USB5744 datasheet(14/49 Pages) MICROCHIP

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USB5744

DS00001855D-page 14

 2015-2016 Microchip Technology Inc.

TABLE 3-7:

MISCELLANEOUS PIN DESCRIPTIONS

Num

Pins

Symbol

Buffer

Type

Description

RESET_N

The RESET_N pin puts the device into Reset Mode, as the name of

the pin and function then align.

XTALI

ICLK

External 25 MHz crystal input

CLK_IN

ICLK

External reference clock input.

The device may alternatively be driven by a single-ended clock oscil-

lator. When this method is used, XTALO should be left unconnected.

XTALO

OCLK

External 25 MHz crystal output

RBIAS

A 12.0 k

 (+/- 1%) resistor is attached from ground to this pin to set

the transceiver’s internal bias settings.

ATEST

Analog test pin.

This signal is used for test purposes and must always be connected to

ground.

TABLE 3-8:

POWER AND GROUND PIN DESCRIPTIONS

Num

Pins

Symbol

Buffer

Type

Description

VDD33

+3.3 V power and internal regulator input

Refer to Section 4.1, "Power Connections" for power connection infor-

mation.

VDD12

+1.2 V core power

Refer to Section 4.1, "Power Connections" for power connection infor-

mation.

Pad

VSS

Common ground.

This exposed pad must be connected to the ground plane with a via

array.

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