USB97C100QFP datasheet(54/64 Pages) SMSC

54 / 64 page

SMSC DS – USB97C100

Page 54

Rev. 01/03/2001

PARAMETER

SYMBOL

CONDITIONS

(NOTE 1, 2)

MIN

TYP

MAX

UNIT

Capacitance

Transceiver Capacitance

CIN

Pin to GND

Terminals

Bus Pull-up Resistor on

Root Port

RPU

(1.5 K

Ω +/- 5%)

1.425

1.575

Ω

Bus Pull-down Resistor on

Downstream Port

RPD

(15 K

Ω +/- 5%)

14.25

15.75

Ω

Note 1: All voltages are measured from the local ground potential, unless otherwise specified.

Note 2: All timing use a capacitive load (CL) to ground of 50pF, unless otherwise specified.

Note 3: This is relative to VUSBIN.

Note 4: This is dependent on block configuration set by software.

Note 5: When the internal ring oscillator and waiting for first setup packet.

USB AC PARAMETERS

Full Speed: 4 to 20ns at CL = 50pF

Differential

Data Lines

10%

Rise Time

90%

Fall Time

10%

90%

FIGURE 5 - DATA SIGNAL RISE AND FALL TIME

Data Line

Crossover

Point

50% Point of

Initial Swing

VSS

Driver End

of Cable

Round Trip

Cable Delay

80ns (max)

Receiver

End of Cable

One Way

Cable

Delay

30ns

(max)

FIGURE 6 - CABLE DELAY

TPERIOD

Differential

Data Lines

Crossover

Points

Paired

Transitions

N * TPERIOD + TxJR2

Consecutive

Transitions

N * TPERIOD + TxJR1

FIGURE 7 - DIFFERENTIAL DATA JITTER

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