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AM79C874VC 数据表(PDF) 46 Page - Advanced Micro Devices |
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AM79C874VC 数据表(HTML) 46 Page - Advanced Micro Devices |
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46 / 60 page ![]() 46 Am79C874 P R E L I M INARY SWITCHING CHARACTERISTICS Note: Parametric values are the same for commercial devices and industrial devices. System Clock Signal Figure 14. Clock Signal MLT-3 Signals Figure 15. MLT-3 Test Waveform Symbol Parameter Description Min. Max. Unit tCLK REFCLK Period 39.998 40.002 ns tCLKH REFCLK Width HIGH 18 22 ns tCLKL REFCLK Width LOW 18 22 ns tCLR REFCLK Rise Time - 5 ns tCLF REFCLK Fall Time - 5 ns Symbol Parameter Description Min. Max. Unit tTXR Rise Time of MLT-3 Signal 3.0 5.0 ns tTXF Fall Time of MLT-3 Signal 3.0 5.0 ns tTXRFS Rise Time and Fall Time Symmetry of MLT-3 Signal - 5 % tTXDCD Duty Cycle Distortion Peak to Peak - 0.5 ns tTXJ Transmit Jitter Using Scrambled Idle Signals - 1.4 ns tCLR 80% 20% tCLF tCLKH tCLKL tCLK REFCLK 22235I-16 tTXR tTXF 16 ns TX ± tXTDCD tXTDCD 1 0 1 0 1 0 1 22235I-17 |
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