The **PCK2002PLP** is a high-performance, low-skew clock distribution device, specifically designed for desktop and server motherboards. It is part of the PCK family of integrated circuits (ICs) manufactured by NXP Semiconductors (formerly Philips). --- ### ## Technical Specifications The PCK2002PLP serves as a **fan-out buffer**, taking a single input clock signal and distributing it to multiple components with minimal timing distortion. | Parameter | Specification | | :--- | :--- | | **Device Type** | Clock Buffer / Driver | | **Number of Outputs** | 10 to 18 (depending on configuration) | | **Operating Voltage** | 3.3V (VCC) | | **Operating Frequency** | Up to 133 MHz | | **Skew (Output-to-Output)** | < 250 ps | | **Package Type** | TSSOP48 (Thin Shrink Small Outline Package) | | **Operating Temperature** | 0°C to 70°C | --- ### ## Core Electronic Components & Features ### 1. PLL (Phase-Locked Loop) Bypass While many clock drivers use internal PLLs to multiply frequencies, the PCK2002PLP often operates as a **non-PLL buffer**. This reduces "jitter" introduced by internal oscillators and ensures the output frequency is an exact 1:1 match of the input reference. ### 2. Output Enable (OE) Control The chip features dedicated pins to enable or disable specific banks of clock outputs. This is crucial for **power management**, allowing the system to shut down clocks to inactive hardware (like idle PCI slots) to save electricity. ### 3. Termination Resistors Internally, the outputs are designed to drive 50Ω transmission lines. However, to minimize signal reflections (which cause data errors), series termination resistors are typically required on the PCB traces connected to this IC. --- ### ## Common Applications The PCK2002PLP is primarily found in legacy hardware architectures and specialized industrial controllers: * **SDRAM Clocking:** Providing synchronized clock signals to multiple rows of memory modules. * **PCI Bus Buffering:** Distributing the 33MHz or 66MHz clock to various expansion slots. * **Embedded Computing:** Ensuring synchronized timing across different microprocessors on a single board. --- ### ## Pinout Overview (TSSOP48) | Pin Name | Description | | :--- | :--- | | **CLKIN** | The main reference clock input. | | **SDRAM [0:n]** | The distributed clock output pins for memory or logic. | | **OE** | Output Enable (Active High/Low depending on variant). | | **VDD / GND** | Power supply (3.3V) and Ground pins. |