Philips ISP1122A Product Data page 36

Philips Semiconductors
Fig 18. Receiver SE0 width tolerance.
+3.3 V
upstream
differential
data lines
0 V
+3.3 V
downstream
differential
data lines
0 V
(A) downstream hub delay
SOP distortion:
t SOP = t HDD (next J) − t HDD(SOP)
Full-speed timing symbols have a subscript prefix 'F', low-speed timings a prefix 'L'.
Fig 19. Hub differential data delay and SOP distortion.
9397 750 08958
Product data
+3.3 V
differential
data lines
0 V
crossover
point
hub delay
downstream
t HDD
crossover
point
Rev. 03 — 30 October 2001
t FST
V IH(min)
MGR872
crossover
downstream
point
differential
data
hub delay
upstream
t HDD
upstream
differential
data
(B) upstream hub delay
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
ISP1122A
USB stand-alone hub
crossover
point
MGR777
36 of 48