Cypress Computer Hardware CY7C68000A User Manual

CY7C68000A  
MoBL-USB™ TX2 USB 2.0 UTMI  
Transceiver  
Supports transmission of Resume Signaling  
3.3V Operation  
MoBL-USBTX2 Features  
UTMI-compliant and USB 2.0 certified for device operation  
Two package options: 56-pin QFN and 56-pin VFBGA  
Operates in both USB 2.0 High Speed (HS), 480 Mbits/second,  
and Full Speed (FS), 12 Mbits/second  
All required terminations, including 1.5 Kohm pull up on  
DPLUS, are internal to chip  
®
Optimized for Seamless Interface with Intel Monahans Appli-  
cations Processors  
Supports USB 2.0 Test Modes  
The Cypress MoBL-USB TX2 is a Universal Serial Bus (USB)  
specification revision 2.0 transceiver, serial and deserializer, to a  
parallel interface of either 16 bits at 30 MHz or eight bits at 60  
MHz. The MoBL-USB TX2 provides a high speed physical layer  
interface that operates at the maximum allowable USB 2.0  
bandwidth. This enables the system designer to keep the  
complex high speed analog USB components external to the  
digital ASIC. This decreases development time and associated  
risk. A standard USB 2.0-certified interface is provided and is  
compliant with Transceiver Macrocell Interface (UTMI) specifi-  
cation version 1.05 dated 3/29/2001.  
Tri-state Mode enables sharing of UTMI Bus with other devices  
Serial-to-Parallel and Parallel-to-Serial Conversions  
8-bit Unidirectional, 8-bit Bidirectional, or 16-bit Bidirectional  
External Data Interface  
Synchronous Field and EOP Detection on Receive Packets  
Synchronous Field and EOP Generation on Transmit Packets  
Data and Clock Recovery from the USB Serial Stream  
Bit stuffing and unstuffing; Bit Stuff Error Detection  
This product is also optimized to seamlessly interface with  
Monahans -P & -L applications processors. It has been charac-  
terized by Intel and is recommended as the USB 2.0 UTMI trans-  
ceiver of choice for its Monahans processors. It is also capable  
of tri-stating the UTMI bus, while suspended, to enable the bus  
to be shared with other devices.  
Staging Register to manage Data Rate variation due to Bit  
stuffing and unstuffing  
16-bit 30 MHz and 8-bit 60 MHz Parallel Interface  
Ability to switch between FS and HS terminations and signaling  
Supports detection of USB Reset, Suspend, and Resume  
Two packages are defined for the family: 56-pin QFN and 56-pin  
VFBGA.  
Supports HSidentification and detection as defined bythe USB  
2.0 Specification  
The functional block diagram follows.  
Logic Block Diagram  
Tri_state  
Cypress Semiconductor Corporation  
Document #: 38-08052 Rev. *G  
198 Champion Court  
San Jose, CA 95134-1709  
408-943-2600  
Revised October 5, 2008  
 
CY7C68000A  
Mode 0 enables the transceiver to operate with normal USB data  
decoding and encoding.  
Operational Modes  
The operational modes are controlled by the OpMode signals.  
The OpMode signals are capable of inhibiting normal operation  
of the transceiver and evoking special test modes. These modes  
take effect immediately and take precedence over any pending  
data operations. The transmission data rate when in OpMode  
depends on the state of the XcvrSelect input.  
Mode 1 enables the transceiver logic to support a soft disconnect  
feature that tri-states both the HS and FS transmitters, and  
removes any termination from the USB, making it appear to an  
upstream port that the device is disconnected from the bus.  
Mode 2 disables Bit Stuff and NRZI encoding logic so ‘1’s loaded  
from the data bus becomes ‘J’s on the DPLUS/DMINUS lines  
and ‘0’s become ‘K’s.  
OpMode[1:0]  
Mode  
Description  
Normal operation  
00  
01  
10  
0
1
2
DPLUS/DMINUS Impedance Termination  
Non-driving  
The CY7C68000A does not require external resistors for USB  
data line impedance termination or an external pull up resistor on  
the DPLUS line. These resistors are incorporated into the part.  
They are factory trimmed to meet the requirements of USB 2.0.  
Incorporating these resistors also reduces the pin count on the  
part.  
Disable Bit Stuffing and NRZI  
encoding  
11  
3
Reserved  
Document #: 38-08052 Rev. *G  
Page 3 of 15  
 
