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Application Note HCSL Reference Clocks - CTS Corp

Application Note HCSL Reference Clocks Author: John Metzler Applications Engineer T: 630-577-8816. CTS Corporation - United States Application Note HCSL Reference Clocks High Speed Current Steering Logic High Speed Current Steering Logic [HCSL] outputs are found in Peripheral Component Interconnect Express [PCIe] applications, Intel and Nvidia chipsets among others. HCSL is a differential output standard, similar to LVPECL, providing a high impedance output with fast switching times. Other advantages include aver- age power consumption when compared to LVDS and LVPECL and low phase jitter performance. Figure 1: External Resistors [50 ohm]. Terminated to Ground The differential output has a 15mA current source de- rived from an open emitter or source, with untermina- ted drains, that require external 50 ohm resistors ter- minated to ground.

ability; the PCIe electrical interface is be-ing used in ASICs, FPGAs and SoCs. This provides designers with flexible solutions for high speed data transfer in their sys-tems. The basic PCIe architecture consists of a data link between two devices that can have 1 to 32 lanes. The lanes are differentiated as x1, x2, x4, x8, x12, x16 and x32 PCIe ...

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