SLAT161 June   2022 HD3SS3411 , TMUXHS4412

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2What is PCI Express (PCIe)?
    1. 2.1 PCIe Link
    2. 2.2 PCIe Clocking Architectures
      1. 2.2.1 Common Reference Clock
      2. 2.2.2 Data Reference Clock
      3. 2.2.3 Separate Reference Clock
    3. 2.3 PCIe Reference Clock Specification
  5. 3Reference Clock Measurement With TI Multiplexers
    1. 3.1 Test Setup and Procedure
      1. 3.1.1 Test Setup
      2. 3.1.2 Test Procedure
    2. 3.2 Test Report
      1. 3.2.1 Test Result With Clock Source
      2. 3.2.2 Test Result With HD3SS3411
      3. 3.2.3 Test Result With TMUXHS4412
      4. 3.2.4 Test Result With TMUXHS221
  6. 4Summary

2.3 PCIe Reference Clock Specification

Table 2-2 shows the PCIe reference clock specification

Table 2-2 PCIe Reference Clock Specification
Parameter Min Max Unit
Frequency 99.97 100.03 Mhz
Absolute Max Input Voltage 1.15 V
Absolute Min Input Voltage -0.3 V
Crossing Voltage +250 +550 mV
Duty Cycle 40 60 %
Max Jitter (Gen1) 86 PS (Rms)
Max Jitter (Gen2) 3.1 PS (Rms)
Max Jitter (Gen3) 1.0 PS (Rms)
Max Jitter (Gen4) 1.0 PS (Rms)