89hpes64h16 Integrated Device Technology, 89hpes64h16 Datasheet - Page 20
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89hpes64h16
Manufacturer Part Number
89hpes64h16
Description
64-lane, 16-port Pcie System Interconnect Switch
Manufacturer
Integrated Device Technology
Datasheet
1.89HPES64H16.pdf
(49 pages)
Thermal Considerations
that is relevant to the thermal performance of the PES64H16 switch.
IDT 89HPES64H16 Data Sheet
This section describes thermal considerations for the PES64H16 (35mm
Note: It is important for the reliability of this device in any user environment that the junction temperature not exceed the T
specified in Table 16. Consequently, the effective junction to ambient thermal resistance (
maintained below the value determined by the formula:
Given that the values of T
achieve the desired
provided in Table 16), thermal resistance of the chosen adhesive (
circuit board (number of layers and size of the board). As a general guideline, this device will not need a heat sink if the board has 10 or
more layers AND the board size is larger than 4"x12" AND airflow in excess of 1 m/s is available. It is strongly recommended that users
perform their own thermal analysis for their own board and system design scenarios.
θ
Symbol
JA(effective)
T
T
A(max)
J(max)
θ
θ
P
JB
JC
θ
JA
= (T
J(max)
Effective Thermal Resistance, Junction-to-Ambient
θ
- T
JA
Thermal Resistance, Junction-to-Board
Thermal Resistance, Junction-to-Case
A(max)
is left up to the board or system designer, but in general, it can be achieved by adding the effects of
J(max)
Power Dissipation of the Device
Table 16 Thermal Specifications for PES64H16, 35x35mm FCBGA1156 Package
)/P
Junction Temperature
Ambient Temperature
, T
Parameter
A(max)
, and P are known, the value of desired
20 of 49
2
θ
FCBGA1156 package). The data in Table 16 below contains information
CS
Value
12.57
12.6
125
), that of the heat sink (
6.4
5.4
2.1
0.1
70
θ
JA
Units
becomes a known entity to the system designer. How to
Watts
o
o
o
o
o
C/W
C/W
C/W
C/W
C/W
o
o
C
C
θ
JA
) for the worst case scenario must be
θ
SA
), amount of airflow, and properties of the
Conditions
1 m/S air flow
2 m/S air flow
Zero air flow
Maximum
Maximum
Maximum
April 16, 2008
J(max)
θ
JC
(value
value