USB3450 datasheet(9/39 Pages) MICROCHIP

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DS00002105A-page 9

USB3450

RXVALID

Output

High

Receive Data Valid. Indicates that the DATA bus has

received valid data. The Receive Data Holding

expected to register the DATA bus on the rising edge

of CLKOUT.

HOST

Input

N/A

Host Pull-down Select. This signal enables the 15k

Ohm pull-down resistor on the DM line.

0: Pull-down resistor not connected to DM

1: Pull-down resistor connected to DM

RXERROR

Output

High

Receive Error. This output is clocked with the same

timing as the receive DATA lines and can occur at

anytime during a transfer.

0: Indicates no error.

1: Indicates a receive error has been detected.

VDD3.3

N/A

3.3V PHY Supply. Provides power for Hi-Speed

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

Regulators.

VDD1.8

N/A

1.8V regulator output for digital circuitry on chip. Place

a 4.7uF low ESR capacitor near this pin and connect

the capacitor from this pin to ground. Connect pin 34

to pin 19. See Section 5.6.1, "Internal Regulators".

Output,

Analog

N/A

Crystal pin. If using an external clock on XI this pin

should be floated.

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 5.6.1,

"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 2-1:

USB3450 PIN DEFINITIONS (CONTINUED)

Name

Direction,

Type

Active

Level

Description

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