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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i 19 Revision 1.1 (05-29-08)
DATASHEET
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.
DIGITAL POWER, and GROUND
1.8V Digital Core
Power
VDD18 49 All VDD18 pins must be connected together
on the circuit board.
+1.8V Core power. If the internal regulator is
enabled, then this pin must have a 1.0
μF (or
greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
3.3V Power &
Voltage
Regulator Input
VDD33 15
50
65
77
104
3.3V Power & Voltage Regulator Input
Ground VSS 9
17
51
75
81
102
122
126
Ground Reference.
Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)
NAME SYMBOL
128-PIN
VTQFP
BUFFER
TYPE DESCRIPTION