REN557M-01LF
Overview
The 557M-01LF is a high-performance clock source specifically designed for PCI Express applications. It generates a differential HCSL output pair from a standard 25MHz crystal input, eliminating the need for complex PLL circuitry. This 8-pin SOIC device provides a low-jitter, cost-effective solution for providing reference clocks to PCIe-compliant chipsets and expansion cards.
Why Choose This Part
The 557M-01LF features an Output Enable (OE) pin for power management and is available in industrial temperature grades for harsh environments. It supports a wide operating voltage range of 3.135V to 3.465V while maintaining a low supply current of 55mA under typical HCSL loading conditions.
Applications
Getting Started
Ensure a 25MHz fundamental mode crystal with appropriate load capacitance is placed close to the X1/X2 pins. For the HCSL outputs, use standard 50-ohm traces with proper termination resistors as specified in the datasheet to maintain signal integrity and PCIe compliance. The OE pin should be pulled high for normal operation or controlled by a GPIO for power sequencing.
