Datasheet

USB251xB/xBi

DS00001692C-page 16  2010 - 2015 Microchip Technology Inc.

3.4 Buffer Type Descriptions

TABLE 3-4: BUFFER TYPE DESCRIPTIONS

Buffer Type Description

I Input

I/O Input/output

IPD Input with internal weak pull-down resistor

IPU Input with internal weak pull-up resistor

IS Input with Schmitt trigger

O12 Output 12 mA

I/O12 Input/output buffer with 12 mA sink and 12 mA source

I/OSD12 Open drain with Schmitt trigger and 12 mA sink. Meets the I

C-Bus

Specification [2] requirements.

ICLKx XTAL clock input

OCLKx XTAL clock output

I-R RBIAS

I/O-U Analog input/output defined in USB specification