Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Datasheet

Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)

 

 

128-PIN

BUFFER

 

NAME

SYMBOL

VTQFP

TYPE

DESCRIPTION

 

 

 

 

 

 

 

DIGITAL POWER, and GROUND

 

 

 

 

 

1.8V Digital Core

VDD18

49

 

All VDD18 pins must be connected together

Power

 

 

 

on the circuit board.

 

 

 

 

+1.8V Core power. If the internal regulator is

 

 

 

 

enabled, then this pin must have a 1.0μF (or

 

 

 

 

greater) ±20% (ESR <0.1Ω) capacitor to

 

 

 

 

VSS.

 

 

 

 

 

3.3V Power &

VDD33

15

 

3.3V Power & Voltage Regulator Input

Voltage

 

50

 

 

Regulator Input

 

65

 

 

 

 

77

 

 

 

 

104

 

 

 

 

 

 

 

Ground

VSS

9

 

Ground Reference.

 

 

17

 

 

 

 

51

 

 

 

 

75

 

 

 

 

81

 

 

 

 

102

 

 

 

 

122

 

 

 

 

126

 

 

 

 

 

 

 

Notes:

 

 

 

 

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

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

3.Refer to PWR_MGMT_CTL1 register for controlling pull-up / down resistors associated with the pins as well as the individual card control registers.

SMSC USB2250/50i/51/51i

19

Revision 1.1 (05-29-08)

DATASHEET