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TUSB2040A Datasheet(PDF) 6 Page - Texas Instruments

Part No. TUSB2040A
Description  4-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
differential driver switching characteristics over recommended ranges of operating free-air
temperature and supply voltage, CL = 50 pF unless otherwise noted (see Figures 1 and 2)
full speed mode
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
tr
Transition rise time for DP or DM
See Figure 1 and Figure 2
4
20
ns
tf
Transition fall time for DP or DM
See Figure 1 and Figure 2
4
20
ns
t(RFM)
Rise/fall time matching
(tr/tf) x 100
90
110
%
VO(CRS) Signal crossover output voltage
1.3
2.0
V
low speed mode
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
tr
Transition rise time for DP to DM
CL = 50 pF to 350 pF,
See Figure 1 and Figure 2
75
300
ns
tf
Transition fall time for DP to DM
CL = 50 pF to 350 pF,
See Figure 1 and Figure 2
75
300
ns
t(RFM)
Rise/fall time matching
(tr/tf) x 100
80
120
%
VO(CRS) Signal crossover output voltage
CL = 50 pF to 350 pF
1.3
2.0
V
CL
15 k
15 k
CL
Full
Low
V(TERM) = 2.8 V
1.5 k
DP
DM
22
22
Characterization
measurement point
Figure 1. Differential Driver Switching Load
tr
90%
10%
VOH
VOL
DM
DP
90%
10%
tf
Figure 2. Differential Driver Timing Waveforms




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