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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i 29 Revision 1.1 (05-29-08)
DATASHEET
Figure 7.1 Supply Rise Time Model
Note 7.3 When powering the device, the maximum power supply ramp time should be set at a rate
faster than 400μs. This speed is important to ensure that the device resets properly.
Measure rise time at 10% and 90%.
7.2 Recommended Operating Conditions
Note 7.4 A 3.3V regulator with an output tolerance of 1% must be used if the output of the internal
power FET’s must support a 5% tolerance.
PARAMETER SYMBOL MIN MAX UNITS COMMENTS
Operating
Temperature
Commercial Part
Industrial Part
T
A
T
A
0
-40
70
85
°C
°C
3.3V supply voltage V
DD33,
V
DDA33
3.0 3.6 V (Note 7.4)
3.3V supply rise time t
RT
0 400 μs (See Figure 7.1 and Note 7.3)
Voltage on
USB+ and USB- pins
-0.3 5.5 V If any 3.3V supply voltage drops
below 3.0V, then the MAX
becomes:
(3.3V supply voltage) + 0.5 ≤ 5.5
Voltage on any signal
pin
-0.3 V
DD33
V
Voltage on XTAL1 -0.3 V
DDA33
V
Voltage on XTAL2 -0.3 V
DD18
V
t
10%
10%
90%
Voltage
t
RT
t
90%
Time
100%
3.3V
VSS
VDD33