SMSC USB2601, USB2602 6.2Buffer Type Descriptions

4th Generation USB 2.0 Flash Media Controller with Integrated Card Power FETs & HS Hub

Datasheet

		BUFFER
NAME	SYMBOL	TYPE	DESCRIPTION
3.3V Analog Power	VDDA33		3.3v Analog PHY Power
	DIGITAL POWER, GROUNDS, and NO CONNECTS
1.8V Digital Core	VDD18		+1.8V Core power
Power			All VDD18 pins must be connected together on the
			circuit board.
3.3v Power & &	VDD33		3.3V Power & Regulator Input.
Voltage Regulator			Pin 87 supplies 3.3V power to the internal 1.8V
Input
			regulator.
Ground	VSS		Ground Reference
No Connect	NC		No Connect. No trace or signal should be
			routed/attached to these pins.

Notes:

„Hot-insertion capable card connectors are required for all flash media. It is required for SD connector to have Write Protect switch. This allows the chip to detect MMC card.

„nMCE is normally asserted except when the 8051 is in standby mode.

6.2Buffer Type Descriptions

	Table 6.1 USB2601/USB2602 Buffer Type Descriptions
BUFFER	DESCRIPTION
I	Input
IPU	Input with internal weak pull-up resistor.
IPD	Input with internal weak pull-down resistor.
IS	Input with Schmitt trigger
I/O8	Input/Output buffer with 8mA sink and 8mA source.
I/O8PU	Input/Output buffer with 8mA sink and 8mA source, with an internal weak pull-up resistor.
I/O8PD	Input/Output buffer with 8mA sink and 8mA source, with an internal weak pull-down
	resistor.
I/O12	Input/Output, 12mA
O8	Output buffer with 8mA sink and 8mA source.
O8PU	Output buffer with 8mA sink and 8mA source, with an internal weak pull-up resistor.
O8PD	Output buffer with 8mA sink and 8mA source, with an internal weak pull-down resistor.
ICLKx	XTAL clock input
OCLKx	XTAL clock output
I/O-U	Analog Input/Output Defined in USB specification
AIO	Analog Input/Output

Revision 1.6 (06-20-08)	20	SMSC USB2601/USB2602
	DATASHEET