HD3SS6126_14 Datasheet, PDF (8/17 Pages) Texas Instruments – USB 3.0 and USB 2.0 Differential Switch 2:1/1:2 MUX/DEMUX

HD3SS6126
SLAS975 – NOVEMBER 2013
Vcc
A(p)
B/C(p)
50 Ω
50 Ω
B/C(p)
A(p)
A(n)
B/C(n)
50 Ω
C/B (p)
C/B (n)
A (p)
A (n)
50%
50%
t_P1
SEL
50%
50 Ω
50%
t_P2
Inter-pair skew
t_PD = Max(t_p1, t_p2)
t_SK(O) = Difference between t_PD for any
two pairs of outputs
B/C(n)
A(n)
t₁
t₂
t₃
t₄
C/B/A (p)
50%
C/B/A (n)
C/B/A (p)
t_SK(O)
C/B/A (n)
Intra-pair skew
t_SK(b-b) = 0.5 X |(t₄ – t₃) + (t₁ – t₂)|
NOTES:
1. Measurements based on an ideal input with zero intra-pair skew on
the input, i.e. the input at A to B/C or the input at B/C to A
2. Inter-pair skew is measured from lane to lane on the same channel,
e.g. C0 to C1
3. Intra-pair skew is defined as the relative difference from the p and n
signals of a single lane
Figure 3. Propagation Delay and Skew
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