Ultra Fast USB 2.0 Multi-Format Flash Media Controller

Datasheet

SMSC USB2250/51/59

21

Revision 2.6 (05-08-08)

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.

RESET Input

nRESET

64

IS

This active low signal is used by the system to

reset the chip. The active low pulse should be at

least 1

μs wide.

TEST Input

TEST

103

I

This signal is used for testing the chip. User

should normally tie this pin low externally, if the

test function is not used.

Regulator

Enable

REG_EN

6

IPU

This signal is used to enable the internal 1.8V

regulator.

ANALOG / 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

greater) ±20% (ESR <0.1

Ω) capacitor to VSS.

3.3V Power &

Voltage

Regulator

Input

VDD33

15

50

65

77

104

3.3V Power & Voltage Regulator Input

1.8V PLL

Power

VDD18PLL

125

This pin is the 1.8V Power for the PLL.

If the internal regulator is enabled, then this pin

must have a 1.0

<0.1

Ω) capacitor to VSS.

3.3V Analog

Power

VDDA33

128

3.3V Analog Power

Ground

VSS

9

17

51

75

81

102

122

126

Ground Reference

Table 5.1 USB2250/51/59 128-Pin VTQFP Pin Descriptions (continued)

NAME

SYMBOL

128-PIN

VTQFP

BUFFER

TYPE

DESCRIPTION