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MPC9446 датащи(PDF) 7 Page - Motorola, Inc |
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MPC9446 датащи(HTML) 7 Page - Motorola, Inc |
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7 / 12 page ![]() MPC9446 TIMING SOLUTIONS 7 MOTOROLA Figure 6. CCLK0,1 MPC9446 AC test reference for Vcc =3.3Vand Vcc =2.5V Pulse Generator Z= 50Ω RT =50Ω ZO =50Ω RT =50Ω ZO =50Ω MPC9446 DUT VTT VTT Figure 7. Output Transition Time Test Reference Figure 8. Propagation delay (tPD) test reference Figure 9. Output--to--output Skew tSK(LH, HL) Figure 10. Output Pulse Skew (tSK(P)) test reference tF tR VCC=3.3V VCC=2.5V 2.4 1.8V 0.55 0.6V VCC VCC÷2 GND VCC VCC÷2 GND t(LH) CCLK QX t(HL) The pin--to--pin skew is defined as the worst case difference in propagation delay between any two similar delay paths within a single device VCC VCC÷2 GND VCC VCC÷2 GND tSK(LH) tSK(HL) VCC VCC÷2 GND VCC VCC÷2 GND t(LH) CCLK QX t(HL) tSK(P) =| tPLH -- tPHL | Figure 11. Output Duty Cycle (DC) Figure 12. Cycle--to--cycle Jitter The time from the PLL controlled edge to the non controlled edge, divided by the time between PLL controlled edges, expressed as a percentage VCC VCC÷2 GND tP T0 DC = tP/T0 x 100% The variation in cycle time of a signal between adjacent cycles, over a random sample of adjacent cycle pairs TN TJIT(CC) = |TN--TN+1| TN+1 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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