USB2244/USB2244I
Ultra Fast USB 2.0 SD/MMC
Flash Media Controller
Datasheet
PRODUCT FEATURES
General Description
Mask Programmable Features
The SMSC USB2244/USB2244i is a USB 2.0 compliant,
„
„
„
„
VID/PID/Language ID
high speed Bulk Only Mass Storage Class Peripheral
Controller intended for reading and writing to SD/MMC Flash
Media Cards.
28-character Manufacturer ID and Product string
12-hex digit (max) Serial Number string
Customizable Vendor specific data LED blink interval or
duration
The SMSC USB2244/USB2244i is a fully integrated, single
chip solution capable of ultra high performance operation.
Average sustained transfer rates exceeding 35MB/s are
possible if the media and host can support those rates.
Provisions to read/write secure media formats is also
provided.
Software Features
„
„
„
Optimized for low latency interrupt handling
Reduced memory footprint
Please see the USB2244/USB2244i Software Release
Notes for additional Software Features.
Applications
„
„
„
„
„
„
Flash Media Card Reader/Writer
Printers
„
Desktop and Mobile PCs
Consumer A/V
Media Players/Viewers
TM
Vista ReadyBoost
„
Compatible with Microsoft Vista, Windows XP, Windows
ME, Windows 2K SP4, Apple OSx, and Linux Mass
Storage Class Drivers
—
SD Secure
Hardware Features
„
Single Chip Flash Media Reader/Writer
—
Secure Digital 2.0
–
HS-SD, HC-SD, TransFlash™ and reduced form factor
media
—
MultiMediaCard Specification 4.2
–
1/4/8 bit MMC
„
„
SDIO and MMC Streaming Mode support
Extended configuration options
—
Socket switch polarities, etc.
„
„
Media Activity LED
GPIO configuration and polarity
—
Up to 8 GPIOs for special function use: LED indicators,
power control to memory devices, etc. The number of
actual GPIO’s depends on the implementation
configuration used.
—
One GPIO with up to 200 mA drive
„
„
On Board 24MHz Crystal Driver Circuit
Internal Card Power FET
—
—
200mA
"Fold-back" short circuit current protected
„
8051 8-bit microprocessor
—
—
60MHz - single cycle execution
64KB ROM; 14KB RAM
„
„
Internal Regulator for 1.8V core operation
Optimized pinout improves signal routing, easing
implementation and allowing for improved signal integrity
SMSC USB2244/USB2244i
DATASHEET
Revision 1.0 (05-27-08)
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Table of Contents
Chapter 1 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 3 Pin Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
36-Pin Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 4 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 5 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 6 Pin Reset State Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Chapter 7 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maximum Guaranteed Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 8 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 9 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 10 GPIO Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SMSC USB2244/USB2244i
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Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
List of Figures
Figure 2.1 USB2244/USB2244i Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4.1 USB2244/USB2244i 36 Pin QFN Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6.1 Pin Reset States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6.2 Legend for Pin Reset States Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7.1 Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 8.2 Formula to Find Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9.1 USB2244/USB2244i 36-QFN, 6x6mm Body, 0.5mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
List of Tables
Table 3.1 USB2244/2244i 36-Pin QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 5.3 USB2244/USB2244i Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6.1 USB2244/USB2244i Pin Reset States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 7.1 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SMSC USB2244/USB2244i
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Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 1 Acronyms
MMC: MultiMediaCard
PLL: Phase-Locked Loop
QFN: Quad Flat no Leads
RoHS: Restriction of Hazardous Substances Directive
SD: Secure Digital
SDIO: Secure Digital Input/Output
SDC: Secure Digital Controllerl
SIE: Serial Interface Engine
*Note: In order to develop, make, use, or sell readers and/or other products using or incorporating any of the SMSC devices made
the subject of this document or to use related SMSC software programs, technical information and licenses under patent and other
intellectual property rights from or through various persons or entities, including without limitation media standard companies,
forums, and associations, and other patent holders may be required. These media standard companies, forums, and associations
include without limitation the following: Sony Corporation (Memory Stick, Memory Stick Pro); SD3 LLC (Secure Digital); MultiMedia
Card Association (MultiMediaCard); the SSFDC Forum (SmartMedia); the Compact Flash Association (Compact Flash); and Fuji
Photo Film Co., Ltd., Olympus Optical Co., Ltd., and Toshiba Corporation (xD-Picture Card). SMSC does not make such licenses
or technical information available; does not promise or represent that any such licenses or technical information will actually be
obtainable from or through the various persons or entities (including the media standard companies, forums, and associations), or
with respect to the terms under which they may be made available; and is not responsible for the accuracy or sufficiency of, or
otherwise with respect to, any such technical information.
