USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
2014 Microchip Technology Inc. DS00001701A-page 19
3.3 Buffer Type Descriptions
Table 3.3 Buffer Types
BUFFER TYPE DESCRIPTION
IS Schmitt-triggered input
I_RST Reset Input
I_SMB I
2
C/SMBus Clock Input
O8 Output with 8 mA sink and 8 mA source
OD8 Open-drain output with 8 mA sink
OD12 Open-drain output with 12 mA sink
PU 50 µA (typical) internal pull-up. Unless otherwise noted in the pin description, internal pull-
ups are always enabled.
Note: Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on
internal resistors to drive signals external to the device. When connected to a load
that must be pulled high, an external resistor must be added.
PD 50 µA (typical) internal pull-down. Unless otherwise noted in the pin description, internal
pull-downs are always enabled.
Note: Internal pull-down resistors prevent unconnected inputs from floating. Do not rely
on internal resistors to drive signals external to the device. When connected to a
load that must be pulled low, an external resistor must be added.
AIO Analog bi-directional
ICLK Crystal oscillator input pin
OCLK Crystal oscillator output pin
P Power pin
