SMSC USB4640i ユーザーズマニュアル

High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

SMSC USB4640/USB4640i

57

Revision 1.0 (06-01-09)

Commercial

USB4640

Operating 

Temperature

T

A

0

70

°C

Ambient temperature in still air.

Industrial

USB4640i

Operating 

Temperature

T

A

-40

85

°C

Ambient temperature in still air.

3.3 V supply voltage

VDD33

3.0

3.6

V

A 3.3 V regulator with an output 

tolerance of 1% must be used if 

the output of the internal power 

FET’s must support a 5% 

tolerance.

3.3 V supply rise time

t

RT

0

400

μs

)

Voltage on 

USB+ and USB- pins

-0.3

5.5

V

If any 3.3 V supply voltage drops 

below 3.0 V, then the MAX 

becomes:

(3.3 V supply voltage) + 0.5 

≤ 5.5

Voltage on any signal 

pin

-0.3

VDD33

V

Voltage on XTAL1 

-0.3

2.0

V

Voltage on XTAL2

-0.3

2.0

V

Low Input Level

High Input Level 

Pull Down

Pull Up

V

ILI

V

IHI

PD

PU

2.0

72

58

0.8

V

V

μA

μA

TTL Levels

Low Input Level

High Input Level  

Hysteresis

V

ILI

V

IHI

V

HYSI

2.0

420

0.8

V

V

mV

TTL Levels