SMSC's obligations (if any) under the Terms of Sale Agreement, or any other agreement with any customer, or otherwise, with
respect to infringement, including without limitation any obligations to defend or settle claims, to reimburse for costs, or to pay
damages, shall not apply to any of the devices made the subject of this document or any software programs related to any of such
devices, or to any combinations involving any of them, with respect to infringement or claimed infringement of any existing or future
patents related to solid state disk or other flash memory technology or applications ("Solid State Disk Patents"). By making any
purchase of any of the devices made the subject of this document, the customer represents, warrants, and agrees that it has
obtained all necessary licenses under then-existing Solid State Disk Patents for the manufacture, use and sale of solid state disk
and other flash memory products and that the customer will timely obtain at no cost or expense to SMSC all necessary licenses
under Solid State Disk Patents; that the manufacture and testing by or for SMSC of the units of any of the devices made the subject
of this document which may be sold to the customer, and any sale by SMSC of such units to the customer, are valid exercises of
the customer's rights and licenses under such Solid State Disk Patents; that SMSC shall have no obligation for royalties or otherwise
under any Solid State Disk Patents by reason of any such manufacture, use, or sale of such units; and that SMSC shall have no
obligation for any costs or expenses related to the customer's obtaining or having obtained rights or licenses under any Solid State
Disk Patents.
SMSC MAKES NO WARRANTIES, EXPRESS, IMPLIED, OR STATUTORY, IN REGARD TO INFRINGEMENT OR OTHER
VIOLATION OF INTELLECTUAL PROPERTY RIGHTS. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES
AGAINST INFRINGEMENT AND THE LIKE.
No license is granted by SMSC expressly, by implication, by estoppel or otherwise, under any patent, trademark, copyright, mask
work right, trade secret, or other intellectual property right.
**To obtain this software program the appropriate SMSC Software License Agreement must be executed and in effect. Forms of
these Software License Agreements may be obtained by contacting SMSC.
Revision 1.0 (05-27-08)
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 2 Block Diagram
AUTO_
CBW
PROC
USB
Host
FMI
Media
Interface
SIE
CTL
SD/
MMC
BUS
INTFC
BUS
INTFC
FMDU
CTL
PHY
EP0 TX
EP0 RX
BUS
INTFC
RAM
4K
total
EP1 RX
EP1 TX
EP2 RX
EP2 TX
XDATA BRIDGE
+ BUS ARBITER
PWR_FET1
GPIO10(CARD_PWR)
GPIOs
7 pins
RAM
10KB
Program
Memory
I/O Bus
ADDR
MAP
ROM
64KB
Clock
Generation and
Control
SFR
RAM
8051
PROCESSOR
Figure 2.1 USB2244/USB2244i Block Diagram
SMSC USB2244/USB2244i
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Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 3 Pin Table
3.1
36-Pin Package
Table 3.1 USB2244/2244i 36-Pin QFN Package
SD/MMC INTERFACE (12 Pins)
SD_D0
SD_D4
SD_D1
SD_D5
SD_D2
SD_D3
SD_D7
SD_D6
SD_CLK
SD_CMD
SD_WP
GPIO15 (SD_nCD)
USB INTERFACE (7 PINS)
USB+
USB-
RBIAS
XTAL1 (CLKIN)
XTAL2
VDDA33
VDD18PLL
MISC (13 PINS)
GPIO1 (LED1)
GPIO10 (CRD_PWR)
TEST
GPIO2 / RXD / SDA
GPIO12
GPIO4
GPIO7 / TXD / SCK
(4) NC
GPIO14
nRESET
DIGITAL, POWER (4 PINS)
(3)VDD33
VDD18
TOTAL 36
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 4 Pin Configuration
28
29
30
31
32
33
34
35
36
18
17
16
15
14
13
12
11
10
nRESET
NC
TEST
GPIO4
NC
SD_WP
NC
GPIO7 / TXD / SCK
XTAL2
SMSC
USB2244/2244i
(Top View QFN-36)
VDD33
VDD18
NC
XTAL1 (CLKIN)
VDD18PLL
RBIAS
Thermal Slug
(must be connected to VSS)
SD_CMD
SD_D5
VDDA33
Indicates pins on the bottom of the device.
