USB2534 datasheet(21/62 Pages) SMSC

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USB 2.0 Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB2534

Revision 1.0 (06-17-13)

DATASHEET

3.3

Buffer Type Descriptions

Table 3.3 Buffer Types

BUFFER TYPE

DESCRIPTION

Schmitt-triggered input

I_RST

Reset Input

I_SMB

I2C/SMBus Clock Input

Output with 8 mA sink and 8 mA source

OD8

Open-drain output with 8 mA sink

OD12

Open-drain output with 12 mA sink

50 µA (typical) internal pull-up. Unless otherwise noted in the pin description, internal pull-

ups are always enabled.

Note:

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.

50 µA (typical) internal pull-down. Unless otherwise noted in the pin description, internal

pull-downs are always enabled.

Note:

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.

AIO

Analog bi-directional

ICLK

Crystal oscillator input pin

OCLK

Crystal oscillator output pin

Power pin

USB2534 数据表(PDF) 21 Page - SMSC Corporation

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