4th Generation USB2.0 Flash Media Controller with Integrated Card Power FETs

Datasheet

Revision 1.91 (10-13-06)

20

SMSC USB2227/USB2228

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.

VDD18 (Pin 106) and VDD18PLL (Pin 101) must have a 10uF +/-20% Low-ESR (equivalent series

resistance) <0.1 ohm bypass capacitor to VSSA. These capacitors must be as close to these pins

as possible.

5.2

Buffer Type Descriptions

VSS

15

16

47

84

85

97

112

A8

B40

Ground:

Ground Reference

Table 5.1 USB2227/USB2228 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.

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

SYMBOL

128-PIN

VTQFP

124-PIN

DQFN

BUFFER

TYPE

DESCRIPTION