## ICS511M: LOCO™ PLL Clock Multiplier The **ICS511M** (produced by Renesas/IDT) is a low-cost, high-performance **Phase-Locked Loop (PLL)** clock multiplier. It is designed to replace expensive high-frequency crystals or oscillators by generating a high-speed output clock from a low-speed crystal or clock input. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Frequency Range** | 5 MHz to 27 MHz | | **Output Frequency Range** | Up to 200 MHz (at 5V) | | **Supply Voltage (VDD)** | 3.3 V to 5.0 V | | **Operating Current** | 12 mA (at 15 MHz input, 3.3V) | | **Package Type** | 8-pin SOIC | | **Duty Cycle** | 45% to 55% | --- ### 2. Functional Description The ICS511M uses an internal PLL to multiply the input frequency. The user selects the multiplication factor using two digital input pins (**S0** and **S1**). #### Multiplier Select Table | S1 Pin | S0 Pin | Multiplier Factor | | :---: | :---: | :---: | | 0 | 0 | 4x | | 0 | 1 | 5.25x | | 1 | 0 | 2x | | 1 | 1 | 3x | *Note: There are different versions of the ICS511; always check the specific suffix (e.g., M, MLF) for exact multiplier mappings.* --- ### 3. Pin Configuration (8-Pin SOIC) | Pin Number | Name | Type | Description | | :--- | :--- | :--- | :--- | | 1 | **ICLK** | Input | Crystal connection or external clock input. | | 2 | **X2** | Output | Crystal connection (leave floating if using external clock). | | 3 | **VDD** | Power | Positive supply voltage (3.3V or 5V). | | 4 | **GND** | Power | Ground. | | 5 | **CLK** | Output | Clock output. | | 6 | **S1** | Input | Multiplier select pin 1 (Internal pull-up). | | 7 | **S0** | Input | Multiplier select pin 0 (Internal pull-up). | | 8 | **OE** | Input | Output Enable (High = enable, Low = high impedance). | --- ### 4. Implementation Circuitry To ensure stability and low jitter, the following components are typically required: * **Decoupling Capacitor:** A 0.01 µF ceramic capacitor should be placed as close as possible to the VDD pin (Pin 3). * **Series Termination:** If the trace to the load is long, a 33Ω resistor should be placed in series with the CLK output (Pin 5) to minimize reflections. ```c // Example Logical Connection for 4x Multiplication // Input: 10 MHz Crystal // S1 = 0, S0 = 0 // Output: 40 MHz ``` ---