CY7C68000A  
Pin Configurations  
The following pages illustrate the individual pin diagrams that are available in the 56-pin QFN and 56-pin VFBGA packages.  
The packages offered use either an 8-bit (60 MHz) or 16-bit (30 MHz) bus interface.  
Figure 1. CY7C68000A 56-pin QFN Pin Assignment  
GND  
D5  
TXReady  
Suspend  
Reset  
1
2
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
Reserved  
D6  
3
AV  
4
CC  
D7  
XTALOUT  
XTALIN  
AGND  
5
D8  
6
CY7C68000A  
56-pin QFN  
D9  
7
Reserved  
D10  
AV  
8
CC  
DPLUS  
DMINUS  
9
D11  
10  
11  
12  
13  
14  
V
AGND  
CC  
D12  
GND  
D13  
XcvrSelect  
TermSelect  
OpMode0  
Document #: 38-08052 Rev. *G  
Page 4 of 15  
 
CY7C68000A  
Figure 2. CY7C68000A 56-pin VFBGA Pin Assignment  
1
2
3
4
5
6
7
8
1A  
1B  
1C  
2A  
2B  
2C  
3A  
3B  
3C  
4A  
4B  
4C  
5A  
5B  
5C  
6A  
6B  
6C  
7A  
7B  
7C  
8A  
8B  
8C  
A
B
C
D
1D  
2D  
7D  
8D  
1E  
1F  
1G  
1H  
2E  
2F  
2G  
2H  
7E  
7F  
7G  
7H  
8E  
8F  
8G  
8H  
E
3F  
4F  
5F  
6F  
F
G
H
3G  
3H  
4G  
4H  
5G  
5H  
6G  
6H  
Document #: 38-08052 Rev. *G  
Page 5 of 15  
 
CY7C68000A  
Pin Descriptions  
Table 1. Pin Descriptions  
QFN VFBGA  
Name  
AVCC  
Type  
Power  
Power  
Power  
Power  
I/O/Z  
I/O/Z  
I/O  
Default  
N/A  
N/A  
N/A  
N/A  
Z
Description  
Analog V This signal provides power to the analog section of the chip.  
4
H1  
H5  
H4  
H8  
H6  
H7  
G8  
G7  
G5  
G3  
G2  
F8  
F6  
F5  
F4  
F3  
F1  
G4  
E1  
D8  
G1  
E2  
A1  
CC  
8
AVCC  
AGND  
AGND  
DPLUS  
DMINUS  
D0  
Analog V This signal provides power to the analog section of the chip.  
CC  
7
Analog Ground Connect to ground with as short a path as possible.  
Analog Ground Connect to ground with as short a path as possible.  
USB DPLUS Signal Connect to the USB DPLUS signal.  
11  
9
10  
49  
48  
46  
44  
43  
41  
39  
38  
37  
36  
34  
33  
31  
29  
27  
26  
50  
Z
USB DMINUS Signal Connect to the USB DMINUS signal.  
Bidirectional Data Bus This bidirectional bus is used as the entire data  
bus in the 8-bit bidirectional mode or the least significant eight bits in the  
16-bit mode. Under the 8-bit unidirectional mode, these bits are used as  
inputs for data, selected by the RxValid signal.  
D1  
I/O  
D2  
I/O  
D3  
I/O  
D4  
I/O  
D5  
I/O  
D6  
I/O  
D7  
I/O  
D8  
I/O  
Bidirectional Data Bus This bidirectional bus is used as the upper eight  
bits of the data bus when in the 16-bit mode, and not used when in the  
8-bit bidirectional mode. Under the 8-bit unidirectional mode these bits  
are used as outputs for data, selected by the TxValid signal.  
D9  
I/O  
D10  
D11  
D12  
D13  
D14  
D15  
CLK  
I/O  
I/O  
I/O  
I/O  
I/O  
I/O  
Output  
Clock This output is used for clocking the receive and transmit parallel  
data on the D[15:0] bus.  
3
B2  
B3  
Reset  
Input  
Input  
N/A  
N/A  
Active HIGH Reset Resets the entire chip. This pin can be tied to V  
CC  
through a 0.1-μF capacitor and to GND through a 100 K resistor for a  
10-ms RC time constant.  
12  
XcvrSelect  
Transceiver Select This signal selects between the Full Speed (FS) and  
the High Speed (HS) transceivers:  
0: HS transceiver enabled  
1: FS transceiver enabled  
13  
2
B4  
B1  
TermSelect  
Suspend  
Input  
Input  
N/A  
N/A  
Termination Select This signal selects between the Full Speed (FS) and  
the High Speed (HS) terminations:  
0: HS termination  
1: FS termination  
Suspend Places the CY7C68000A in a mode that draws minimal power  
from supplies. Shuts down all blocks not necessary for Suspend/Resume  
operations. While suspended, TermSelect must always be in FS mode  
to ensure that the 1.5 Kohm pull up on DPLUS remains powered.  
0: CY7C68000A circuitry drawing suspend current  
1: CY7C68000A circuitry drawing normal current  
Note  
1. Unused inputs should not be left floating. Tie either HIGH or LOW as appropriate. Outputs that are three-statable should only be pulled up or down to ensure  
signals at power-up and in standby.  
Document #: 38-08052 Rev. *G  
Page 6 of 15  
 
