-brand equivalents (Renesas 9FGL08, IDT 9DBL08), and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： SI52208-A01AGM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SI52208-A01AGM （相同外形与封装尺寸） ——差异在于 Package, Number of Outputs, Output Type, Operating Temperature, Output Frequency.
快速对比工具——选择替代料号进行并排对比：
SI52212-A01AGM
✅ 直接替换📋 参考替代料（不在目录中）
SI52204-A01AGM
✅ 直接替换📋 参考替代料（不在目录中）
SI52208-A02AGM
✅ 直接替换📋 参考替代料（不在目录中）
SI52202-A01AGM
✅ 直接替换📋 参考替代料（不在目录中）
9FGL0841CKILFT
✅ 直接替换✓ 有现货
$3.15 / 个
查看数据手册 →9DBL0841BKILF
✅ 直接替换📋 参考替代料（不在目录中）
SI52208-A01AGM 规格参数
| Product Type | PCI Express Clock Generator |
| Output Channels | 8 differential HCSL outputs |
| Output Frequency | 100 MHz (default); 133 / 200 MHz selectable |
| PCIe Compliance | Gen 1, Gen 2, Gen 3, Gen 4, Gen 5, Gen 6, SRIS |
| Phase Jitter (Gen 6) | 0.085 ps RMS (12 kHz to 20 MHz) |
| Supply Voltage (VDD) | 1.5 V to 1.8 V |
| Supply Voltage (VDDA) | 3.3 V |
| 输出类型 | HCSL (current-mode, push-pull) |
| Spread Spectrum | Down-spread -0.25% / -0.5% (SSEN pin or I2C) |
| Control Interface | Hardware pins + I2C |
| 工作温度 | -40C to +85C (industrial) |
| 封装 | 48-QFN (6x6 mm) with exposed pad |
| 安装类型 | Surface Mount |
| MSL 等级 | 2 (1 year) |
| RoHS 状态 | Compliant |
SI52208-A01AGM 引脚配置
| 引脚 1 | VDD — Core supply 1.5V-1.8V |
| 引脚 2 | SDA — I2C serial data |
| 引脚 3 | SCL — I2C serial clock |
| 引脚 4 | SSEN — Spread spectrum enable (active high) |
| 引脚 5 | FREQ_SEL — Frequency select (100/133/200 MHz) |
| 引脚 6 | OE0 — Output enable for pair 0 (active high) |
| 引脚 7 | OE1 — Output enable for pair 1 |
| 引脚 8 | OE2 — Output enable for pair 2 |
| 引脚 9 | OE3 — Output enable for pair 3 |
| 引脚 10 | GND — Ground |
| 引脚 11 | OE4 — Output enable for pair 4 |
| 引脚 12 | OE5 — Output enable for pair 5 |
| 引脚 13 | OE6 — Output enable for pair 6 |
| 引脚 14 | OE7 — Output enable for pair 7 |
| 引脚 15 | VDDA — Analog supply 3.3V |
| 引脚 16 | NC — Not connected (per datasheet) |
| 引脚 17 | CLK0_P — HCSL output 0 positive |
| 引脚 18 | CLK0_N — HCSL output 0 negative |
| 引脚 19 | CLK1_P — HCSL output 1 positive |
| 引脚 20 | CLK1_N — HCSL output 1 negative |
| 引脚 21 | GND — Ground |
| 引脚 22 | CLK2_P — HCSL output 2 positive |
| 引脚 23 | CLK2_N — HCSL output 2 negative |
| 引脚 24 | CLK3_P — HCSL output 3 positive |
| 引脚 25 | CLK3_N — HCSL output 3 negative |
| 引脚 26 | VDD — Core supply 1.5V-1.8V |
| 引脚 27 | CLK4_P — HCSL output 4 positive |
| 引脚 28 | CLK4_N — HCSL output 4 negative |
| 引脚 29 | CLK5_P — HCSL output 5 positive |
| 引脚 30 | CLK5_N — HCSL output 5 negative |
| 引脚 31 | GND — Ground |
| 引脚 32 | CLK6_P — HCSL output 6 positive |
| 引脚 33 | CLK6_N — HCSL output 6 negative |
| 引脚 34 | CLK7_P — HCSL output 7 positive |
| 引脚 35 | CLK7_N — HCSL output 7 negative |
| 引脚 36 | VDDA — Analog supply 3.3V |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
| 引脚 41 | TEST — Factory test pin (float or GND in application) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | VDD — Core supply 1.5V-1.8V |
| 引脚 45 | NC — Not connected (per datasheet) |
| 引脚 46 | NC — Not connected (per datasheet) |
| 引脚 47 | NC — Not connected (per datasheet) |
| 引脚 48 | GND — Ground |
典型应用
SI52208-A01AGM 适用于 7 应用s: Server / Desktop PCIe Root Complex, NVMe SSD Controller Card, PCIe Retimer / Signal-Conditioning Card, Network Switch with PCIe Fabric, Workstation Motherboard (Multi-GPU), Embedded Compute Module, FPGA-Based PCIe Acceleration Card.
