SMSC USB464, USB4640i QFN, TYPE, 48-PIN, BUFFER, SYMBOL, DATASHEET, DESCRIPTION, DIGITAL / POWER / GROUND, Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

			High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
			Datasheet
	Table 6.1 USB4640/USB4640i Pin Descriptions (continued)
	48-PIN	BUFFER
	QFN	TYPE
SYMBOL		(Table 6.2)	DESCRIPTION
GPIO2 /	36	I/O6	This pin may be used either as input, edge sensitive interrupt input,
			or output. Custom firmware is required to activate this function.
RXD			This signal can be configured as input to the RXD of the internal
			UART. Custom firmware is required to activate this function.
GPIO10	35	I/O200	Card power drive: 3.3 V (100 mA or 200 mA)
(CRD_PWR)			This must be the only FET used to power devices. Failure to do this
			will violate voltage specifications on device pins. If this pin is not
			being used as a card power pin, this pin may be used either as input,
			edge sensitive interrupt input, or output (GPIO).
			Please see Section 8.4.2.3, "A4h-A5h: Smart Media Device Power
			Configuration," on page 38 for more information.
nRESET	38	IS	RESET input
			The system uses this active low signal to reset the chip. The active
			low pulse should be at least 1 μs wide.
TEST	40	I	TEST Input
			Tie this pin to ground for normal operation.
		DIGITAL / POWER / GROUND
CRFILT	15		VDD Core Regulator Filter Capacitor
			This pin requires a 1.0 μF (or greater) ± 20% (ESR <0.1Ω) capacitor
			to VSS.
PLLFILT	46		Phase-locked Loop Regulator Filter Capacitor
			This pin requires a 1.0 μF (or greater) ± 20% (ESR <0.1Ω) capacitor
			to VSS.
VDD12	41		1.2 V Power for HSIC pads and buffers
VDD33	5		3.3 V Power and Regulator Input
	12
	16		Please see Chapter 10, "DC Parameters," on page 56 for more
	25		information.
	34		Pins 16 and 48 each require an external bypass capacitor of 4.7 μF
	48
			minimum.
VSS	ePad		The ground pad is the only VSS for the device and must be tied to
			ground with multiple vias.

Revision 1.0 (06-01-09) 20 SMSC USB4640/USB4640i

DATASHEET