DSC557-0343FI0 - 100MHz PCIe MEMS Clock Generator | Microchip
料号： DSC557-0343FI0 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
DSC557-0343FI0 概述
What is a MEMS PCIe clock generator? A clock generator is a timing IC that produces one or more reference frequencies used to synchronize downstream logic such as CPU cores, PHYs, switches, and SerDes lanes. A MEMS (Micro-Electro-Mechanical Systems) clock generator replaces the traditional quartz crystal resonator with a silicon mechanical resonator built on standard CMOS processes, eliminating crystal aging, mechanical shock sensitivity, and the long lead times associated with quartz sourcing. In the PCIe ecosystem, a 100 MHz reference clock with stringent jitter and stability is required to drive PCIe PHYs in endpoints, root complexes, switches, and retimers.
Key features include a 100 ppm total frequency stability across temperature, low additive PCIe-compliant jitter, an Output Enable (OE) pin for power sequencing, HCSL or LVDS compatible differential outputs with a 52 % typical duty cycle, and supply voltage tolerance suitable for 3.3 V rails common in server, storage, and embedded designs. The 14-pin QFN package is 77 % smaller than the equivalent 16-pin TSSOP option, simplifying layout in space-constrained boards.
Architecturally, the device combines an on-chip MEMS resonator with a fractional-N PLL and an HCSL/LVDS driver. Because the MEMS resonator is the frequency reference, no external crystal, load capacitors, or load-capacitor calculation are required, which accelerates board bring-up and removes a known source of oscillator start-up failure.
Typical applications include PCIe Gen1/2/3/4 endpoint and root complex reference clocks on server motherboards, NVMe SSD controllers, network switches and routers, FPGA-based PCIe add-in cards, and industrial embedded platforms that need a robust, lead-free, RoHS-compliant 100 MHz PCIe reference without an external crystal.
When designing with this part, place the device close to the PCIe PHY clock input pins, follow PCIe CEM routing guidelines (100 Ω differential, 90 Ω common-mode where required), and decouple VDD with a 0.1 µF ceramic capacitor placed within 2 mm of the supply pin. Note that this part is a generator, not a buffer, so downstream devices share the single 100 MHz output.
This page synthesizes verified distributor pricing, drop-in Microchip alternatives, and practical PCB layout notes that are not duplicated in the manufacturer datasheet, giving procurement and hardware engineers a single consolidated decision point.
直接替换替代料： DSC557-0343FI0 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
DSC557-0343FI1
✅ 直接替换📋 参考替代料（不在目录中）
DSC557-0344FI1T
✅ 直接替换📋 参考替代料（不在目录中）
DSC557-0344FI0
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
DSC557-0343FI0T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
Si52144-A01AGM
✅ 直接替换📋 参考替代料（不在目录中）
9FGL0241AKILF
✅ 直接替换📋 参考替代料（不在目录中）
DSC557-0343FI0 规格参数
| Product Type | PCIe Clock Generator (MEMS) |
| Output Frequency | 100 MHz |
| 输出数量 | 1 |
| Frequency Stability (Total) | ±100 ppm |
| Output Format | HCSL / LVDS differential |
| Duty Cycle | 52 % typical |
| Supply Voltage (VDD) | 2.25 V to 3.6 V (3.3 V typical) |
| 工作温度 | -40 °C to +85 °C |
| 封装 | 14-QFN (2.5 mm × 3.2 mm) with EP |
| 安装类型 | Surface Mount |
| Output Enable (OE) Pin | Yes (active-high, disables outputs when low) |
| External Crystal Required | No (crystal-less MEMS resonator) |
| PCIe Compliance | Gen1 / Gen2 / Gen3 / Gen4 |
| RoHS 状态 | Compliant |
DSC557-0343FI0 引脚配置
| 引脚 1 | NC — Not connected (per datasheet) |
| 引脚 2 | NC — Not connected (per datasheet) |
| 引脚 3 | OE — Output Enable (active-high; low disables outputs) |
| 引脚 4 | GND — Ground |
| 引脚 5 | CLK- — Complementary differential clock output |
| 引脚 6 | CLK+ — True differential clock output (100 MHz HCSL/LVDS) |
| 引脚 7 | VDD — Power supply (2.25 V to 3.6 V, 3.3 V typical) |
| 引脚 8 | NC — Not connected (per datasheet) |
| 引脚 9 | NC — Not connected (per datasheet) |
| 引脚 10 | NC — Not connected (per datasheet) |
| 引脚 11 | NC — Not connected (per datasheet) |
| 引脚 12 | NC — Not connected (per datasheet) |
| 引脚 13 | NC — Not connected (per datasheet) |
| 引脚 14 | EP — Exposed pad - thermal and ground connection (must be soldered to GND plane) |
典型应用
DSC557-0343FI0 适用于 6 应用s: PCIe Gen4 Endpoint Reference Clock, Server and Storage Motherboard Clock Distribution, FPGA-Based PCIe Add-in Card, Network Switch and Router Line Card, Industrial Embedded Computing Platform, Test and Measurement Instrumentation Backplane.
PCIe Gen4 Endpoint Reference Clock
The DSC557-0343FI0 supplies the 100 MHz differential reference clock required by a PCIe Gen1/2/3/4 endpoint PHY on add-in cards, NVMe SSDs, or network interface cards. Its ±100 ppm stability and PCIe-compliant jitter ensure the PHY meets the Gen4 16 GT/s eye mask without reference-clock-induced link errors. Place the device within 25 mm of the PHY clock pins, route CLK+/CLK- as a 100 Ω differential pair, and tie OE high for normal operation or low for power-saving disablement.
