USB5744
DS00001855E-page 14
2015-2017 Microchip Technology Inc.
3.3
Buffer Types
TABLE 3-8:
BUFFER TYPES
Buffer Type
Description
I
Input
IS
Schmitt-triggered input
O6
Output with 6 mA sink and 6 mA source
O12
Output with 12 mA sink and 12 mA source
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.
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.
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.
IO-U
Analog input/output as defined in USB specification
AI
Analog input
ICLK
Crystal oscillator input pin
OCLK
Crystal oscillator output pin
P
Power pin
Note:
