USB2228-NU-09 Standard Microsystems (SMSC), USB2228-NU-09 Datasheet - Page 12

• Manufacturer Part Number: USB2228-NU-09
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2228-NU-09

• Lead Free Status / RoHS Status: Compliant

4th Generation USB 2.0 Flash Media Controller with Integrated Card Power FETs
Datasheet
SMSC USB2227/USB2228
SM_nWPS
SM_D[7:0]
SYMBOL
SM_nB/R
SM_nWE
SM_nCD
SM_nRE
SM_nCE
128-PIN
VTQFP
72
71
70
69
68
67
66
65
81
82
76
77
83
78
BUFFER
I/O8PD
O8PU
TYPE
O8PU
08PU
IPU
IPU
08
08
08
I
DATASHEET
SM Data 7-0:
These pins are the bi-directional data signal SM_D7-SM_D0.
The bi-directional data signal has an internal weak pull-down
resistor.
SM Read Enable:
This pin is an active low read strobe signal for SM device.
When using the internal FET, this pin has an internal weak pull-
up resistor that is tied to the output of the internal Power FET.
If an external FET is used (Internal FET is disabled), then the
internal pull-up is not available (external pull-ups must be used,
and should be connected to the applicable Card Power Supply).
SM Write Enable:
This pin is an active low write strobe signal for SM device.
When using the internal FET, this pin has an internal weak pull-
up resistor that is tied to the output of the internal Power FET.
If an external FET is used (Internal FET is disabled), then the
internal pull-up is not available (external pull-ups must be used,
and should be connected to the applicable Card Power Supply).
SM Write Protect Switch:
A write-protect seal is detected, when this pin is low.
This pin has an internally controlled weak pull-up resistor.
SM Busy or Data Ready:
This pin is connected to the BSY/RDY pin of the SM device.
An external pull-up resistor is required on this signal. The pull-
up resistor must be pulled up to the same power source that
powers the SM/NAND flash device.
SM Chip Enable:
This pin is the active low chip enable signal to the SM device.
When using the internal FET, this pin has an internal weak pull-
up resistor that is tied to the output of the internal Power FET.
If an external FET is used (Internal FET is disabled), then the
internal pull-up is not available (external pull-ups must be used,
and should be connected to the applicable Card Power Supply).
SM Card Detection:
This is the card detection signal from SM device to indicate if
the device is inserted.
This pin has an internally controlled weak pull-up resistor.
12
DESCRIPTION
Revision 1.93 (11-01-07)