NET2890 datasheet(67/73 Pages) ETC

67 / 73 page

Specification

NET2890 USB Interface Controller

____________________________________________________________________________________

NetChip Technology, Inc., 1999

335 Pioneer Way, Mountain View, California 94041

TEL (650) 526-1490

FAX (650) 526-1494

http://www.netchip.com

Rev 2.0, Draft 9, July 16, 1999

7.4.2 USB Port AC/DC Specification Notes

All voltages measured from the local ground potential, unless otherwise specified.

All timings use a capacitive load (CL) to ground of 50 pF, unless otherwise specified.

Full Speed timings have a 1.5 k

Ω pull-up to 3.3 V on the D+ data line.

Measured from 10% to 90% of the data signal.

The rising and falling edges should be smoothly transitioning (monotonic).

Timing difference between the differential data signals.

Measured at crossover point of differential data signals.

The maximum load specification is the maximum effective capacitive load allowed that meets the target

hub VBUS droop of 330 mV.

VDDC and IDDC refer to core power supply (pins designated VDD). VDDL and IDDL refer to local bus power

supply (pins designated VDDL(LOCAL)).

7.4.3 USB Port AC Waveforms

Differential

Data Lines

90%

10%

90%

10%

Rise Time

Fall Time

Full Speed: 4 to 20ns at C

L = 50pF

Figure 7-1. Data Signal Rise and Fall Time

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