CDC391
1-LINE TO 6-LINE CLOCK DRIVER
WITH SELECTABLE POLARITY AND 3-STATE OUTPUTS
SCAS334A – DECEMBER 1992 – REVISED NOVEMBER 1995
PARAMETER MEASUREMENT INFORMATION
A
1T/C
1Y1
tPLH1
1Y2
tPLH2
2T/C
tPHL2
tPLH6
tPHL6
tPHL1
tPLH5
tPHL5
2Y1
tPLH3
2Y2
tPLH4
tPHL4
tPHL8
tPLH8
tPHL3
tPHL7
tPLH7
NOTES: A. Output skew, tsk(o), from A to any Y (same phase), can be measured only between outputs for which the respective polarity-control
inputs (T/C) are at the same logic level. It is calculated as the greater of:
– The difference between the fastest and slowest of tPLH from A↑ to any Y (e.g., tPLHn, n = 1 to 4; or tPLHn, n = 5 to 6)
– The difference between the fastest and slowest of tPHL from A↓ to any Y (e.g., tPHLn, n = 1 to 4; or tPHLn, n = 5 to 6)
– The difference between the fastest and slowest of tPLH from A↓ to any Y (e.g., tPLHn, n = 7 to 8)
– The difference between the fastest and slowest of tPHL from A↑ to any Y (e.g., tPHLn, n = 7 to 8)
B. Output skew, tsk(o), from A to any Y (any phase), can be measured between outputs for which the respective polarity-control inputs
(T/C) are at the same or different logic levels. It is calculated as the greater of:
– The difference between the fastest and slowest of tPLH from A↑ to any Y or tPHL from A↑ to any Y (e.g., tPLHn, n = 1 to 4;
or tPLHn, n = 5 to 6, and tPHLn, n = 7 to 8)
– The difference between the fastest and slowest of tPHL from A↓ to any Y or tPLH from A↓ to any Y (e.g., tPHLn, n = 1 to 4;
or tPHLn, n = 5 to 6, and tPLHn, n = 7 to 8)
Figure 2. Waveforms for Calculation of t
sk(o)
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