USB2601/USB2602

DS00002119A-page 16

 2004 - 2016 Microchip Technology Inc.

Note 1: 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.

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

5.2

Buffer Type Descriptions

3.3V Analog Power

VDDA33

3.3v Analog PHY Power

DIGITAL POWER, GROUNDS, and NO CONNECTS

1.8V Digital Core

Power

VDD18

+1.8V Core power

All VDD18 pins must be connected together on the circuit

board.

3.3v Power & &

Voltage Regulator

Input

VDD33

3.3V Power & Regulator Input.

Pin 87 supplies 3.3V power to the internal 1.8V regulator.

Ground

VSS

Ground Reference

No Connect

NC

No Connect. No trace or signal should be routed/attached

to these pins.

TABLE 5-1:

USB2601/USB2602 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.

I/O12

Input/Output, 12mA

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

Name

Symbol

Buffer Type

Description