A. Output skew, tsk(o), is calculated as the greater of: – The difference between the fastest and the slowest tPLHn (n = 1, 2,...10) – The difference between the fastest and the slowest tPHLn (n = 1, 2,...10)
B. Part-to-part skew, tsk(pp), is calculated as the greater of: – The difference between the fastest and the slowest tPLHn (n = 1, 2,...10) across multiple devices – The difference between the fastest and the slowest tPHLn (n = 1, 2,...10) across multiple devices
C. Pulse skew, tsk(p), is calculated as the magnitude of the absolute time difference between the high-to-low (tPHL) and the low-to-high (tPLH) propagation delays when a single switching input causes one or more outputs to switch, tsk(p) = | tPHL – tPLH |. Pulse skew is sometimes referred to as pulse-width distortion or duty-cycle skew.
Figure 2. Waveforms for Calculation of tsk(o) and tsk(pp)
Figure 3. Test Criteria for fclk, Duty Cycle, tr, tf, VOD
Figure 4. LVDS Output DC Configuration During Device Test
Figure 5. LVDS Output AC Configuration During Device Test
Figure 6. DC-Coupled LVCMOS Input During Device Test