USB MultiSwitchTM Hub

 

 

 

Datasheet

 

Table 4.4 Power, Ground, and No Connect (continued)

 

 

 

 

NAME

SYMBOL

TYPE

FUNCTION

 

 

 

 

VDD PLL

VDDPLL18

 

+1.8V Filtered analog power for internal PLL.

 

 

 

This pin must have a 4.7μF (or greater) ±20% (ESR

 

 

 

<0.1Ω) capacitor to VSS

 

 

 

 

VDD Analog

VDDA33

 

+3.3V Filtered analog PHY power, shared between

I/O

 

 

adjacent ports.

 

 

 

 

VSS

VSS

 

Ground

 

 

 

 

NC

NC

 

No Connect

 

 

 

 

 

Table 4.5 Buffer Type Descriptions

 

 

BUFFER

DESCRIPTION

 

 

I

Input.

 

 

IPD

Input, Weak Internal pull-down.

 

 

IPU

Input, Weak Internal pull-up.

 

 

IS

Input with Schmitt trigger.

 

 

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.

 

 

Revision 1.91 (08-22-07)

16

SMSC USB2524

 

DATASHEET