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SI53112-A03AGM

SI53112-A03AGM

Skyworks Solutions Inc.
Intel QPI, PCI Express (PCIe), Server Clock Buffer IC 133.33MHz 1 Output 64-QFN (9x9)
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Overview

The SI53112-A03AGM is a high-performance 1:13 fanout clock buffer specifically designed for Intel QPI and PCI Express (PCIe) applications. It distributes a single clock input to 13 low-power HCSL differential outputs with a maximum frequency of 133.33MHz. The device is optimized for server environments where low jitter and precise timing are critical for high-speed data interconnects.

Why Choose This Part

The buffer features integrated termination resistors for 85 ohm differential transmission lines, significantly reducing external component count and PCB footprint. It supports SMBus programmability for fine-tuning performance and power management, while maintaining a low operating current of 18mA on the VDD rail in PLL mode.

Applications

Server Infrastructure
Distributes high-speed reference clocks across motherboards and backplanes for Intel QPI and PCIe Gen1/2/3/4/5 compliance.
Network Storage Systems
Provides synchronized clocking for RAID controllers and high-density storage arrays using HCSL signaling.
Enterprise Routing and Switching
Supports large-scale networking hardware requiring multiple synchronized 100MHz or 133MHz clock signals.

Key Specifications

PLL Yes
Input Clock
Output Clock, HCSL
Main Purpose Intel QPI, PCI Express (PCIe), Server
Mounting Type Surface Mount
Package / Case 64-VFQFN Exposed Pad
Frequency - Max 133.33MHz
Voltage - Supply 3.135V ~ 3.465V
Number of Circuits 1
Ratio - Input:Output 1:13
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 64-QFN (9x9)
Differential - Input:Output Yes/Yes

Getting Started

Designers should ensure the VDD supply remains within the 3.135V to 3.465V range and follow HCSL layout guidelines for 85 ohm impedance traces. Evaluation can be performed using Skyworks ClockBuilder Pro software to calculate configuration settings for the SMBus interface. Proper thermal grounding of the 64-QFN center pad is essential for stable operation at 133.33MHz.

Categories

Clocks & Timing > Clock Generators & PLLs