SMSC USB4640i ユーザーズマニュアル

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

Revision 1.0 (06-01-09)

56

SMSC USB4640/USB4640i

Note: Stresses above the specified parameters may cause permanent damage to the device. This is

a stress rating only. Functional operation of the device at any condition above those indicated
in the operation sections of this specification is not implied. When powering this device from
laboratory or system power supplies the absolute maximum ratings must not be exceeded or
device failure can result. Some power supplies exhibit voltage spikes on their outputs when the
AC power is switched on or off. In addition, voltage transients on the AC power line may appear
on the DC output. When this possibility exists, a clamp circuit should be used.

Storage 

Temperature

T

STOR

-55

150

°C

Lead 

Temperature

°C

Please refer to JEDEC 

specification J-STD-020D.

3.3 V supply 

voltage

VDD33

-0.5

4.0

V

Voltage on 

USB+ and 

USB- pins

-0.5

(3.3 V supply voltage + 2) 

≤ 6

V

Voltage on  

GPIO10

-0.5

VDD33 + 0.3

V

When internal power FET 

operation of these pins are 

enabled, these pins may be 

simultaneously shorted to 

ground or any voltage up to 

3.63 V indefinitely, without 

damage to the device as 

long as VDD33 is less than 

3.63 V and T

A

 is less than 

70

o

C.

Voltage on 

any signal pin

-0.5

VDD33 + 0.3

V

Voltage on 

XTAL1 

-0.5

3.6

V

Voltage on 

XTAL2

-0.5

2.0

V

t

10%

10%

90%

Voltage

t

RT

t

90%

Time

100%

3.3 V

VSS

VDD33