MAX4906 Maxim, MAX4906 Datasheet - Page 12

• Manufacturer Part Number: MAX4906
• Description: The MAX4906/MAX4906F/MAX4907/MAX4907F analog switches combine the low on-capacitance (CON) and low on-resistance (RON) necessary for high-performance switching applications
• Manufacturer: Maxim

High-/Full-Speed USB 2.0 Switches
ideal for routing USB data lines (see Figure 7) and for
applications that require switching between multiple
USB hosts (see Figure 8). The MAX4907/MAX4907F
can be used in applications that require different data
types to share the same pins (see Figure 9); however,
the shared device must be capable of going into the tri-
state mode. The MAX4906F/MAX4907F also feature
+5.5V fault protection to guard systems against shorts
to the USB bus voltage. The fault-protected versions
are recommended for all USB applications.
Figure 7. MAX4906/MAX4906F USB Data Routing
Figure 8. MAX4906/MAX4906F Switching Between Multiple
USB Hosts
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______________________________________________________________________________________
TRANSCEIVER
TRANSCEIVER
ASIC II
ASIC I
TRANSCEIVER
USB
USB
USB
D+
D+
D-
D-
COM1
COM2
MAX4906F
NC1
NO1
NC2
NO2
MAX4906/
MAX4906F
MAX4906/
NC1
NO1
NC2
NO2
COM1
COM2
USB
USB
USB
USB
V
GND
BUS
D+
0
1
0
1
D-
+
+
-
-
CONNECTOR
USB
The wide bandwidth of the MAX4906/MAX4906F/
MAX4907/MAX4907F meets the needs of 10/100 Ethernet
switching. These devices switch the signals from two
interface transformers and connect the signals to a single
10/100 Base-T Ethernet PHY, simplifying docking station
design and reducing manufacturing costs.
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals, especially if the analog signal is not
current limited.
High-speed switches require proper layout and design
procedures for optimum performance. Keep design-
controlled-impedance PC board traces as short as pos-
sible. Ensure that bypass capacitors are as close to the
device as possible. Use large ground planes where
possible.
Figure 9. MAX4907/MAX4907F USB/SPI/GPIO Switch
SPI/GPIO
DEVICE
CLOCK
DATA
EN
DATA PINS
SHARED
TRI-STATE
ENABLE
Power-Supply Sequencing
NO1
NO2
MAX4907F
MAX4907/
Ethernet Switching
COM1
COM2
TRANSCEIVER
Layout
USB