USB3450 datasheet(14/40 Pages) SMSC

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Hi-Speed USB Host or Device PHY With UTMI+ Interface

Datasheet

Revision 0.1 (05-11-05)

SMSC USB3450

DATASHEET

Input,

Analog

N/A

Crystal pin. A 24MHz crystal is supported. The

crystal is placed across XI and XO. An external

24MHz clock source may be driven into XI in place

of a crystal.

VDDA1.8

N/A

1.8V regulator output for analog circuitry on chip.

Place a 0.1uF capacitor near this pin and connect

the capacitor from this pin to ground. In parallel,

place a 4.7uF low ESR capacitor near this pin and

connect the capacitor from this pin to ground. See

Section 6.6.1, "Internal Regulators".

VDD3.3

N/A

3.3V PHY Supply. Provides power for Hi-Speed

Transceiver, UTMI+ Digital, Digital I/O, and

Regulators.

VDD3.3

N/A

3.3V PHY Supply. Should be connected directly to

pin 39.

RBIAS

Analog,

CMOS

N/A

External 1% bias resistor. Requires a 12KΩ resistor

to ground.

GND FLAG

Ground

N/A

Ground. The flag must be connected to the ground

plane.

Table 3.1 USB3450 Pin Definitions (continued)

NAME

DIRECTION,

TYPE

ACTIVE

LEVEL

DESCRIPTION

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