 
CY7C68000A  
Table 1. Pin Descriptions (continued)  
[1]  
QFN VFBGA  
Name  
Tri_state  
Type  
Default  
Description (continued)  
24  
B8  
Input  
Tri-state Mode Enable Places the CY7C68000A into Tri-state mode  
which tri-states all outputs and IOs. Tri-state Mode can only be enabled  
while suspended.  
0: Disables Tri-state Mode  
1: Enables Tri-state Mode  
19  
C2  
LineState1  
Output  
Line State These signals reflect the current state of the single-ended  
receivers. They are combinatorial until a “usable” CLK is available then  
they are synchronized to CLK. They directly reflect the current state of the  
DPLUS (LineState0) and DMINUS (LineState1).  
D– D+ Description  
0 0 0: SE0  
0 1 1: ‘J’ State  
1 0 2: ‘K’ State  
1 1 3: SE1  
18  
C1  
LineState0  
Output  
Line State These signals reflect the current state of the single-ended  
receivers. They are combinatorial until a ‘usable’ CLK is available then  
they are synchronized to CLK. They directly reflect the current state of the  
DPLUS (LineState0) and DMINUS (LineState1).  
D– D+ Description  
00–0: SE0  
01–1: ‘J’ State  
10–2: ‘K’ State  
11–3: SE1  
15  
14  
54  
B6  
B5  
A5  
OpMode1  
OpMode0  
TXValid  
Input  
Input  
Input  
Operational Mode These signals select among various operational  
modes.  
10 Description  
00–0: Normal Operation  
01–1: Non-driving  
10–2: Disable Bit Stuffing and NRZI encoding  
11–3: Reserved  
Operational Mode These signals select among various operational  
modes.  
10 Description  
00–0: Normal Operation  
01–1: Non-driving  
10–2: Disable Bit Stuffing and NRZI encoding  
11–3: Reserved  
Transmit Valid This signal indicates that the data bus is valid. The asser-  
tion of Transmit Valid initiates SYNC on the USB. The negation of Trans-  
mit Valid initiates EOP on the USB. The start of SYNC must be initiated  
on the USB no less than one or no more that two CLKs after the assertion  
of TXValid.  
In HS (XcvrSelect = 0) mode, the SYNC pattern must be asserted on the  
USB between 8- and 16-bit times after the assertion of TXValid is detected  
by the Transmit State Machine.  
In FS (Xcvr = 1), the SYNC pattern must be asserted on the USB no less  
than one or more than two CLKs after the assertion of TXValid is detected  
by the Transmit State Machine.  
1
A8  
TXReady  
Output  
Transmit Data Ready If TXValid is asserted, the SIE must always have  
data available for clocking in to the TX Holding Register on the rising edge  
of CLK. If TXValid is TRUE and TXReady is asserted at the rising edge  
of CLK, the CY7C68000A loads the data on the data bus into the TX  
Holding Register on the next rising edge of CLK. At that time, the SIE  
should immediately present the data for the next transfer on the data bus.  
Document #: 38-08052 Rev. *G  
Page 7 of 15  
 
