USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
Table 2.4 USB Pins (continued)
BUFFER
NUM
PINS
NAME
SYMBOL
TYPE
DESCRIPTION
USB Port Power
Control 2
PRTCTL2
PRTCTL3
PRTCTL4
PRTCTL5
IS/OD12 When used as an output, this pin enables power to
(PU)
downstream USB peripheral 2.
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 2. An overcurrent
condition is indicated when the signal is low.
1
Refer to Section 2.1 for additional information.
USB Port Power
Control 3
IS/OD12 When used as an output, this pin enables power to
downstream USB peripheral 3.
(PU)
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 3. An overcurrent
condition is indicated when the signal is low.
1
1
1
Refer to Section 2.1 for additional information.
USB Port Power
Control 4
IS/OD12 When used as an output, this pin enables power to
downstream USB peripheral 4.
(PU)
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 4. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
USB Port Power
Control 5
IS/OD12 When used as an output, this pin enables power to
downstream USB peripheral 5.
(PU)
When used as an input, this pin is used to sample
the output signal from an external current monitor
for downstream USB peripheral 5. An overcurrent
condition is indicated when the signal is low.
Refer to Section 2.1 for additional information.
External USB
Bias Resistor
USBRBIAS
VDD18USBPLL
XI
AI
P
Used for setting HS transmit current level and on-
chip termination impedance. Connect to an
external 12K 1.0% resistor to ground.
1
1
USB PLL +1.8V
Power Supply
Refer to the LAN9514/LAN9514i reference
schematics for additional connection information.
Crystal Input
ICLK
External 25 MHz crystal input.
Note:
This pin can also be driven by a single-
ended clock oscillator. When this method
is used, XO should be left unconnected
1
1
Crystal Output
XO
OCLK
External 25 MHz crystal output.
SMSC LAN9514/LAN9514i
Revision 1.0 (11-24-09)
DATA1S3HEET
SMSC [ SMSC CORPORATION ]
