參數(shù)資料
型號(hào)： CY7C68301C
廠商： Cypress Semiconductor Corp.
英文描述： EZ-USB AT2LP USB 2.0 to ATA/ATAPI Bridge(EZ-USB AT2LP USB 2.0到ATA/ATAPI橋接器)
中文描述： 的EZ - USB AT2LP產(chǎn)品的USB 2.0的ATA / ATAPI橋（的EZ - USB AT2LP產(chǎn)品的USB 2.0到ATA / ATAPI接口橋接器）
文件頁(yè)數(shù)： 40/42頁(yè)
文件大?。?/td> 761K
代理商： CY7C68301C
CY7C68300C/CY7C68301C
CY7C68320C/CY7C68321C
Document 001-05809 Rev. *A
Page 40 of 42
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 must be
designed into the PCB as a thermal pad under the package.
Heat is transferred from the AT2LP through the device’s metal
paddle on the bottom side of the package. Heat from here is
conducted to the PCB at the thermal pad. It is then conducted
from the thermal pad to the PCB inner ground plane by a 5 x
5 array of vias. 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 side over each via to resist solder flow into
the via. The mask on the top side also minimizes outgassing
during the solder reflow process.
For further information on this package design, refer to the
application note
Surface Mount Assembly of AMKOR’s
MicroLeadFrame (MLF) Technology
. The application note
provides detailed information on board mounting guidelines,
soldering flow, rework process, etc.
Figure 15
displays a cross-sectional area underneath the
package. The cross section is of only one via. The solder paste
template needs to be designed to allow at least 50% solder
coverage. The thickness of the solder paste template must be
5 mil. It is recommended that ’No Clean,’ type 3 solder paste
is used for mounting the part. Nitrogen purge is recommended
during reflow.
Figure 15. Cross-Section of the Area Under the QFN Package
Figure 16
is a plot of solder mask pattern and
Figure 17
displays an X-Ray image of assembly (darker areas indicate solder).
Figure 16. Plot of the Solder Mask (White Area)
Figure 17. X-Ray Image of the Assembly
Other Design Considerations
Certain design considerations must be followed to ensure
proper operation of the CY7C68300C/CY7C68301C. The
following items must be taken into account when designing a
USB device with the CY7C68300C/CY7C68301C.
Proper Power Up Sequence
Power must be applied to the CY7C68300C/CY7C68301C
before, or at the same time as the ATA/ATAPI device. If power
is supplied to the drive first, the CY7C68300C/CY7C68301C
startup in an undefined state. Designs that utilize separate
power supplies for the CY7C68300C/CY7C68301C and the
ATA/ATAPI device are not recommended.
0.017” dia
Solder Mask
Cu Fill
Cu Fill
PCB Material
PCB Material
0.013” dia
Via hole for thermally connecting the
QFN to the circuit board ground plane.
This figure only shows the top three layers of the
circuit board: Top Solder, PCB Dielectric, and
the Ground Plane
相關(guān)PDF資料
PDF描述
CY7C68300C EZ-USB AT2LP USB 2.0 to ATA/ATAPI Bridge(EZ-USB AT2LP USB 2.0到ATA/ATAPI橋接器)
CY7C68321C EZ-USB AT2LP USB 2.0 to ATA/ATAPI Bridge(EZ-USB AT2LP USB 2.0到ATA/ATAPI橋接器)
CY8C20434 PSoC Mixed-Signal Array(PSoC混合信號(hào)陣列)
CY8C20234 PSoC Mixed-Signal Array(PSoC混合信號(hào)陣列)
CY8C20334 PSoC Mixed-Signal Array(PSoC混合信號(hào)陣列)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY7C68301C-56LFXC 功能描述:USB 接口集成電路 USB Hi Spd Peripherals RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C68301C-56LTXC 功能描述:USB 接口集成電路 AT2LP HS-USB RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C68301C-56PVXC 功能描述:USB 接口集成電路 USB Hi Spd Peripherals RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C68310-80AC 制造商:Cypress Semiconductor 功能描述:
CY7C68310-80AXC 制造商:Rochester Electronics LLC 功能描述: 制造商:Cypress Semiconductor 功能描述:
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