TUSB2043

4-PORT HUB FOR THE UNIVERSAL SERIAL BUS

WITH OPTIONAL SERIAL EEPROM INTERFACE

SLLS308A – FEBRUARY 1999 – REVISED AUGUST 1999

7

POST OFFICE BOX 655303

CL

15 k

Ω

15 k

Ω

CL

Full

Low

V(TERM) = VCC

1.5 k

Ω

DP

DM

22

Ω

22

Ω

Characterization

measurement point

Figure 1. Differential Driver Switching Load

90%

10%

tr

90%

10%

VOH

VOL

DM

DP

tf

90%

10%

tr

10%

tf

90%

NOTE: The tr/tf ratio is measured as tr(DP)/tf(DM) and tr(DM)/tf(DP) at each crossover point.

Figure 2. Differential Driver Timing Waveforms

0.5

0

01

2

1

1.5

34

VICR – Common Mode Input Range – V

0.8

3.6

0.2

1.3

2.5

Figure 3. Differential Receiver Input Sensitivity vs Common Mode Input Range

Vhys

VIT+

VIT–

VCC

VIH

VIL

0 V

Logic high

Logic low

Figure 4. Single-Ended Receiver Input Signal Parameter Definitions