Table 4.5 buffer type descriptions, Datasheet – SMSC USB2503A User Manual

Page 13

Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

SMSC USB2503/USB2503A

Revision 2.3 (08-27-07)

DATASHEET

VDD3P3

CORE

PLL

VDD33CR

+3.3V I/O and Core power.

VSS

Ground.

Table 4.5 Buffer Type Descriptions

BUFFER

DESCRIPTION

Input.

IPD

Input, with a weak Internal pull-down.

IPU

Input, with a weak Internal pull-up.

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

This manual is related to the following products:

USB2503