USB2244 Datasheet, PDF (12/22 Pages) SMSC Corporation – Ultra Fast USB 2.0 SD/MMC Flash Media Controller

Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)
NAME
TEST Input
SYMBOL
TEST
No Connects
NC
+1.8V Core
power
VDD18
3.3V Power &
VDD33
Regulator Input.
Ground
VSS
36-PIN
QFN
BUFFER
TYPE
DESCRIPTION
28
I
This signal is used for testing the chip. User
should normally tie this pin low externally if the
test function is not used.
No Connect. No trace or signal should be
routed/attached to these pins.
DIGITAL / POWER
13
6
14
22
SLUG
All VDD18 pins must be connected together on
the circuit board.
+1.8V core power. This pin must have a 1.0μF
(or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
3.3V Power & Regulator Input.
Ground Reference
5.2
Buffer Type Descriptions
BUFFER
I
IS
I/O12
I/O200
I/O12PU
O12
ICLKx
OCLKx
I/O-U
I-R
Table 5.3 USB2244/USB2244i Buffer Type Descriptions
DESCRIPTION
Input.
Input with Schmitt trigger.
Input/Output buffer with 12mA sink and 12mA source.
Input/Output buffer 12mA with FET disabled, 100/200mA source only when the FET is
enabled.
Input/Output buffer with 12mA sink and 12mA source with a pull-up resistor.
Output buffer with 12mA source.
XTAL clock input.
XTAL clock output.
Analog Input/Output Defined in USB specification.
RBIAS.
Revision 1.0 (05-27-08)
12
DATASHEET
SMSC USB2244/USB2244i