Ultra Fast USB 2.0
Datasheet
Voltage | tRT |
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VDD33 | 3.3V | 100% |
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| 90% |
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VSS
10%
t10% | t90% | Time |
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%.
7.2Recommended Operating Conditions
PARAMETER | SYMBOL | MIN | MAX | UNITS | COMMENTS |
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Operating |
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Temperature |
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Commercial Part | TA | 0 | 70 | °C |
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Industrial Part | TA | 85 | °C |
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3.3V supply voltage | VDD33, | 3.0 | 3.6 | V | (Note 7.4) |
| VDDA33 |
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3.3V supply rise time | tRT | 0 | 400 | μs | (See Figure 7.1 and Note 7.3) |
Voltage on |
| 5.5 | V | If any 3.3V supply voltage drops | |
USB+ and USB- pins |
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| below 3.0V, then the MAX |
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| becomes: |
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| (3.3V supply voltage) + 0.5 ≤ 5.5 |
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Voltage on any signal |
| VDD33 | V |
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pin |
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Voltage on XTAL1 |
| VDDA33 | V |
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Voltage on XTAL2 |
| VDD18 | V |
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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.
SMSC USB2250/50i/51/51i | 29 | Revision 1.1 |
DATASHEET