USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
3.3
Buffer Type Descriptions
Table 3.3 Buffer Types
DESCRIPTION
BUFFER TYPE
IS
I_RST
I_SMB
O8
Schmitt-triggered input
Reset Input
I2C/SMBus Clock Input
Output with 8 mA sink and 8 mA source
OD8
O12
Open-drain output with 8 mA sink
Output with 12 mA sink and 12 mA source
HSIC
PU
High-Speed Inter-Chip (HSIC) USB Specification, Version 1.0 compliant input/output
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
ICLK
P
Analog bi-directional
Crystal oscillator input pin
Power pin
Revision 1.0 (06-17-13)
16
SMSC USB3813
DATASHEET
SMSC [ SMSC CORPORATION ]
