 2015-2016 Microchip Technology Inc.

DS00001855D-page 11

USB5744

3.2

Pin Descriptions

This section contains descriptions of the various USB5744 pins. This pin descriptions have been broken into functional

groups as follows:

• USB 3.1 Gen 1 Pin Descriptions

• USB 2.0 Pin Descriptions

• USB Port Control Pin Descriptions

• SPI/SMBus Pin Descriptions

• Miscellaneous Pin Descriptions

• Power and Ground Pin Descriptions

The “_N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage

level. For example, RESET_N indicates that the reset signal is active low. When “_N” is not present after the signal

name, the signal is asserted when at the high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a mixture of

“active low” and “Active high” signals. The term assert, or assertion, indicates that a signal is active, independent of

whether that level is represented by a high or low voltage. The term negate, or negation, indicates that a signal is inac-

tive.

Note:

The buffer type for each signal is indicated in the “Buffer Type” column of the pin description tables. A

description of the buffer types is provided in Section 3.3, "Buffer Types," on page 15.

For additional information on configuration straps and configurable pins, refer to Section 3.4, "Configuration

Straps and Programmable Functions".

TABLE 3-3:

USB 3.1 GEN 1 PIN DESCRIPTIONS

Num

Pins

Symbol

Buffer

Type

Description

1

USB3UP_TXDP

IO-U

USB 3.1 Gen 1 upstream SuperSpeed transmit data plus.

1

USB3UP_TXDM

IO-U

USB 3.1 Gen 1 upstream SuperSpeed transmit data minus.

1

USB3UP_RXDP

IO-U

USB 3.1 Gen 1 upstream SuperSpeed receive data plus.

1

USB3UP_RXDM

IO-U

USB 3.1 Gen 1 upstream SuperSpeed receive data minus.

4

USBDN_TXDP[4:1]

IO-U

USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed transmit data plus.

4

USBDN_TXDM[4:1]

IO-U

USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed transmit data

minus.

4

USBDN_RXDP[4:1]

IO-U

USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed receive data plus.

4

USBDN_RXDM[4:1]

IO-U

USB 3.1 Gen 1 downstream ports 4-1 SuperSpeed receive data

minus.

TABLE 3-4:

USB 2.0 PIN DESCRIPTIONS

Num

Pins

Symbol

Buffer

Type

Description

1

USB2UP_DP

IO-U

USB 2.0 upstream data plus (D+).

1

USB2UP_DM

IO-U

USB 2.0 upstream data minus (D-).