The **9SQL4952CNLGI** is a high-performance, low-power clock generator/buffer designed primarily for PCIe (Peripheral Component Interconnect Express) applications. It belongs to the **Renesas (formerly IDT)** family of VL-Pro series clocking solutions. --- ### ## Technical Specifications Overview The following table summarizes the key electrical and physical characteristics of the 9SQL4952CNLGI: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Renesas Electronics | | **Function** | Low-power (LP) HCSL PCIe Clock Buffer / Synthesizer | | **Output Type** | 2-output Low-power HCSL (LP-HCSL) | | **PCIe Compatibility** | Gen1, Gen2, Gen3, Gen4, and Gen5 | | **Operating Voltage** | 3.3V (Nominal) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Type** | 24-VFQFPN (4x4 mm) | | **Core Power Consumption** | ~50mW (Highly efficient) | --- ### ### Key Components and Features 1. **Low-Power HCSL (LP-HCSL) Outputs:** The device provides two differential output pairs. Unlike traditional HCSL (Host Clock Signal Level) outputs that require external termination resistors to ground, LP-HCSL outputs integrate these resistors, reducing the Bill of Materials (BOM) and saving board space. 2. **Clock Synthesis & Buffering:** It can act as a "Zero Delay Buffer" (ZDB) or a "Fanout Buffer." It takes a reference clock input and distributes it to multiple components with minimal jitter, ensuring timing synchronization across high-speed data lanes. 3. **Jitter Performance:** Crucial for PCIe Gen5, this part features ultra-low additive phase jitter (typically < 0.1ps RMS), which is necessary to maintain signal integrity at data rates of 32 GT/s. 4. **SMBus Interface:** The part includes an SMBus (System Management Bus) interface, allowing developers to program specific output frequencies, enable/disable outputs, and manage power modes dynamically via software. --- ### ### Pin Configuration (Functional Groups) | Pin Group | Description | | :--- | :--- | | **VDD / GND** | Power supply (3.3V) and Ground pins. | | **CLKIN / CLKIN#** | Differential reference clock inputs. | | **OUT0 / OUT1** | Two sets of differential LP-HCSL output pairs. | | **SDA / SCL** | Data and Clock lines for SMBus configuration. | | **OE0# / OE1#** | Output Enable pins (active low) to manually toggle specific outputs. | --- ### ### Typical Application Diagram ```mermaid graph LR CPU[CPU/Chipset] -- Ref Clock --> 9SQL4952[9SQL4952 Buffer] 9SQL4952 -- Output 1 --> SSD[NVMe SSD] 9SQL4952 -- Output 2 --> GPU[Graphic Card / FPGA] SMBus[System Controller] -- Config --> 9SQL4952 ``` ---