SMSC USB2601 - Manual (Page 20)

4th Generation USB 2.0 Flash Media Controller with Integrated Card Power FETs & HS Hub
Datasheet
Revision 1.6 (06-20-08) 20 SMSC USB2601/USB2602
DATASHEET
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.
6.2 Buffer Type Descriptions
3.3V Analog Power VDDA33 3.3v Analog PHY Power
DIGITAL POWER, GROUNDS, and NO CONNECTS
1.8V Digital Core
Power
VDD18 +1.8V Core power
All VDD18 pins must be connected together on the
circuit board.
3.3v Power & &
Voltage Regulator
Input
VDD33 3.3V Power & Regulator Input.
Pin 87 supplies 3.3V power to the internal 1.8V
regulator.
Ground VSS Ground Reference
No Connect NC No Connect. No trace or signal should be
routed/attached to these pins.
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
NAME SYMBOL
BUFFER
TYPE DESCRIPTION