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VSC8221 Datasheet(PDF) 122 Page - Microsemi Corporation |
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VSC8221 Datasheet(HTML) 122 Page - Microsemi Corporation |
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122 / 138 page  VSC8221 Data Sheet VMDS-10106 Revision 4.1 December 2006 122 of 123 123 28.6 CLKOUT and CLKOUTMiCRO Timing The following specifications are valid only when the i/O power supply (VDDiO for CLKOUT and VDDiOMiCRO for CLKOUTMiCRO) is at either 3.3 V ±5%, or 2.5 V ±5%. . Figure 28. CLKOUT AC Timing Figure 29. CLKOUTMiCRO AC Timing Table 58. CLKOUT and CLKOUTMiCRO Timing Specifications Symbol Min Typ Max Unit Parameter Description & Conditions TCLKOUT 8 ns Clock period. TCLKOUTMiCRO 250 8 ns Clock period. Either: 4MHz or 125 MHz. FSTABiLiTY 100 ppm Clock frequency stability (0 °C to 70 °C). TDUTY 40 50 60 % Clock duty cycle. JCLK125 300 ps Total jitter of clock (peak-to-peak). tR/F (CLK125) 1 ns Clock rise time (20% to 80%). CLKOUT 80% 20% t R, tF T CLKOUT T DUTY CLKOUTMICRO 80% 20% t R, tF T CLKOUTMICRO T DUTY |
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