USB97C100QFP datasheet(55/64 Pages) SMSC

55 / 64 page

SMSC DS – USB97C100

Page 55

Rev. 01/03/2001

TPERIOD

Differential

Data Lines

Crossover

Point

Crossover

Point Extended

Source EOP Width:

TEOPT

Receiver EOP Width: TEOPR1, TEOPR2

Diff. Data to

SE0 Skew

N * TPERIOD + TDEOP

FIGURE 8 - DIFFERENTIAL TO EOP TRANSITION SKEW AND EOP WIDTH

Differential

Data Lines

Paired

Transitions

N * TPERIOD + TJR2

TPERIOD

Consecutive

Transitions

N * TPERIOD + TJR1

TJR

TJR1

TJR2

FIGURE 9 - RECEIVER JITTER TOLERANCE

Table 87 - Full Speed (12Mbps) Source Electrical Characteristics

PARAMETER

SYM

CONDITIONS

(NOTE 1, 2, 3)

MIN

TYP

MAX

UNIT

DRIVER CHARACTERISTICS:

Transition Time:

Rise Time

Fall Time

Note 4,5 and FIGURE 5

CL = 50 pF

Rise/Fall Time Matching

TRFM

(TR/TF)

110

Output Signal Crossover

Voltage

VCRS

1.3

2.0

Drive Output Resistance

ZDRV

Steady State Drive

Ω

DATA SOURCE TIMING:

Full Speed Data Rate

TDRATE

Ave. Bit Rate

(12 Mb/s +/- 0.25%) Note

11.95

12.03

Mbs

Frame Interval

TFRAME

1.0 ms +/- 0.05%

0.999

1.000

Clock Period

TPERIO

Source Differential Driver

Jitter

To next Transition

For Paired Transitions

TDJ1

TDJ2

Note 6, 7 and

FIGURE 7

-3.5

-4.0

3.5

4.0

Source EOP Width

TEOPT

Note 7 and

FIGURE 8

160

175

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