1.

Preface

1.1

Buffer Types

Table 1-1. LAN8670/1/2 Buffer Type Descriptions

Buffer

Description

AI

Analog input

AO

Analog output

AIO

Analog bi-directional

ICLK

Oscillator input

OCLK

Crystal oscillator output

P

Power

PD

55 kΩ (typical) internal pull-down. Unless otherwise noted in the pin description, internal pull-downs are always

enabled.

Internal pull-down resistors prevent unconnected inputs from floating. Do not rely on internal resistors to drive

signals external to the device. When connected to a load that must be pulled low, an external resistor must be

added.

PU

55 kΩ (typical) internal pull-up. Unless otherwise noted in the pin description, internal pull-ups are always enabled.

Internal pull-up resistors prevent unconnected inputs from floating. Do not rely on internal resistors to drive signals

external to the device. When connected to a load that must be pulled high, an external resistor must be added.

VIS-VDDP

3.3V Schmitt-triggered input (VDDP power domain)

VO-VDDP

3.3V output (VDDP power domain)

VOH-VDDP

3.3V high-speed output (VDDP power domain)

VOD-VDDP

3.3V open-drain output (VDDP power domain)

Note:  Digital signals are not 5V tolerant unless specified.

LAN8670/1/2

Preface

and its subsidiaries

Product Brief

DS60001536E-page 4