USB3318C-CP-TR datasheet(11/73 Pages) MICROCHIP

Part #	USB3318C-CP-TR

Description	Hi-Speed USB Transceiver with 1.8V-3.3V ULPI Interface - 13MHz Reference Clock

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Manufacturer	MICROCHIP [Microchip Technology]

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Hi-Speed USB Transceiver with 1.8V-3.3V ULPI Interface - 13MHz Reference Clock

Datasheet

SMSC USB3318 REV C

11

Revision 2.1 (06-02-10)

DATASHEET

19

DIR

Output,

CMOS

N/A

Controls the direction of the data bus.

When the PHY has data to transfer to the

Link, it drives DIR high to take ownership

of the bus. When the PHY has no data to

transfer it drives DIR low and monitors

the bus for commands from the Link.

20

STP

Input,

CMOS

High

The Link asserts STP for one clock cycle

to stop the data stream currently on the

bus. If the Link is sending data to the

PHY, STP indicates the last byte of data

was on the bus in the previous cycle.

21

VDD1.8

Power

N/A

External 1.8V Supply input pin. This pad

needs to be bypassed with a 0.1uF

capacitor to ground, placed as close as

possible to the USB3318.

22

RESETB

Input,

CMOS,

N/A

When low, the part is suspended with all

of the I/O tri-stated. When high the

USB3318 will operate as a normal ULPI

device.

23

REFCLK

Input,

CMOS

N/A

13MHz Reference Clock input.

24

RBIAS

Analog,

CMOS

N/A

Rbias pin. This pin requires an 8.06kΩ

(±1%) resistor to ground, placed as close

as possible to the USB3318.

FLAG

GND

Ground

N/A

Ground.

QFN only: The flag should be connected

to the ground plane with a via array

under the exposed flag. This is the main

ground for the IC.

Table 2.1 USB3318 Pin Description (continued)

NAME

DIRECTION/

TYPE

ACTIVE

LEVEL

DESCRIPTION

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USB3318C-CP-TR Datasheet(PDF) 11 Page - Microchip Technology

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