USB2250 datasheet(16/43 Pages) MICROCHIP

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 2009 - 2015 Microchip Technology Inc.

DS00002005A-page 16

USB2250/50i/51/51i

Note 5-1

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.

Note 5-2

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

5.2

Buffer Type Descriptions

Ground

VSS

102

122

126

Ground Reference

TABLE 5-2:

BUFFER TYPE DESCRIPTIONS

BUFFER

DESCRIPTION

Input.

IPU

Input with internal weak pull-up resistor.

IPD

Input with internal weak pull-down resistor.

Input with Schmitt trigger.

I/O12

Input/Output buffer with 12 mA sink and 12 mA source.

I/O200

Input/Output buffer 12 mA with FET disabled, 100/200 mA source only when the FET

is enabled.

I/O12PD

Input/Output buffer with 12 mA sink and 12 mA source with an internal weak pull-down

resistor.

I/O12PU

Input/Output buffer with 12 mA sink and 12 mA source with a pull-up resistor.

O12

Output buffer with 12 mA source.

O12PU

Output buffer with 12 mA sink and 12 mA source, with a pull-up resistor.

O12PD

Output buffer with 12 mA sink and 12 mA source, with a pull-down resistor.

ICLKx

XTAL clock input.

OCLKx

XTAL clock output.

I/O-U

Analog Input/Output as defined in the USB 2.0 Specification.

I-R

RBIAS.

TABLE 5-1:

USB2250/50I/51/51I 128-PIN VTQFP PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

128-Pin

VTQFP

Buffer

Type

Description

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