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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 36 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
Fig 18. Receiver SE0 width tolerance.
handbook, halfpage
MGR872
differential
data lines
+3.3 V
0 V
t
FST
V
IH(min)
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 19. Hub differential data delay and SOP distortion.
h
andbook, full pagewidth
MGR777
SOP distortion:
t
SOP
= t
HDD
(next J)
− t
HDD(SOP)
(A) downstream hub delay (B) upstream hub delay
upstream
differential
data lines
hub delay
downstream
t
HDD
hub delay
upstream
t
HDD
downstream
differential
data lines
downstream
differential
data
upstream
differential
data
crossover
point
crossover
point
crossover
point
crossover
point
+3.3 V
0 V
+3.3 V
0 V