CY7C68000A  
Table 1. Pin Descriptions (continued)  
[1]  
QFN VFBGA  
Name  
RXValid  
Type  
Default  
Description (continued)  
21  
A4  
Output  
Receive Data Valid This signal indicates that the DataOut bus has valid  
data. The Receive Data Holding Register is full and ready to be unloaded.  
The SIE is expected to latch the DataOut bus on the clock edge.  
22  
B7  
RXActive  
Output  
Receive Active This signal indicates that the receive state machine has  
detected SYNC and is active.  
RXActive is negated after a bit stuff error or an EOP is detected.  
23  
56  
A6  
A7  
RXError  
ValidH  
Output  
I/O  
Receive Error  
0 Indicates no error.  
1 Indicates that a receive error has been detected.  
ValidH This signal indicates that the high-order eight bits of a 16-bit data  
word presented on the Data bus are valid. When DataBus16_8 = 1 and  
TXValid = 0, ValidH is an output, indicating that the high-order receive  
data byte on the Data bus is valid. When DataBus16_8 = 1 and TXValid  
= 1, ValidH is an input and indicates that the high-order transmit data byte,  
presented on the Data bus by the transceiver, is valid. When  
DataBus16_8 = 0, ValidH is undefined. The status of the receive  
low-order data byte is determined by RXValid and are present on D0–D7.  
51  
A2  
H3  
DataBus16_8  
Input  
Input  
Data Bus 16_8 This signal selects between 8- and 16-bit data transfers.  
1–16-bit data path operation enabled. CLK = 30 MHz.  
0–8-bit data path operation enabled. When Uni_Bidi = 0, D[8:15] are un-  
defined. When Uni_Bidi =1, D[0:7] are valid on TxValid and D[8:15] are  
valid on RxValid. CLK = 60 MHz  
Note: DataBus16_8 is static after Power-on Reset (POR) and is only  
sampled at the end of Reset.  
6
XTALIN  
N/A  
N/A  
Crystal Input Connect this signal to a 24 MHz parallel-resonant, funda-  
mental mode crystal and 30 pF capacitor to GND.  
It is also correct to drive XTALIN with an external 24 MHz square wave  
derived from another clock source.  
5
H2  
A3  
XTALOUT  
Uni_Bidi  
Output  
Input  
Crystal Output Connect this signal to a 24 MHz parallel-resonant, funda-  
mental mode crystal and 30 pF (nominal) capacitor to GND. If an external  
clock is used to drive XTALIN, leave this pin open.  
52  
Driving this pin HIGH enables the unidirectional mode when the 8-bit  
interface is selected. Uni_Bidi is static after power-on reset (POR).  
55  
17  
28  
32  
45  
53  
16  
20  
30  
42  
47  
40  
35  
25  
C6  
C7  
D7  
E7  
E8  
C4  
C5  
C3  
D1  
D2  
G6  
F7  
F2  
C8  
V
V
V
V
V
Power  
Power  
Power  
Power  
Power  
Ground  
Ground  
Ground  
Ground  
Ground  
INPUT  
INPUT  
INPUT  
INPUT  
V
V
V
V
V
. Connect to 3.3V power source.  
. Connect to 3.3V power source.  
. Connect to 3.3V power source.  
. Connect to 3.3V power source.  
. Connect to 3.3V power source.  
CC  
CC  
CC  
CC  
CC  
CC  
CC  
CC  
CC  
CC  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
GND  
Ground.  
GND  
Ground.  
GND  
Ground.  
GND  
Ground.  
GND  
Ground.  
Reserved  
Reserved  
Reserved  
Reserved  
Connect pin to Ground.  
Connect pin to Ground.  
Connect pin to Ground.  
Connect pin to Ground.  
Document #: 38-08052 Rev. *G  
Page 8 of 15  
 