Server / Desktop PCIe Root Complex
The SI52208-A01AGM is the primary 100 MHz reference clock source for desktop and server motherboards, providing one HCSL pair per PCIe slot or downstream device. Its 0.085 ps RMS phase jitter exceeds the PCIe Gen 6 specification with margin, which is essential when the root complex must interoperate with retimers and endpoints across multiple lanes. The 8-output count covers typical ATX boards with 2-3 x16 slots and several x1 slots without requiring an external zero-delay buffer. The hardware OE pins allow the BIOS to disable unused outputs for power savings during S3/S5 states, while I2C control enables runtime spread-spectrum toggling for EMI compliance.
推荐
NVMe SSD Controller Card
NVMe SSD add-in cards use the SI52208-A01AGM to deliver a clean 100 MHz reference to the NVMe controller and the PCIe PHY. The 8 outputs support multi-drive NVMe carriers with several controllers on a single riser. Low jitter (0.085 ps RMS) is critical because NVMe Gen 4/5 links have tight eye-mask budgets and reference-clock phase noise directly translates into bit-error-rate. The 1.8 V VDD operation matches the typical NVMe card power tree, and the integrated spread spectrum reduces EMI emissions that could disturb nearby RF components on densely-populated M.2 carrier boards.
推荐
PCIe Retimer / Signal-Conditioning Card
PCIe Gen 5/6 retimer cards embed the SI52208-A01AGM to fan out reference clocks to upstream and downstream retimer ICs (typically AST/Broadcom/Microchip retimers). The 8 differential outputs support 4 upstream + 4 downstream retimer pairs, enabling a full-duplex retimer card with one reference domain. Spread-spectrum capability is essential in retimer cards because they sit close to high-speed serial links and EMI is a critical concern. The exposed thermal pad keeps junction temperature within spec at full 8-output loading (approximately 90 mA total supply current).
推荐
Network Switch with PCIe Fabric
Top-of-rack and leaf-spine switches with PCIe fabric use the SI52208-A01AGM to clock the PCIe switch ASIC and multiple downstream NPUs or retimers. The 8 HCSL outputs match the typical PCIe switch ASIC reference-clock input requirement, and the individual OE pins enable per-port clock gating for unused fabric lanes. Industrial temperature range (-40C to +85C) supports deployment in non-climate-controlled data-center aisles. I2C programmability enables the BMC to adjust spread spectrum and output frequency at runtime for EMI tuning per switch configuration.
推荐
Workstation Motherboard (Multi-GPU)
Multi-GPU workstation boards use the SI52208-A01AGM to provide 100 MHz references to each PCIe x16 slot and the CPU's PCIe root complex. With 8 outputs, a typical configuration is 2 CPU lanes + 4 GPU slots + 2 NVMe M.2 sockets. The 0.085 ps RMS Gen 6 jitter budget with margin is critical for professional workstation applications where link-training failures cause expensive downtime. Spread spectrum reduces EMI from the densely-packed GPU power converters, and the 48-QFN small footprint fits under the CPU socket shadow without forcing additional PCB layers.
推荐
Embedded Compute Module
Embedded COM-HPC and COM Express modules integrate the SI52208-A01AGM to provide reference clocks to the carrier board's PCIe lanes. Industrial temperature range (-40C to +85C) supports industrial automation and edge-compute deployments. The 8 outputs cover typical COM-HPC module PCIe lane counts (4-8 lanes per module), and I2C control enables the carrier BIOS to read the part's status registers for diagnostics. Low power consumption (approximately 90 mA at full load) is well within the thermal envelope of fan-less embedded systems.
推荐
FPGA-Based PCIe Acceleration Card
FPGA acceleration cards (AI inference, network processing, database acceleration) use the SI52208-A01AGM to deliver jitter-clean 100 MHz HCSL clocks to the FPGA's PCIe hard IP block and any external retimer. The 0.085 ps RMS Gen 6 jitter specification matches the FPGA PCIe Gen 4/5 hard IP reference-clock requirements with significant margin. The exposed thermal pad and 48-QFN package dissipate the 8-output full load without forced airflow, fitting the constrained airflow profile of a PCIe card. I2C control allows the FPGA firmware to dynamically enable/disable outputs based on PCIe link state.
