USB2513 datasheet(9/48 Pages) SMSC

9 / 48 page

USB 2.0 High-Speed 3-Port Hub Controller

Datasheet

SMSC USB2513

Revision 1.98 (11-19-07)

DATASHEET

Chapter 3 Pin Descriptions

3.1

PIN Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional

groups according to their associated interface.

The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal

is at a low voltage level. When “N” is not present before 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 inactive.

Table 3.1 USB2514 Pin Descriptions

SYMBOL

36 QFN

48 QFN

BUFFER

TYPE

DESCRIPTION

UPSTREAM USB INTERFACES

USBUP_DP

USBUP_DM

IO-U

USB Bus Data

These pins connect to the upstream USB bus data

signals (Host port, or upstream hub).

VBUS_DET

I/O12

Detect Upstream VBUS Power

Detects state of Upstream VBUS power. The SMSC Hub

monitors VBUS_DET to determine when to assert the

internal D+ pull-up resistor (signaling a connect event).

When designing a detachable hub, this pin must be

connected to the VBUS power pin of the USB port that

is upstream of the hub.

For self-powered applications with a permanently

attached host, this pin must be connected to 3.3V

(typically VDD33).

DOWNSTREAM 3-PORT USB 2.0 INTERFACE

USBDN_DP[3:1]/

PRT_DIS_P[3:1]

USBDN_DM[3:1]/

PRT_DIS_M[3:1]

IO-U

High-Speed USB Data & Port Disable Strap Option

These pins connect to the downstream USB peripheral

devices attached to the hub’s port.

Downstream Port Disable Strap option:

If this strap is enabled by package and configuration

settings (see Table 3.2), this pin will be sampled at

RESET_N negation to determine if the port is disabled.

Both USB data pins for the corresponding port must be

tied to the VDDA33 to disable the associated

downstream port.

PRTPWR[3:1]

O12

USB Power Enable

Enables power to USB peripheral devices downstream.

The active signal level of the PRTPWR[3:1] pins is

determined by the Power Polarity Strapping function of

the PRTPWR_POL pin.

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