Datasheet

TPS2044, TPS2054
QUAD POWER-DISTRIBUTION SWITCHES
SLVS174B – JULY 1998 – REVISED FEBRUARY 1999
22
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 33. Hybrid Self/Bus-Powered Hub Implementation
DP1
DM1
DP2
DM2
DP3
DM3
DP4
PWRON1
OVRCUR1
PWRON2
OVRCUR2
PWRON3
OVRCUR3
PWRON4
OVRCUR4
DM4
DP0
DM0
V
CC
XTAL1
XTAL2
OCSOFF
SN75240
D +
D –
5 V
GND
D +
D –
5 V
D +
D –
5 V
D +
D –
5 V
48-MHz
Crystal
Downstream
Ports
TUSB2040
Hub Controller
Tuning
Circuit
A
B
C
D
33 µF
†
SN75240
A
B
C
D
GND
GND
GND
33 µF
†
33 µF
†
33 µF
†
D +
D –
Upstream
Port
TPS2041
SN75240
A
B
5 V
GND
C
D
1 µF
IN
GND
Ferrite Beads
Ferrite Beads
Ferrite Beads
Ferrite Beads
BUSPWR
GANGED
Tie to TPS2041 EN
Input
OC EN
OUT
5 V Power
Supply
IN
GND
3.3 V
4.7 µF
0.1 µF
4.7 µF
EN1
IN1
OC1
OUT1
TPS2044
EN2
OC2
OUT2
0.1 µF
0.1 µF
GND
†
USB rev 1.1 requires 120 µF per hub.
EN3
OC3
OUT3
EN4
OC4
OUT4
IN2
GND1
GND2
TPS76333