The **PL123E-05SC-R** is a high-performance, low-skew, low-jitter clock buffer designed for distributing clock signals in high-speed digital systems. It is manufactured by Microchip Technology (originally Micrel). --- ### 1. General Specifications | Feature | Details | | :--- | :--- | | **Function** | 1:5 Zero Delay Buffer (ZDB) | | **Input Frequency Range** | 10MHz to 220MHz | | **Output Frequency Range** | 10MHz to 220MHz | | **Operating Voltage** | 2.375V to 3.63V | | **Package Type** | SOIC-8 (Small Outline Integrated Circuit) | | **Operating Temperature** | Commercial (0°C to +70°C) | | **RoHS Compliant** | Yes (Suffix '-R' denotes Tape and Reel) | --- ### 2. Key Features and Architecture The PL123E-05SC-R is more than a simple buffer; it utilizes a **Phase-Locked Loop (PLL)** architecture to ensure signal integrity. * **Zero Delay:** The device synchronizes the output clocks with the input clock, resulting in near-zero propagation delay between the input and output pins. * **Low Skew:** It ensures that all five outputs transition at almost exactly the same time (typically <100ps skew), which is critical for synchronous timing in PCBs. * **Spread Spectrum Compatible:** It can pass through spread-spectrum signals without de-spreading them, making it useful for EMI (Electromagnetic Interference) reduction. * **Input/Output Ratios:** It provides five outputs that are a direct 1:1 ratio of the reference input frequency. --- ### 3. Pin Configuration (SOIC-8) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | REF | Reference Clock Input | | 2-3 | CLK1, CLK2 | Bank A Clock Outputs | | 4 | GND | Ground Connection | | 5-7 | CLK3, CLK4, CLK5 | Bank B Clock Outputs | | 8 | VDD | Power Supply (2.5V or 3.3V) | --- ### 4. Typical Applications This component is commonly found in networking and industrial hardware where clock distribution is required across multiple ICs: * **SDRAM/DDR Clock Buffering:** Distributing a single master clock to multiple memory modules. * **Network Switches/Routers:** Syncing data processing units. * **PCI/PCI-X Applications:** Managing high-speed bus timings. --- ### 5. Ordering Information Meaning The part number breaks down as follows: * **PL123E**: Product Family (Enhanced Low Jitter ZDB). * **-05**: Specific configuration (1:5 output ratio). * **S**: Package Code (SOIC). * **C**: Temperature Grade (Commercial). * **-R**: Packaging (Tape and Reel).