Figure 4.1 USB2244/USB2244i 36 Pin QFN Diagram
SMSC USB2244/USB2244i
9
Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 5 Pin Descriptions
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “n” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “n” is not present before the signal name, the signal is asserted at the
high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
5.1
Pin Descriptions
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions
36-PIN
QFN
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
SECURE DIGITAL INTERFACE
SD Data
SD_D[7:0]
7
8
10
20
23
25
4
I/O12PU
The bi-directional signals should have weak
pull-up resistors. The register can be
controlled by: SD_MMC_INTF_EN bit of
SDC_MODE_CTL
5
SD Clock
SD_CLK
SD_CMD
9
O12
This is an output clock signal to SD/MMC
device.
The clock frequency is software configurable.
SD Command
11
I/O12PU
This is a bi-directional signal that connects to
the CMD signal of SD/MMC device. The bi-
directional signal should have an internal weak
pull-up resistor.
The pull-up register can be controlled by:
SD_MMC_INTF_EN bit of SDC_MODE CTL
SD Write Protect SD_nWP
30
26
I/O12
I/O12
This pin is designated as the Secure Digital
card mechanical write detect pin.
SD Card Detect
GPIO
GPIO15
(SD_nCD)
This is a GPIO designated as the Secure
Digital card detection pin.
USB INTERFACE
USB Bus Data
USB+
USB-
2
3
I/O-U
These pins connect to the USB bus data
signals.
USB Transceiver
Bias
RBIAS
35
I-R
A 12.0k , 1.0% resistor is attached from VSSA
to this pin in order to set the transceiver's
internal bias currents.
Revision 1.0 (05-27-08)
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)
36-PIN
QFN
BUFFER
TYPE
NAME
SYMBOL
XTAL1
DESCRIPTION
24MHz Crystal
or external clock
input
33
ICLKx
This pin can be connected to one terminal of
the crystal or it can be connected to an external
24 clock when a crystal is not used.
(CLKIN)
24MHz Crystal
XTAL2
32
OCLKx
This is the other terminal of the crystal, or it can
be left open when an external clock source is
used to drive XTAL1(CLKIN). It may not be
used to drive any external circuitry other than
the crystal circuit.
3.3V Analog
Power
VDDA33
36
34
3.3V Analog Power
1.8V PLL Power
VDD18PLL
This pin is the 1.8V Power for the PLL.
+1.8V Filtered analog power for internal PLL.
This pin must have a 1.0μF(or greater) ±20%
(ESR <0.1Ω) capacitor to VSS.
MISC
General Purpose
I/O
GPIO1 (LED1)
1
I/O12
This pin may be used either as input, edge
sensitive interrupt input, or output.
In addition, as an output, the GPIO1 can use
output controlled by the LED1_GPIO1 register.
General Purpose
I/O
GPIO2 / RXD /
SDA
27
I/O12
I
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
RXD: In addition to the above, the signal can
be used as input to the RXD of UART in the
device, when the TXD_RXD_SEL bit in
UTIL_CONFIG1 register is cleared to "0".
I/O12
I/O12
I/O12
O12
SDA: This is the data pin when used with an
external serial EEPROM.
General Purpose
I/O
GPIO4
29
31
This pin may be used either as input, edge
sensitive interrupt input, or output.
