Figure 9. LVPECL Differential Output Voltage and Rise/Fall Time
A. Output skew, tsk(o), is calculated as the greater of: The difference between the fastest and the slowest tpd(LH)n (n = 0...4) The difference between the fastest and the slowest tpd(HL)n (n = 0...4)
B. Pluse skew, tsk(p), is calculated as the magnitude of the absolute time difference between the high-to-low (tpd(HL)) and the low-to-high (tpd(LH)) propagation delays when a single switching input causes one or more outputs to switch, tsk(p) = |tpd(HL) – tpd(LH) |. Pulse skew is sometimes refered to as pulse width distortion or duty cycle skew.
Figure 10. Output Skew
Figure 11. Phase Offset
Figure 12. LVCMOS Output Loading During Device Test
Figure 13. LVPECL Output Loading During Device Test