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TUSB2043 Datasheet(PDF) 12 Page - Texas Instruments

Part No. TUSB2043
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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TUSB2043 Datasheet(HTML) 12 Page - Texas Instruments

 
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TUSB2043
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS308A – FEBRUARY 1999 – REVISED AUGUST 1999
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bus-powered hub, ganged port power management
When used in bus-powered mode, the TUSB2043 supports up to four downstream ports by controlling a
TPS2041 device capable of supplying 100 mA of current to each downstream port. Bus-powered hubs must
implement power switching to ensure current demand is held below 100 mA when the hub is hot-plugged into
the system. Utliizing the TPS2041 for ganged power management provides over-current protection for the
downstream ports. The SN75240 transient suppressors reduce inrush current and voltage spikes on the data
lines. The OVRCUR signals should be tied together for a ganged operation.
Figure 8. TUSB2043 Bus-Powered Hub, Ganged Port Power Management Application
† TPS2041 and SN75240 are Texas Instruments devices.
‡ 120
µF per hub is the minimum required per the USB specification, version 1.1. However, TI recommends a 100 µF low ESR tantulum capacitor
per port for immunity to voltage droop.
§ LDO is a 5 V to 3.3 V voltage regulator
DP1
DM1
DP2
DM2
DP3
DM3
DP4
PWRON1
PWRON2
PWRON3
PWRON4
OVRCUR1
OVRCUR2
OVRCUR3
OVRCUR4
DM4
DP0
DM0
VCC
CLKIN
MODESLCT
EXTMEM
RESET
SN75240†
EN
IN
OC
OUT
D +
D –
5 V
GND
D +
D –
5 V
D +
D –
5 V
D +
D –
5 V
Downstream
Ports
TUSB2043
TPS2041†
A
B
C
D
100
µF
SN75240†
A
B
C
D
GND
GND
GND
1
µF
100
µF
100
µF
100
µF
5 V
3.3 V
GND
D +
D –
Upstream
Port
3.3 V LDO§
SN75240†
A
B
5 V
GND
C
D
4.7
µF
0.1
µF
4.7
µF
GND
Ferrite Beads
Ferrite Beads
Ferrite Beads
Ferrite Beads
EEDATA/GANGED
48-MHz Clock
Source
BUSPWR
3.3 V
System
Power-On Reset
OUT
OUT
IN
3.3 V
1.5 k
3.3 V
0.1
µF
1 k
15 k
15 k
15 k
15 k
15 k
15 k
15 k
15 k


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