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| Ultra Fast USB 2.0 SD/MMC Flash Media Controller |
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| Datasheet |
| Table 5.2 USB2244/2244i | ||||
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| BUFFER |
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NAME |
| SYMBOL | QFN | TYPE | DESCRIPTION |
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TEST Input |
| TEST | 28 | I | This signal is used for testing the chip. User |
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| should normally tie this pin low externally if the |
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| test function is not used. |
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No Connects |
| NC |
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| No Connect. No trace or signal should be |
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| routed/attached to these pins. |
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| DIGITAL / POWER | ||
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+1.8V Core |
| VDD18 | 13 |
| All VDD18 pins must be connected together on |
power |
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| the circuit board. |
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| +1.8V core power. This pin must have a 1.0μF |
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| (or greater) ±20% (ESR <0.1Ω) capacitor to |
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| VSS. |
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3.3V Power & |
| VDD33 | 6 |
| 3.3V Power & Regulator Input. |
Regulator Input. |
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| 14 |
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| 22 |
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Ground |
| VSS | SLUG |
| Ground Reference |
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5.2Buffer Type Descriptions
| Table 5.3 USB2244/USB2244i Buffer Type Descriptions |
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BUFFER | DESCRIPTION |
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I | Input. |
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IS | Input with Schmitt trigger. |
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I/O12 | Input/Output buffer with 12mA sink and 12mA source. |
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I/O200 | Input/Output buffer 12mA with FET disabled, 100/200mA source only when the FET is |
| enabled. |
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I/O12PU | Input/Output buffer with 12mA sink and 12mA source with a |
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O12 | Output buffer with 12mA source. |
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ICLKx | XTAL clock input. |
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OCLKx | XTAL clock output. |
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Analog Input/Output Defined in USB specification. | |
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RBIAS. | |
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Revision 1.0 | 12 | SMSC USB2244/USB2244i |
DATASHEET