SMSC USB2514 Chapter 3 Pin Descriptions, 3.1PIN Descriptions, TYPE, BUFFER, SYMBOL, 36 QFN, 48 QFN, DESCRIPTION, UPSTREAM USB INTERFACES, Table 3.1 USB2514 Pin Descriptions

USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Chapter 3 Pin Descriptions

3.1PIN 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

			BUFFER
SYMBOL	36 QFN	48 QFN	TYPE	DESCRIPTION
		UPSTREAM USB INTERFACES
USBUP_DP	31	43	IO-U	USB Bus Data
USBUP_DM	30	42		These pins connect to the upstream USB bus data
				signals (Host port, or upstream hub).
VBUS_DET	27	35	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 4-PORT USB 2.0 INTERFACE
USBDN_DP[4:1]/	9	9	IO-U	High-Speed USB Data & Port Disable Strap Option
PRT_DIS_P[4:1]	7	7		These pins connect to the downstream USB peripheral
	4	4
&	2	2		devices attached to the hub’s port.
USBDN_DM[4:1]/	8	8		Downstream Port Disable Strap option:
PRT_DIS_M[4:1]	6	6		If this strap is enabled by package and configuration
	3	3
	1	1		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[4:1]	20	27	O12	USB Power Enable
	18	21		Enables power to USB peripheral devices downstream.
	16	19
	12	15		The active signal level of the PRTPWR[4:1] pins is
				determined by the Power Polarity Strapping function of
				the PRTPWR_POL pin.

SMSC USB2514	9	Revision 1.98 (11-19-07)
	DATASHEET