CY7C68000A  
Absolute Maximum Ratings  
Operating Conditions  
Storage Temperature ................................. –65°C to +150°C  
Ambient Temperature with Power Supplied ..... 0°C to +70°C  
Supply Voltage to Ground Potential ...............–0.5V to +4.0V  
DC Input Voltage to Any Input Pin ............................. 5.25 V  
DC Voltage Applied to Outputs  
T (Ambient Temperature Under Bias) ............ 0°C to +70°C  
A
Supply Voltage ...............................................+3.0V to +3.6V  
Ground Voltage ................................................................. 0V  
F
(Oscillator or Crystal Frequency) ... 24 MHz ± 100 ppm  
OSC  
................................................................... Parallel Resonant  
in High-Z State ..................................... –0.5V to V + 0.5V  
CC  
Power Dissipation .................................................... 630 mW  
Static Discharge Voltage ..........................................>2000V  
Max Output Current, per IO pin ................................... 4 mA  
Max Output Current, all 21–IO pins ............................ 84 mA  
DC Characteristics  
Table 2. DC Characteristics  
Parameter  
Description  
Supply Voltage  
Conditions  
Min  
3.0  
2
Typ  
Max  
3.6  
Unit  
V
V
3.3  
CC  
IH  
IL  
V
V
Input High Voltage  
Input Low Voltage  
5.25  
0.8  
V
–0.5  
V
I
Input Leakage Current  
Output Voltage High  
Output Low Voltage  
Output Current High  
Output Current Low  
Input Pin Capacitance  
0< V < V  
CC  
±10  
μA  
V
I
IN  
V
V
I
I
= 4 mA  
2.4  
OH  
OUT  
OUT  
= –4 mA  
0.4  
4
V
OL  
I
I
mA  
mA  
pF  
pF  
pF  
μA  
μA  
mA  
mA  
ms  
OH  
OL  
4
C
Except DPLUS/DMINUS/CLK  
DPLUS/DMINUS/CLK  
Output pins  
10  
15  
30  
273  
35  
175  
90  
IN  
C
I
Maximum Output Capacitance  
Suspend Current  
LOAD  
[2]  
Connected  
228  
8
SUSP  
[2]  
Disconnected  
I
I
t
Supply Current HS Mode  
Supply Current FS Mode  
Minimum Reset time  
Normal operation OPMOD[1:0] = 00  
Normal operation OPMOD[1:0] = 00  
CC  
CC  
1.9  
RESET  
Note  
2. Connected to the USB includes 1.5 Kohm internal pull up. Disconnected has the 1.5 Kohm internal pull up excluded.  
Document #: 38-08052 Rev. *G  
Page 9 of 15  
 
 
CY7C68000A  
AC Electrical Characteristics  
USB 2.0 Transceiver  
USB 2.0-compliant in FS and HS modes.  
Timing Diagram  
HS/FS Interface Timing - 60 MHz  
Figure 3. 60 MHz Interface Timing Constraints  
CLK  
TCH_MIN  
TCSU_MIN  
TDSU_MIN  
Control_In  
TDH_MIN  
DataIn  
TCCO  
TCDO  
Control_Out  
DataOut  
Table 3. 60 MHz Interface Timing Constraints Parameters  
Parameter  
Description  
Min  
4
Typ  
Max  
Unit  
Notes  
T
T
T
T
T
Minimum setup time for TXValid  
ns  
ns  
ns  
ns  
ns  
CSU_MIN  
CH_MIN  
DSU_MIN  
DH_MIN  
CCO  
Minimum hold time for TXValid  
1
Minimum setup time for Data (transmit direction)  
Minimum hold time for Data (transmit direction)  
4
1
Clock to Control out time for TXReady, RXValid,  
RXActive and RXError  
1
8
8
T
Clock to Data out time (Receive direction)  
1
ns  
CDO  
Document #: 38-08052 Rev. *G  
Page 10 of 15  
 