General Purpose
I/O
GPIO7 /
TXD /
SCK
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
TXD: In addition, as an output, the GPIO7 can
be used as an output TXD of UART in the
device, when the GPIO2/TXD bit in
UTL_CONFIG register is set to "1"
O12
SCK: This is the clock output when used with
an external EEPROM.
General Purpose
I/O
GPIO10
(CRD_PWR)
21
I/O200
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
CRD_PWR: Card Power drive of 3.3V @ either
100mA or 200mA.
General Purpose
I/O
GPIO14
nRESET
19
18
I/O12
IS
This pin may be used either as input, edge
sensitive interrupt input, or output.
RESET Input
This active low signal is used by the system to
reset the chip. The active low pulse should be
at least 1μs wide.
SMSC USB2244/USB2244i
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Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Table 5.2 USB2244/2244i 36-Pin QFN Pin Descriptions (continued)
36-PIN
QFN
BUFFER
TYPE
NAME
SYMBOL
TEST
DESCRIPTION
TEST Input
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 Connects
NC
No Connect. No trace or signal should be
routed/attached to these pins.
DIGITAL / POWER
+1.8V Core
power
VDD18
13
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 &
VDD33
VSS
6
14
22
3.3V Power & Regulator Input.
Regulator Input.
Ground
SLUG
Ground Reference
5.2
Buffer Type Descriptions
Table 5.3 USB2244/USB2244i Buffer Type Descriptions
DESCRIPTION
BUFFER
I
Input.
IS
Input with Schmitt trigger.
I/O12
I/O200
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.
I/O12PU
O12
Input/Output buffer with 12mA sink and 12mA source with a pull-up resistor.
Output buffer with 12mA source.
XTAL clock input.
ICLKx
OCLKx
I/O-U
I-R
XTAL clock output.
Analog Input/Output Defined in USB specification.
RBIAS.
Revision 1.0 (05-27-08)
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 6 Pin Reset State Table
Hardware
Firmware
Initialization
Operational
Voltage
Signal (v)
RESET
RESET
VDD33
Time
(t)
VSS
Figure 6.1 Pin Reset States
LEGEND
yes
--
hardware enables function
hardware disables function
hardware disables output driver
hardware enables pullup
z
pu
pd
hardware enables pulldown
hw
hardware controls function, but state is protocol dependent
firmware controls function through registers
hardware supplies power through pin, applicable only to CARD_PWR pins
hardware disables pad
(fw)
VDD
none
Figure 6.2 Legend for Pin Reset States Table
SMSC USB2244/USB2244i
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Revision 1.0 (05-27-08)
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
6.1
36-Pin Reset States
Table 6.1 USB2244/USB2244i Pin Reset States
Post-Reset State
SD Mode
RESET STATE
OUT-
PUT
PU/
PD
IN-
PUT
OUT-
PUT
PU/
PD
IN-
PUT
PIN
PIN NAME
FUNCTION
FUNCTION
8
SD_D6
SD_D7
SD_D0
SD_D1
SD_WP
SD_D2
SD_D3
SD_D4
SD_CLK
SD_D5
SD_CMD
none
none
none
none
SD_WP
none
none
none
none
none
none
z
z
z
z
0
z
z
z
z
z
z
