USB2244 Standard Microsystems Corp., USB2244 Datasheet - Page 12

• Manufacturer Part Number: USB2244
• Description: Usb2244/usb2244i Ultra Fast Usb 2.0 Sd/mmc Flash Media Controller
• Manufacturer: Standard Microsystems Corp.

Revision 1.0 (05-27-08)
5.2
I
IS
I/O12
I/O200
I/O12PU
O12
ICLKx
OCLKx
I/O-U
I-R
TEST Input
No Connects
+1.8V Core
power
3.3V Power &
Regulator Input.
Ground
NAME
BUFFER
Buffer Type Descriptions
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)
TEST
NC
VDD18
VDD33
VSS
SYMBOL
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.
Table 5.3 USB2244/USB2244i Buffer Type Descriptions
36-PIN
SLUG
QFN
28
13
14
22
6
DIGITAL / POWER
DATASHEET
I
BUFFER
TYPE
12
DESCRIPTION
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.
All VDD18 pins must be connected together on
the circuit board.
+1.8V core power. This pin must have a 1.0
(or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
3.3V Power & Regulator Input.
Ground Reference
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
DESCRIPTION
SMSC USB2244/USB2244i
Datasheet
μ
F