SMSC USB2512B User Manual

USB 2.0 Hi-Speed Hub Controller

Revision 1.0 (3-11-09)

60

SMSC USB251x

Stresses above the specified parameters could 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. 

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.

Storage 

Temperature

T

STOR

-55

150

°C

Lead 

Temperature

Refer to JEDEC Specification J-STD-

020D.

3.3 V supply 

voltage

VDD33

PLLFILT

CRFILT

4.6

V

Applies to all parts.

Voltage on any 

I/O pin

-0.5

5.5

V

Voltage on 

XTALIN

-0.5

4.0

V

Voltage on 

XTALOUT

-0.5

2.5

V

Commercial

Operating 

Temperature

T

A

0

70

°C

Ambient temperature in still air.

Only applies to USB251x, USB251xA, 

and USB251xB products.

Industrial

Operating 

Temperature

T

AI

-40

85

°C

Ambient temperature in still air.

Only applies to USB251xi, 

USB251xAi, and USB251xBi 

products.

3.3 V supply voltage

VDD33

3.0

3.6

V

Applies to all parts.

3.3 V supply rise 

time

t

RT

0

400

μs

See 

Voltage on any I/O 

pin

-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 

Voltage on XTALIN

-0.3

VDD33

V