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
SD_D6
SD_D7
SD_D0
SD_D1
SD_WP
SD_D2
SD_D3
SD_D4
SD_CLK
SD_D5
SD_CMD
hw
hw
hw
hw
(fw)
hw
hw
hw
hw
hw
hw
pu
pu
pu
pu
(fw)
pu
pu
pu
--
yes
yes
yes
yes
(fw)
yes
yes
yes
yes
yes
yes
7
5
4
30
25
23
20
9
10
11
pu
pu
19
26
24
27
29
31
21
28
18
1
GPIO14
GPIO15 (SD_nCD)
GPIO12
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
TEST
nRESET
GPIO1
none
z
z
z
0
0
0
z
z
z
pu
pu
pu
--
yes
yes
yes
--
GPIO2 / RXD / SDA
GPIO4
RXD
z
pu
yes
--
--
GPIO7 / TXD / SCK
GPIO10(CARD_PWR)
TEST
TXD
hw
--
--
--
--
--
--
PWR
VDD
--
--
--
yes
yes
nRESET
--
GPIO1 (LED1)
NC
0
z
--
--
--
--
17:15
12
2
none
none
z
z
--
--
--
--
NC
none
z
z
z
--
--
--
--
--
--
USB+
USB+
USB-
3
USB-
35
33
32
RBIAS
XTAL1 (CLKIN)
XTAL2
Revision 1.0 (05-27-08)
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SMSC USB2244/USB2244i
DATASHEET
Ultra Fast USB 2.0 SD/MMC Flash Media Controller
Datasheet
Chapter 7 DC Parameters
7.1
Maximum Guaranteed Ratings
PARAMETER
SYMBOL
MIN
MAX
UNITS
°C
COMMENTS
Storage
Temperature
T
-55
150
325
4.0
A
Lead
Temperature
°C
V
Soldering < 10 seconds
3.3V supply
voltage
V
V
-0.5
-0.5
DD33,
DDA33
Voltage on
USB+ and
USB- pins
(3.3V supply voltage + 2) ≤ 6
V
Voltage on
GPIO10
-0.5
V
+ 0.3
V
When internal power FET
DD33
operation of this pin is enabled,
this pin may be simultaneously
shorted to ground or any
voltage up to 3.63V indefinitely,
without damage to the device
as long as V
and V
DD33
DDA33
are less than 3.63V and T is
A
o
less than 70 C.
Voltage on any
signal pin
-0.5
-0.5
-0.5
V
+ 0.3
+ 0.3
V
V
V
DD33
Voltage on
XTAL1
4.0
Voltage on
XTAL2
V
DD18
Note 7.1 Stresses above the specified parameters may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at any condition above
those indicated in the operation sections of this specification is not implied.
Note 7.2 When powering this device from laboratory or system power supplies, it is important that
the Absolute Maximum Ratings not be exceeded or device failure can result. Some power
supplies exhibit voltage spikes on their outputs when the AC power is switched on or off.
In addition, voltage transients on the AC power line may appear on the DC output. When
this possibility exists, it is suggested that a clamp circuit be used.
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Voltage
VDD33
tRT
3.3V
100%
90%
10%
VSS
t90%
Time
t10%
Figure 7.1 Supply Rise Time Model
7.2
Recommended Operating Conditions
PARAMETER
SYMBOL
MIN
MAX
UNITS
COMMENTS
Operating
Temperature
Commercial Part
Industrial Part
T
0
70
85
3.6
°C
°C
V
A
T
-40
3.0
A
3.3V supply voltage
V
V
DD33,
DDA33
3.3V supply rise time
t
0
400
5.5
μs
RT
Voltage on
USB+ and USB- pins
-0.3
V
If any 3.3V supply voltage drops
below 3.0V, then the MAX
becomes:
(3.3V supply voltage) + 0.5 ≤ 5.5
Voltage on any signal
pin
-0.3
V
V
DD33
Voltage on XTAL1
Voltage on XTAL2
-0.3
-0.3
V
V
V
V
DDA33
DD18
Note 7.3 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.
