ISP1122ABD datasheet(35/48 Pages) PHILIPS

35 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

35 of 48

9397 750 06986

TPERIOD is the bit duration corresponding with the USB data rate.

Fig 15. Source differential data jitter.

handbook, full pagewidth

MGR870

TPERIOD

differential

data lines

crossover point

consecutive

transitions

× TPERIOD + tDJ1

paired

transitions

× TPERIOD + tDJ2

+3.3 V

0 V

TPERIOD is the bit duration corresponding with the USB data rate.

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timings a preﬁx ‘L’.

Fig 16. Source differential data-to-EOP transition skew and EOP width.

handbook, full pagewidth

MGR776

TPERIOD

differential

data lines

crossover point

differential data to

SE0/EOP skew

× TPERIOD + tDEOP

source EOP width: tEOPT

receiver EOP width: tEOPR

crossover point

extended

+3.3 V

0 V

TPERIOD is the bit duration corresponding with the USB data rate.

Fig 17. Receiver differential data jitter.

handbook, full pagewidth

MGR871

TPERIOD

tJR

differential

data lines

consecutive

transitions

× TPERIOD + tJR1

paired

transitions

× TPERIOD + tJR2

+3.3 V

0 V

tJR1

tJR2

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