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TUSB2040A Datasheet(PDF) 9 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
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
USB design notes
The following sections provide block diagram examples of how to implement the TUSB2040A device. Please
note, even though no resistors are shown, pull-up, pull-down and series resistors must still be used to properly
implement this device. Figure 1 shows a few resistors that must be used for the USB lines, and for a general
reference design, one is available on the TI USB web site.
Figure 6 is a block diagram example of how to connect the external EEPROM if configurable Product ID and
Vendor ID are desired. Please note that the pin numbers in Figure 6 are for the DIP package.
Figure 7 and 8 are examples of how to generate the 48-MHz clock signal. Figure 9 shows the EEPROM Read
Operation Timing Diagram. Figures 10, 11 and 12 illustrate how to connect the TUSB2040A device for different
power source and port power management combinations.
† Figures 7 and 8 are two examples of how to generate the 48-MHz clock signal.
DP0
DM0
SDA
TUSB2040A USB Hub
System
Power-On Reset
Regulator
Power
Switching
OVRCUR1 –
OVRCUR4
PWRON1 –
PWRON4
SCL
RESET
XTAL1
EXTMEM
VCC
GND
DP1 – DP4
DM1 – DM4
GND
Vbus
5 V GND
XTAL2
USB Data lines
and Power to
Downstream
Ports
Bus or Local Power
48-MHz Clock
Signal†
4
4
4
4
23
22
18
4
5
10
9
13, 27
6, 24
7, 11, 14, 16
3, 1, 26, 19
8, 12, 15, 17
2, 28, 25, 20
5
8
6
2
4
3
ORG
VCC
VSS
D
Q
C
S
1
EEPROM
3.3 V
1 k
21
‡ Pin numbers shown are for the N package.
Figure 6. Typical Application of the TUSB2040 USB Hub
XTAL1
220
XTAL2
Ceralock
Resonator
NOTE A: A simple way to achieve the required 48-MHz clock signal is to use a resonator such as the Ceralock™ resonator in Figure 7.
MuRata Electronics, Inc. manufactures a surface mount version, P/N CSACV48.00MXJ040, and a dip version, P/N
CSA48.00MXZ040. The 220
Ω resistor is used to tune the 48-MHz signal. The circuit functions properly without the capacitors,
but in order to decrease EMI emissions, the capacitors are used to decrease the amplitude of the signal. The exact values of the
capacitors are dependent on the capacitance of the board layout. Increasing the capacitance decreases the amplitude of the clock
signal. For the 4-layer PCB tested, 22 pF capacitors were used. If the capacitors are too large, the amplitude of the clock signal
will not be large enough for the successful numeration of the TUSB2040A by the USB host.
Figure 7. Resonator Clock Circuit
Ceralock is a trademark of MuRata Electronics Incorporated




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