## Technical Overview: SI53112-A00AGMR The **SI53112-A00AGMR** is a high-performance, 1:2 low-power PCIe fanout buffer designed by Skyworks Solutions (formerly Silicon Labs). It is specifically engineered to distribute high-speed clocks for PCIe Gen1, Gen2, Gen3, and Gen4 applications with extremely low jitter. --- ### Key Specifications | Feature | Specification | | :--- | :--- | | **Function** | 1:2 Fanout Buffer | | **Output Type** | Low-Power HCSL (Host Clock Signal Level) | | **Clock Frequency** | 100 MHz (Optimized for PCIe) | | **Compliance** | PCIe Gen1, Gen2, Gen3, Gen4 | | **Additive Jitter** | 0.05 ps RMS (typical) | | **Supply Voltage** | 3.3V ± 5% | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | | **Package** | 8-TDFN (3x3 mm) | --- ### Functional Internal Blocks 1. **Input Stage:** Receives a single differential clock input (typically 100 MHz). 2. **Clock Distribution:** Internally splits the signal into two identical paths while maintaining phase alignment. 3. **Low-Power HCSL Drivers:** These outputs are designed to drive 85Ω or 100Ω transmission lines without the need for external termination resistors in most cases, reducing board space and power consumption. 4. **Control Logic:** Includes pins for enabling or disabling outputs (OE pins) to manage power consumption when specific clock branches are not needed. --- ### Pin Configuration Summary | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | **VDD** | 3.3V Power Supply | | 2 | **CLK_IN / CLK_INB** | Differential Input Clock | | 3 | **DIFF0 / DIFF0B** | Differential Output Pair 0 | | 4 | **DIFF1 / DIFF1B** | Differential Output Pair 1 | | 5 | **OE0 / OE1** | Output Enable Pins (Active High) | | 6 | **GND** | Ground | --- ### Part Number Breakdown: SI53112-A00AGMR - **SI53112**: Base part family (PCIe Fanout Buffer). - **A**: Product Revision. - **00**: Default configuration/device ID. - **A**: Temperature grade (Industrial -40 to 85°C). - **GM**: Package type (TDFN). - **R**: Shipping media (Tape and Reel). --- ### Application Usage This component is primarily used in environments where a single clock source must drive multiple PCIe devices (like NVMe drives, GPUs, or Network Interface Cards) without degrading signal integrity. Common applications include: * Servers and Storage Arrays. * Industrial Computing. * High-end Workstations. * Network Switches and Routers.