CY7C68000A  
HS/FS Interface Timing - 30 MHz  
Figure 4. 30 MHz Timing Interface Timing Constraints  
CLK  
TCH_MIN  
TCSU_MIN  
Control_In  
TDH_MIN  
TDSU_MIN  
DataIn  
Control_Out  
DataOut  
TCDO  
TCCO  
TCVO  
TVH_MIN  
TVSU_MIN  
Table 4. 30 MHz Timing Interface Timing Constraints Parameters  
Parameter  
Description  
Min  
16  
1
Typ  
Max  
Unit  
Notes  
T
T
T
T
T
Minimum setup time for TXValid  
ns  
ns  
ns  
ns  
ns  
CSU_MIN  
CH_MIN  
DSU_MIN  
DH_MIN  
CCO  
Minimum hold time for TXValid  
Minimum setup time for Data (Transmit direction)  
Minimum hold time for Data (Transmit direction)  
16  
1
Clock to Control Out time for TXReady, RXValid,  
RXActive and RXError  
1
20  
20  
T
T
T
T
Clock to Data out time (Receive direction)  
1
16  
1
ns  
ns  
ns  
ns  
CDO  
Minimum setup time for ValidH (transmit Direction)  
Minimum hold time for ValidH (Transmit direction)  
Clock to ValidH out time (Receive direction)  
VSU_MIN  
VH_MIN  
CVO  
1
20  
Figure 5. Tri-state Mode Timing Constraints  
Ttspd  
Ttssu Ttspd  
Suspend  
Tri-state  
Output / IO  
XXXX  
Hi-Z  
Table 5. Tri-state Mode Timing Constraints Parameters  
Parameter  
Description  
Minimum setup time for Tri-state  
Propagation Delay for Tri-State mode  
Min  
Typ  
Max  
Unit  
ns  
Notes  
T
T
0
tssu  
tspd  
50  
ns  
Document #: 38-08052 Rev. *G  
Page 11 of 15  
 
CY7C68000A  
Ordering Information  
Ordering Code  
Package Type  
CY7C68000A-56LFXC  
CY7C68000A-56BAXC  
CY3683  
56 QFN  
56 VFBGA  
MoBL-USB TX2 Development Board  
Package Diagrams  
The MoBL-USB TX2 is available in two packages:  
56-pin QFN  
56-pin VFBGA  
Figure 6. 56-Pin Quad Flatpack No Lead Package 8 x 8 mm (Sawn Version) LS56B  
51-85187 *C  
Document #: 38-08052 Rev. *G  
Page 12 of 15  
 
CY7C68000A  
Package Diagrams (continued)  
Figure 7. 56 VFBGA (5 x 5 x 1.0 mm) 0.50 Pitch, 0.30 Ball BZ56  
TOP VIEW  
BOTTOM VIEW  
Ø0.05 M C  
Ø0.15 M C A B  
Ø0.30 0.05(56X)  
A1 CORNER  
PIN A1 CORNER  
1
2
3
4
5
6
6
8
8
7
6
5
4
3
2
1
A
B
C
D
E
A
B
C
D
E
F
F
G
H
G
H
0.50  
3.50  
-B-  
-A-  
5.00 0.10  
SIDE VIEW  
5.00 0.10  
0.10(4X)  
REFERENCE JEDEC: MO-195C  
PACKAGE WEIGHT: 0.02 grams  
-C-  
SEATING PLANE  
001-03901-*B  
Connections between the USB connector shell and signal  
ground must be done near the USB connector  
PCB Layout Recommendations  
Follow these recommendations to ensure reliable, high-perfor-  
Bypass and flyback capacitors on VBus, near the connector,  
are recommended  
mance operation  
.
Afour-layer impedance controlled board is required to maintain  
signal quality  
Keep DPLUS and DMINUS trace lengths within 2 mm of each  
other in length, with preferred length of 20 to 30 mm  
Specify impedance targets (ask your board vendor what they  
can achieve)  
Maintain a solid ground plane under the DPLUS and DMINUS  
traces. Do not split the plane under these traces  
To control impedance, maintain trace widths and trace spacing  
to within written specifications  
Do not place vias on the DPLUS or DMINUS trace routing  
Isolate the DPLUS and DMINUS traces from all other signal  
traces by no less than 10 mm  
Minimize stubs to minimize reflected signals  
Note  
3. Source for recommendations: EZ-USB FX2™ PCB Design Recommendations, http:///www.cypress.com/cfuploads/support/app_notes/FX2_PCB.pdf  
High-Speed USB Platform Design Guidelines, http://www.usb.org/developers/docs/hs_usb_pdg_r1_0.pdf.  
Document #: 38-08052 Rev. *G  
Page 13 of 15  
 
