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Integrated USB 2.0 Compatible 3-Port Hub
Datasheet
SMSC USB2503/USB2503A 13 Revision 2.3 (08-27-07)
DATASHEET
VDD3P3
CORE
PLL
VDD33CR +3.3V I/O and Core power.
VSS VSS Ground.
Table 4.5 Buffer Type Descriptions
BUFFER DESCRIPTION
I Input.
IPD Input, with a weak Internal pull-down.
IPU Input, with a weak Internal pull-up.
IS Input with Schmitt trigger.
O12 Output 12mA.
I/O12 Input/Output, 12mA
IOSD12 Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKx XTAL Clock Input
OCLKx XTAL Clock Output
I-R *RBIAS.
IO-U Defined in USB Specification.
Note: Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets USB
2.0 requirements when operating as a 2.0-compliant device.
AIO Analog Input/output. Per PHY test requirements.
Table 4.4 Power, Ground, and No Connect (continued)
NAME SYMBOL TYPE FUNCTION