
Document Number: 001-53754 Rev. *F Page 35 of 50
Packaging Information
This section illustrates the package specification for the CY8C24x94 PSoC devices, along with the thermal impedance for the package
and solder reflow peak temperatures.
Note Emulation tools may require a larger area on the target PCB than the chip's footprint. For a detailed description of the emulation
tools' dimensions, refer to the emulator pod drawings at http://www.cypress.com.
Figure 9. 56-Pin (8 × 8 mm) QFN (Punched)
Important Note
■ For information on the preferred dimensions for mounting QFN packages, see the following application note, Application Notes for
Surface Mount Assembly of Amkor's MicroLeadFrame (MLF) Packages available at http://www.amkor.com.
■ Pinned vias for thermal conduction are not required for the low power PSoC device.
Thermal Impedances Solder Reflow Specifications
Tabl e 2 9 shows the solder reflow temperature limits that must not
be exceeded.
Table 28. Thermal Impedance per Package
Package Typical
JA
[22]
Typical
JC
56-pin QFN
[23]
19 C/W 1.7 C/W
Table 29. Solder Reflow Specifications
Package
Maximum Peak
Temperature (T
C
)
Maximum Time
above T
C
– 5 °C
56-pin QFN 260 C 30 seconds
Notes
22. T
J
= T
A
+ Power ×
JA.
23. To achieve the thermal impedance specified for the QFN package, refer to the application notes for Surface Mount Assembly of Amkor's MicroLeadFrame (MLF)
Packages available at http://www.amkor.com.
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