The **PL135-27GI-R** is a high-performance, low-power **Crystal-to-LVCMOS Clock Generator** (specifically an oscillator buffer/translator) manufactured by Microchip Technology (formerly PhaseLink). It is designed to convert a standard crystal input into a high-quality LVCMOS output. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Frequency** | 10MHz to 45MHz (Fundamental Crystal) | | **Output Type** | LVCMOS (Single-ended) | | **Supply Voltage (VDD)** | 1.62V to 3.63V | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Output Current** | 4mA to 8mA (Depending on VDD) | | **Package Type** | SOT-23-6L | | **RoHS Status** | Green / RoHS Compliant | --- ### 2. Core Functional Parts The internal architecture of the PL135-27GI-R consists of three main stages: 1. **Crystal Oscillator Circuit:** This block interfaces directly with an external fundamental parallel-resonant crystal. It features an integrated internal load capacitance, which simplifies the PCB design by reducing the need for external capacitors. 2. **Output Buffer:** A high-speed, low-noise CMOS buffer that converts the sinusoidal oscillation of the crystal into a square-wave LVCMOS output. 3. **OE (Output Enable) Logic:** This pin allows the system to enable or disable the clock output. When the OE pin is Low, the output goes into a High-Impedance (Hi-Z) state, which is critical for power-saving modes. --- ### 3. Pin Configuration (SOT-23-6) | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **OE** | Output Enable. Internal pull-up. High = Enabled; Low = Hi-Z. | | 2 | **GND** | Ground Connection. | | 3 | **XIN** | Crystal Input or External Reference Clock. | | 4 | **XOUT** | Crystal Output Connection. | | 5 | **VDD** | Power Supply (1.8V, 2.5V, or 3.3V). | | 6 | **CLK** | LVCMOS Clock Output. | --- ### 4. Applications The PL135-27GI-R is primarily used in space-constrained applications where a stable clock reference is needed without the bulk of a full-sized oscillator module. Common uses include: * Portable medical devices. * Smartphones and Tablets. * Set-top boxes and Digital TVs. * Embedded IoT sensors. --- ### 5. Part Number Breakdown * **PL135-27**: Base part number for the Low Power Oscillator. * **G**: Green / Lead-Free package. * **I**: Industrial temperature range (-40°C to +85°C). * **R**: Tape and Reel packaging.