推荐
推荐产品汇总
工程参考数据： SI52208-A01AGM ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SI52212-A01AGM | SI52204-A01AGM | SI52202-A01AGM | 9FGL0841CKILF | 9DBL0841BKILF |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions (formerly Silicon Labs) | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Renesas Electronics | Renesas Electronics |
| Package | 48-QFN (6x6) | 48-QFN (6x6) - same | 48-QFN (6x6) - same | 48-QFN (6x6) - same | 48-QFN (6x6) - same | 48-QFN (6x6) - same |
| Output Count | 8 HCSL pairs | 12 HCSL pairs | 4 HCSL pairs | 2 HCSL pairs | 8 HCSL pairs | 8 HCSL pairs |
| PCIe Compliance | Gen 1-6 + SRIS | Gen 1-6 + SRIS | Gen 1-6 + SRIS | Gen 1-6 + SRIS | Gen 1-5 | Gen 1-4 |
| Phase Jitter (RMS) | 0.085 ps (Gen 6) | 0.085 ps (Gen 6) | 0.085 ps (Gen 6) | 0.085 ps (Gen 6) | ~0.4 ps (Gen 5) | ~0.5 ps (Gen 4) |
| Spread Spectrum | Hardware SSEN + I2C | Hardware SSEN + I2C | Hardware SSEN + I2C | Hardware SSEN + I2C | I2C only | I2C only |
| VDD Core Supply | 1.5V-1.8V | 1.5V-1.8V | 1.5V-1.8V | 1.5V-1.8V | 3.3V | 3.3V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | 0C to +70C (commercial) |
| Approx. Unit Price (qty 1, USD) | $6.72 | $8.50 (est.) | $5.20 (est.) | $4.10 (est.) | $7.10 (est.) | $5.80 (est.) |
关键差异点
- PCIe Gen 6 jitter compliance with margin （对比 9FGL0841CKILF (Renesas))
- Family scalability within same footprint （对比 SI52204-A01AGM)
- Industrial temperature range across the family （对比 9DBL0841BKILF (Renesas))
设计说明
The Si52208-A01AGM requires two supply rails: VDD (1.5 V to 1.8 V) for the core logic and PLL, and VDDA (3.3 V) for the HCSL output drivers. Per the Skyworks datasheet, both rails should be decoupled with a 1 uF X7R ceramic plus a 0.1 uF X7R ceramic placed within 2 mm of the respective supply pins. Estimated: at full 8-output load, total supply current is approximately 90 mA on VDDA - budget for at least 100 mA when designing the 3.3 V LDO. Power sequencing is not required between VDD and VDDA per the datasheet, but VDDA should not be applied before VDD for more than 100 ms.
The 48-QFN exposed pad is the primary heat-dissipation path and MUST be soldered to a ground pad with at least nine 0.3 mm thermal vias arranged in a 3x3 grid for proper heat transfer to inner ground planes. Per the Skyworks datasheet, the device dissipates approximately 0.3 W at full load, and inadequate thermal pad soldering can raise junction temperature 25 C above ambient. HCSL output traces should be routed as 100 ohm differential pairs with intra-pair length matching within 5 mils to preserve the 0.085 ps RMS jitter budget.
Place the Si52208-A01AGM as close as practical to the PCIe slots/connectors it serves, with HCSL traces routed on the top microstrip layer over a continuous ground pour. Per the Skyworks datasheet typical layout, avoid routing HCSL signals across plane splits or near noisy power converter inductors - keep at least 5 mm clearance from switching node edges. Place the OE pull-up/pull-down resistors adjacent to the Si52208 to minimize stray capacitance on these control lines, which affects output enable/disable timing during PCIe link training.
Each HCSL output pair requires a 100 ohm differential termination to VTT (typically 0.7 V generated by the receiver side) at the receiver end. Per PCI-SIG CEM specification, the Si52208's current-mode drivers source approximately 14 mA of bias current, generating the HCSL-compliant 700 mVpp differential swing across the 100 ohm termination. Estimated: do NOT add source-series resistance unless the receiver requires pre-emphasis - the Si52208's output impedance is already designed for 50 ohm single-ended traces with 100 ohm differential termination.
Common pitfalls when designing with the SI52208-A01AGM: (1) Forgetting the exposed-pad solder connection causes the part to overheat and fail within minutes at full load. (2) Using 1.8 V VDDA instead of 3.3 V results in HCSL output swing below the PCI-SIG minimum. (3) Routing HCSL traces over a power plane split injects jitter and degrades the 0.085 ps RMS budget. (4) Leaving the SSEN pin floating enables random EMI behavior - either pull high or low explicitly. (5) Driving OE pins with logic voltages exceeding 3.6 V damages the input - use the Si52208's VDD rail as reference.
合规信息
RoHS compliant per Skyworks product page. Industrial temperature grade (-40C to +85C). Not AEC-Q100 qualified - this is a commercial/server timing IC, not an automotive part.
