## Overview of PL123-05SC-R The **PL123-05SC-R** is a high-performance, low-power, low-jitter clock multiplier and buffer IC manufactured by Microchip Technology (originally PhaseLink). It is designed to take a reference clock input and distribute it to multiple outputs with minimal phase noise. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Function** | Low Skew, 1:5 Output Clock Buffer / Multiplier | | **Input Frequency Range** | 10 MHz to 134 MHz | | **Output Frequency Range** | 10 MHz to 134 MHz | | **Operating Voltage (VDD)** | 2.5V to 3.3V (±10%) | | **Package Type** | SOP-8 (Standard Outline Package) | | **Output Type** | LVCMOS | | **Operating Temperature** | 0°C to +70°C (Commercial) | --- ### 2. Functional Description The PL123-05SC-R acts as a **Zero Delay Buffer (ZDB)**. It utilizes an internal Phase-Locked Loop (PLL) to synchronize the output clocks with the input reference clock. * **1:5 Fanout:** It takes one reference input and provides five identical clock outputs. * **Zero Delay:** The PLL ensures that the rising edge of the input clock aligns precisely with the rising edge of the output clocks, effectively eliminating propagation delay. * **Low Jitter:** It is optimized for high-speed designs where timing precision is critical (e.g., SDRAM, networking). --- ### 3. Pin Configuration (SOP-8) | Pin # | Symbol | Type | Description | | :--- | :--- | :--- | :--- | | 1 | REF | I | Reference Clock Input (10MHz - 134MHz) | | 2 | CLKOUT2 | O | Clock Output 2 | | 3 | CLKOUT3 | O | Clock Output 3 | | 4 | GND | P | Ground Connection | | 5 | CLKOUT4 | O | Clock Output 4 | | 6 | VDD | P | Power Supply (2.5V or 3.3V) | | 7 | CLKOUT1 | O | Clock Output 1 | | 8 | CLKOUT0 | O | Clock Output 0 (Usually used for feedback) | --- ### 4. Application Examples * **Motherboards & Servers:** Distributing a base clock to multiple peripherals. * **Networking Gear:** Switches and routers requiring synchronized data paths. * **Embedded Systems:** Replacing bulky oscillators with a single clock source distributed to various ICs. --- ### 5. Ordering Information Logic * **PL123:** Series number. * **05:** Specific configuration (1:5 fanout). * **S:** Package type (SOP). * **C:** Commercial temperature range. * **-R:** Shipped in Tape and Reel format.