Smsc USB2244 Manual do Utilizador descarregar pdf (Página 15)

Ultra Fast USB 2.0 SD/MMC Flash Media Controller

Datasheet

SMSC USB2244/USB2244i 15 Revision 1.0 (05-27-08)

DATASHEET

Chapter 7 DC Parameters

7.1 Maximum Guaranteed Ratings

Note 7.1 Stresses above the specified parameters may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at any condition above

those indicated in the operation sections of this specification is not implied.

Note 7.2 When powering this device from laboratory or system power supplies, it is important that

the Absolute Maximum Ratings 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, it is suggested that a clamp circuit be used.

PARAMETER SYMBOL MIN MAX UNITS COMMENTS

Storage

Temperature

-55 150 °C

Lead

Temperature

325 °C Soldering < 10 seconds

3.3V supply

voltage

DD33,

DDA33

-0.5 4.0 V

Voltage on

USB+ and

USB- pins

-0.5 (3.3V supply voltage + 2) ≤ 6V

Voltage on

GPIO10

-0.5 V

DD33

+ 0.3 V When internal power FET

operation of this pin is enabled,

this pin may be simultaneously

shorted to ground or any

voltage up to 3.63V indefinitely,

without damage to the device

as long as V

DD33

and V

DDA33

are less than 3.63V and T

less than 70

Voltage on any

signal pin

-0.5 V

DD33

+ 0.3 V

Voltage on

XTAL1

-0.5 4.0 V

Voltage on

XTAL2

-0.5 V

DD18

+ 0.3 V

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21 22

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