USB2512 datasheet(27/72 Pages) SMSC

27 / 72 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251x

Revision 1.0 (3-11-09)

DATASHEET

5.3

Buffer Type Descriptions

SEL48

48 MHz Clock Input Selection

48 MHz external input clock select. When the hub is clocked from an external

clock source, this pin selects either 24 MHz or 48 MHz mode.

‘0’ = 24 MHz

‘1’ = 48 MHz

POWER, GROUND, and NO CONNECTS

CRFILT

VDD Core Regulator Filter Capacitor

This pin must have a 1.0

μF (or greater) ±20% (ESR <0.1

Ω) capacitor to

VSS.

VDD33

3.3 V Power

PLLFILT

PLL Regulator Filter Capacitor

This pin must have a 1.0

μF (or greater) ±20% (ESR <0.1

Ω) capacitor to

VSS.

VSS

Ground Pad / ePad

The package slug is the only VSS for the device and must be tied to ground

with multiple vias.

No Connect

No signal or trace should be routed or attached to these pins.

Table 5.3 Buffer Type Descriptions

BUFFER

DESCRIPTION

Input.

I/O

Input/Output.

IPD

Input with internal weak pull-down resistor.

IPU

Input with internal weak pull-up resistor.

Input with Schmitt trigger.

O12

Output 12 mA.

Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

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