HD3SS2521 datasheet(13/20 Pages) TI2

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50%

tP1

tP2

tSK(O)

= Difference between t

PD for any

two pairs of outputs

tSK(b-b) = 0.5 X |(t 4 – t 3) + (t 1 – t 2)|

50 Ω

Bx/Cx(p)

Ax(p)

50 Ω

Bx/Cx(n)

Ax(n)

SEL

Vcc

Cx/Bx (p)

Cx/Bx (n)

50%

tSK(O)

tPD = Max(tp1, t p2)

Bx/Cx(p)

Bx/Cx(n)

Ax(p)

Ax(n)

Ax (p)

Ax (n)

DCx/DBx/DAx (p)

Cx/Bx/Ax (n)

Cx/Bx/Ax (p)

Cx/Bx/Ax (n)

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

Intra-pair skew

Inter-pair skew

VOUT

90%

10%

50%

Ton

Toff

HS_SEL_IN/SS_SEL_IN

HD3SS2521

www.ti.com

SLAS941A – APRIL 2013 – REVISED MAY 2013

TEST TIMING DIAGRAMS

Figure 4. Select to Switch Ton and Toff

Figure 5. Propagation Delay and Skew

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