PDIUSBH12D datasheet(21/28 Pages) PHILIPS

21 / 28 page

Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

AC CHARACTERISTICS (AI/O pins, LOW speed)

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

Driver characteristics

CL = 50pF and 350pF;

Rpu = 1.5kΩ on D– to VCC

Transition Time

Between 10% and 90%

Rise time

CL = 50pF

tlr

Rise time

CL = 350pF

300

t f

Fall time

CL = 50pF

tlf

Fall time

CL = 350pF

300

tRFM

Rise/fall time matching

(tr/tf)

120

VLCRS

Output signal crossover voltage

1.3

2.0

Driver Timings

tLEOPT

Source EOP width

Figure 1

1.25

1.50

µs

tLDEOP

Differential data to EOP transition skew

Figure 1

–40

100

Receiver Timings

EOP Width at Receiver

tLEOPR1

Must reject as EOP

Figure 1

330

tLEOPR2

Must accept

Figure 1

675

Hub Timings

Low Speed downstream port.

tLHDD

Hub Differential Data Delay

Figure 2

300

tLSOP

Data bit width distortion after SOP

Figure 2

–65

tLEOPDR

Hub EOP Delay Relative to THDD

Figure 3

200

tLHESK

Hub EOP Output Width Skew

Figure 3

–300

+300

SV00837

tPERIOD

DIFFERENTIAL

DATA LINES

CROSSOVER POINT

EXTENDED

DIFFERENTIAL DATA TO

SEO/EOP SKEW

N * tPERIOD + tDEOP

SOURCE EOP WIDTH: tEOPT

RECEIVER EOP WIDTH: tEOPR1, tEOPR2

Figure 1. Differential data to EOP transition skew and EOP width

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