 
CY7C68000A  
Quad Flat Package No Leads (QFN) Package  
Design Notes  
Electrical contact of the part to the Printed Circuit Board (PCB)  
is made by soldering the leads on the bottom surface of the  
package to the PCB. Hence, special attention is required to the  
heat transfer area below the package to provide a good thermal  
bond to the circuit board. A Copper (Cu) fill is to be designed into  
the PCB as a thermal pad under the package. Heat is transferred  
from the MoBL-USB TX2 through the device’s metal paddle on  
the package bottom. From here, heat is conducted to the PCB at  
the thermal pad. It is then conducted from the thermal pad to the  
PCB inner ground plane by an array of via. A via is a plated  
through-hole in the PCB with a finished diameter of 13 mil. The  
QFN’s metal die paddle must be soldered to the PCB’s thermal  
pad. Solder mask is placed on the board top, over each via, to  
resist solder flow into the via. The mask on the top side also  
minimizes outgassing during the solder reflow process.  
Note.pdf. The application note provides detailed information on  
board mounting guidelines, soldering flow, and rework process.  
Figure 8 displays a cross-sectional area under the package. The  
cross section is of only one via. The solder paste template needs  
to be designed to enable at least 50 percent solder coverage.  
The thickness of the solder paste template should be 5 mil. It is  
recommended that ‘No Clean’, type 3 solder paste be used for  
mounting the part. Nitrogen purge is recommended during  
reflow.  
Figure 9 is a plot of the solder mask pattern image of the  
assembly (darker areas indicate solder).  
Figure 8. Cross section of the Area Underneath the QFN Package  
0.017” dia  
Solder Mask  
Cu Fill  
Cu Fill  
0.013” dia  
PCB Material  
PCB Material  
Via hole for thermally connecting the  
This figure only shows the top three layers of the  
circuit board: Top Solder, PCB Dielectric, and  
the Ground Plane  
QFN to the circuit board ground plane.  
Figure 9. Plot of the Solder Mask (White Area)  
Document #: 38-08052 Rev. *G  
Page 14 of 15  
 
   
CY7C68000A  
Document History Page  
Document Title: CY7C68000A MoBL-USB™ TX2 USB 2.0 UTMI Transceiver  
Document Number: 38-08052  
Orig. of  
Change  
Submission  
Date  
REV.  
ECN NO.  
Description of Change  
**  
285592  
427959  
KKU  
TEH  
See ECN  
See ECN  
New data sheet  
*A  
Addition of VFBGA Package information and Pinout, Removal of SSOP  
Package. Edited text and moved figure titles to the top per new template  
*B  
470121  
TEH  
See ECN  
Change from preliminary to final data sheet. Grammatical and formatting  
changes  
*C  
*D  
*E  
*F  
*G  
476107  
491668  
498415  
567869  
TEH  
TEH  
TEH  
TEH  
See ECN  
See ECN  
See ECN  
See ECN  
10/13/08  
This data sheet needs to be posted to the web site under NDA  
Addition of Tri-state Mode  
Update power consumption numbers  
Remove NDA requirement  
2587010 KKU/PYRS  
Update Pin 6 description on Page 8  
Update template  
Sales, Solutions, and Legal Information  
Worldwide Sales and Design Support  
Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office  
closest to you, visit us at cypress.com/sales.  
Products  
PSoC  
PSoC Solutions  
General  
Clocks & Buffers  
Wireless  
Low Power/Low Voltage  
Precision Analog  
LCD Drive  
Memories  
Image Sensors  
CAN 2.0b  
USB  
© Cypress Semiconductor Corporation, 2004-2008. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of  
any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for  
medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as  
critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems  
application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.  
Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign),  
United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of,  
and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress  
integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without  
the express written permission of Cypress.  
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES  
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not  
assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where  
a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer  
assumes all risk of such use and in doing so indemnifies Cypress against all charges.  
Use may be limited by and subject to the applicable Cypress software license agreement.  
Document #: 38-08052 Rev. *G  
Revised October 5, 2008  
Page 15 of 15  
MoBL-USB TX2 is a trademark of Cypress Semiconductor Corporation. Intel is a registered trademark of Intel Corporation. All product and company names mentioned in  
this document are the trademarks of their respective holders.  
All products and company names mentioned in this document may be the trademarks of their respective holders.  
 

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