推荐
Server and Storage Motherboard Clock Distribution
On server motherboards and storage backplanes, the DSC557-0343FI0 acts as a local 100 MHz PCIe reference for chipset PHYs, BMC chips, and NVMe controller links. Because it is crystal-less and operates from 2.25-3.6 V, it integrates seamlessly into 3.3 V clock trees and removes the BOM risk of crystal sourcing variability. Multiple instances can be placed across the board to isolate clock domains and minimize long stub traces that would otherwise degrade PCIe signal integrity.
推荐
FPGA-Based PCIe Add-in Card
FPGA add-in cards implementing PCIe endpoints require a precise 100 MHz reference for the integrated hard PCIe IP block. The DSC557-0343FI0's HCSL/LVDS differential output directly drives the FPGA's clock input pair without additional buffering for short PCB routes, while its MEMS-based stability avoids the frequency drift that would otherwise cause PCIe link training failures. The 14-QFN 2.5×3.2 mm footprint fits easily under the FPGA heat spreader keep-out area.
推荐
Network Switch and Router Line Card
In network switches and routers, each line card typically hosts one or more PCIe links to the switch ASIC, and the DSC557-0343FI0 provides the local 100 MHz reference for these SerDes links. Its industrial -40 °C to +85 °C range supports deployment in NEBS-compliant telecom environments, and the OE pin enables software-controlled clock gating during low-power states. The 2.5×3.2 mm QFN footprint keeps the clock source close to the ASIC to minimize trace length and impedance discontinuities.
推荐
Industrial Embedded Computing Platform
Industrial PCs, edge gateways, and HMI controllers use the DSC557-0343FI0 to generate a robust PCIe reference for accelerators and storage devices, where quartz crystals would be vulnerable to shock and vibration in factory-floor installations. The MEMS resonator's inherent tolerance to mechanical stress delivers more consistent PCIe link uptime, and the wide 2.25-3.6 V supply tolerance accommodates the loosely regulated rails typical of industrial power systems.
推荐
Test and Measurement Instrumentation Backplane
ATE chassis and modular instrumentation platforms route PCIe between instrument modules, and the DSC557-0343FI0 provides a per-module 100 MHz reference that is electrically isolated from chassis-wide clock noise. Its low-jitter HCSL output preserves PCIe Gen3/Gen4 link margin even across long backplane connectors, and the exposed-pad QFN efficiently spreads heat in densely populated modules. The OE pin enables per-module power-down during calibration cycles to reduce system noise.
推荐
推荐产品汇总
工程参考数据： DSC557-0343FI0 ——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 | DSC557-0343FI1 | DSC557-0344FI1T | DSC557-0344FI0 | Si52144-A01AGM | 9FGL0241AKILF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Silicon Labs | Renesas Electronics |
| Package | 14-QFN (2.5x3.2 mm) | 14-QFN (2.5x3.2 mm) - same | 14-QFN (2.5x3.2 mm) - same | 14-QFN (2.5x3.2 mm) - same | 14-QFN (2.5x3.2 mm) - same | 14-QFN (2.5x3.2 mm) - same |
| Output Frequency | 100 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz | 100 MHz |
| PCIe Generation | Gen1 / Gen2 / Gen3 / Gen4 | Gen1 / Gen2 / Gen3 / Gen4 | Gen1 / Gen2 / Gen3 / Gen4 | Gen1 / Gen2 / Gen3 / Gen4 | Gen1 / Gen2 / Gen3 / Gen4 | Gen1 / Gen2 / Gen3 / Gen4 |
| Output Format | HCSL / LVDS differential | HCSL / LVDS differential | HCSL / LVDS differential | HCSL / LVDS differential | HCSL differential | HCSL differential |
| Frequency Stability | ±100 ppm | ±100 ppm | ±100 ppm | ±100 ppm | ±100 ppm | ±100 ppm |
| Supply Voltage | 2.25 V to 3.6 V | 2.25 V to 3.6 V | 2.25 V to 3.6 V | 2.25 V to 3.6 V | 2.5 V / 3.3 V | 3.3 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
关键差异点
- Crystal-less MEMS resonator eliminates external quartz （对比 Traditional PCIe crystal oscillator (e.g. discrete 100 MHz HCSL oscillator))
- 77 % smaller PCB footprint than TSSOP alternative （对比 DSC557-03 in 16-pin TSSOP variant)
- Pin-compatible cross-brand drop-in options （对比 Single-vendor lock-in for PCIe clock generators)
设计说明
Place the DSC557-0343FI0 within 25 mm of the PCIe PHY clock input pins and route CLK+/CLK- as a tightly coupled 100 Ω differential pair with no more than two vias on the CLK+ trace. Per the Microchip DSC557-03 datasheet, this minimizes reflections and preserves the PCIe Gen4 jitter margin across the reference clock path.
Decouple VDD with a 0.1 µF X7R ceramic capacitor placed within 2 mm of pin 7, plus a bulk 1 µF capacitor nearby to handle transient current when the HCSL output transitions. The exposed pad (pin 14) must be soldered to a continuous ground plane to provide both the ground reference and the primary thermal path.
Do not leave the OE pin floating - tie it high through a 10 kΩ resistor for normal operation or drive it from the host SoC's GPIO for power sequencing. A floating OE pin can cause intermittent output disable, leading to PCIe link training failures that are difficult to diagnose. Also avoid routing CLK+/CLK- near switching regulator inductors or noisy digital buses to prevent coupled jitter.
合规信息
RoHS and REACH compliant per Microchip product page. AEC-Q100 is not applicable for this commercial/industrial timing IC; choose an AEC-Q100-qualified timing part if automotive design is required. Halogen-free status was not stated in the verified data.