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7.3
DC Electrical Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
COMMENTS
I, IPU, IPD Type Input Buffer
Low Input Level
V
0.8
V
V
TTL Levels
ILI
High Input Level
V
2.0
IHI
Pull Down
PD
PU
72
58
μA
μA
Pull Up
IS Type Input Buffer
Low Input Level
High Input Level
V
0.8
V
V
TTL Levels
ILI
V
2.0
IHI
Hysteresis
V
420
mV
HYSI
ICLK Input Buffer
Low Input Level
High Input Level
Input Leakage
V
0.5
V
V
ILCK
V
1.4
-10
IHCK
I
+10
μA
IL
V
= 0 to V
DD33
IN
Input Leakage
(All I and IS buffers)
Low Input Leakage
I
-10
-10
+10
+10
μA
V
V
= 0
IL
IN
High Input Leakage
I
μA
= V
IH
IN
DD33
O12 Type Buffer
Low Output Level
High Output Level
Output Leakage
V
0.4
V
V
I
V
= 12mA @
OL
OL
OH
OL
= 3.3V
DD33
V
V
- 0.4
I
V
= -12mA @
OH
DD33
= 3.3V
DD33
I
-10
+10
μA
V
= 0 to V
IN DD33
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PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
COMMENTS
I/O12, I/O12PU & I/O12PD Type
Buffer
Low Output Level
High Output Level
Output Leakage
V
0.4
V
V
I
V
= 12mA @
OL
OL
OH
OL
= 3.3V
DD33
V
V
- 0.4
I
V
= -12mA @
OH
DD33
= 3.3V
DD33
I
-10
+10
µA
V
= 0 to V
IN DD33
Pull Down
Pull Up
PD
PU
72
58
μA
μA
IO-U
I-R
I/O200
Integrated Power FET for
GPIO10
High Output Current Mode
I
I
200
100
mA
mA
Vdrop
Vdrop
= 0.46V
= 0.23V
OUT
FET
Low Output Current Mode
OUT
FET
On Resistance
R
t
2.1
Ω
I
= 70mA
FET
DSON
Output Voltage Rise Time
Supply Current Unconfigured
Supply Current Active
Full Speed
800
90
μs
C
= 10μF
DSON
LOAD
I
80
mA
CCINIT
I
I
110
135
140
165
mA
mA
CC
CC
High Speed
Supply Current Suspend
Industrial Temperature Suspend
I
350
350
700
900
µA
µA
CSBY
I
CSBYI
Note 7.4 Output leakage is measured with the current pins in high impedance.
Note 7.5 See The USB 2.0 Specification, Chapter 7, for USB DC electrical characteristics
Note 7.6 RBIAS is a 3.3V tolerant analog pin.
Note 7.7 Output current range is controlled by program software, software disables FET during short
circuit condition.
Note 7.8 The assignment of each Integrated Card Power FET to a designated Card Connector is
controlled by both firmware and the specific board implementation. Firmware will default to
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Note 7.9 The 3.3V supply should be at least at 75% of its operating condition before the 1.8V supply
is allowed to ramp up.
7.4
Capacitance
T
= 25°C; fc = 1MHz; V
V
= 1.8V
A
DD, DDP
Table 7.1 Pin Capacitance
LIMITS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
TEST CONDITION
Clock Input Capacitance
C
2
pF
All pins (except USB pins
and pins under test) are tied
to AC ground.
XTAL
Input Capacitance
Output Capacitance
C
10
20
pF
pF
IN
C
OUT
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Chapter 8 AC Specifications
8.1
Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ± 100ppm.
External Clock: 50% Duty cycle ± 10%, 24 MHz ± 100ppm, Jitter < 100ps rms.
XTAL1
(CS1 =
CB + CXTAL
)
C1
1Meg
Crystal
CL
C2
XTAL2
(CS2 =
CB + CXTAL
)
Figure 8.1 Typical Crystal Circuit
Note:
C
equals total board/trace capacitance.
B
(C1 + CS1) x (C2 + CS2)
(C1 + CS1 + C2 + CS2)
CL
=
Figure 8.2 Formula to Find Value of C and C
1
2
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Chapter 10 GPIO Usage
Table 10.1 USB2244/USB2244i GPIO Usage (ROM Rev 0x00)
NAME
ACTIVE LEVEL
SYMBOL
DESCRIPTION AND NOTE
LED indicator
GPIO1
GPIO2
H
H
LED1
RXD / SDA
Receive Port of Debugger / Serial
EEPROM Data
GPIO4
GPIO7
USER
H
GPIO
User defined
TXD / SCK
Transmit Port of Debugger / Serial
EEPROM Clock
GPIO10
GPIO12
GPIO14
GPIO15
L
CRD_PWR
GPIO
Card Power Control
User defined
USER
USER
L
GPIO
User defined
SD_nCD
Secure Digital card detect
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