USB3250 datasheet(9/46 Pages) MICROCHIP

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 2013 - 2016 Microchip Technology Inc.

DS00002142A-page 9

USB3250

Note 4-1

A Ferrite Bead (with DC resistance <.5 Ohms) is recommended for filtering between both the VDD3.3

and VDDA3.3 supplies and the VDD1.8 and VDDA1.8 Supplies. See FIGURE 8-9: Application

Diagram for 56-pin VQFN Package on page 39.

Note 4-2

All VSS and VSSA are bonded to the exposed pad under the IC in the package. The exposed pad

must be connected to solid GND plane on printed circuit board.

TABLE 4-3:

USB I/O SIGNALS

Name

Direction

Active Level

Description

I/O

N/A

USB Positive Data Pin.

I/O

N/A

USB Negative Data Pin.

TABLE 4-4:

BIASING AND CLOCK OSCILLATOR SIGNALS

Name

Direction

Active Level

Description

RBIAS

Input

N/A

External 1% bias resistor. Requires a 12K

 resistor to ground.

Used for setting HS transmit current level and on-chip termination

impedance.

XI/XO

Input

N/A

External crystal. 12MHz crystal connected from XI to XO.

TABLE 4-5:

POWER AND GROUND SIGNALS

Name

Direction

Active Level

Description

VDD3.3

N/A

3.3V Digital Supply. Powers digital pads. See Note 4-1

VDD1.8

N/A

1.8V Digital Supply. Powers digital core.

VSS

N/A

Digital Ground. See Note 4-2

VDDA3.3

N/A

3.3V Analog Supply. Powers analog I/O and 3.3V analog circuitry.

VDDA1.8

N/A

1.8V Analog Supply. Powers 1.8V analog circuitry. See Note 4-1

VSSA

N/A

Analog Ground. See Note 4-2

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