89hpes12n3a Integrated Device Technology, 89hpes12n3a Datasheet - Page 15

• Manufacturer Part Number: 89hpes12n3a
• Description: 12-lane, 3-port Pcie I/o Expansion Switch
• Manufacturer: Integrated Device Technology

Thermal Considerations
is relevant to the thermal performance of the PES12N3A switch.
Heat Sink
in most cases.
IDT 89HPES12N3A Data Sheet
This section describes thermal considerations for the PES12N3A (19mm
Table 17 lists heat sink requirements for the PES12N3A under three common usage scenarios. As shown in this table, a heat sink is not required
Number of active
Lanes per Port
4/4/4
4/1/1
1 m/S or more
Air Flow
Note: The parameter
can vary with the number of board layers, size of the board, and airflow,
θ
θ
JA
Symbol
JA(effective)
Zero
Zero
T
T
given above are based on a 10-layer, standard height, full length (4.3”x12.2”) PCIe add-in card.
A(max)
J(max)
θ
θ
P
JB
JC
Watts
Watts
mA
mA
Effective Thermal Resistance, Junction-to-Ambient
4.3”x12.2” (standard height, full length form factor) or larger
1.0V
Core Supply
Typ
0.72
0.62
723
618
Thermal Resistance, Junction-to-Board
Thermal Resistance, Junction-to-Case
θ
JA(eff)
Power Dissipation of the Device
Table 17 Heat Sink Requirements Based on Air Flow and Board Characteristics
Table 16 Thermal Specifications for PES12N3A, 19x19 mm BCG324 Package
Junction Temperature
is not the absolute thermal resistance for the package as defined by JEDEC (JESD-51). Because resistance
Ambient Temperature
1.1V
Max
1.02
0.82
928
746
Parameter
Board Size
1.0V
PCIe Digital
Typ
0.58
578
398
0.4
Any
Any
Supply
Table 15 PES12N3A Power Consumption
1.1V
Max
0.76
693
458
0.5
15 of 31
1.0V
PCIe Analog
Typ
0.22
0.21
223
207
Supply
2
BCG324 package). The data in Table 16 below contains information that
Value
21.8
15.1
13.9
11.4
1.1V
125
Max
5.1
2.6
70
0.28
0.25
251
223
θ
JA(eff)
Board Layers
is the effective thermal resistance. The values for effective
1.5V
PCIe Termin-
Typ
4 or more
6 or more
0.44
0.21
ation Supply
291
142
Any
Units
Watts
o
o
o
o
o
C/W
C/W
C/W
C/W
C/W
o
o
C
C
1.575V
Max
0.54
0.25
345
160
Maximum for commercial-rated products
3.3V
0.004
0.003
Heat Sink Requirement
Typ
I/O Supply
1
1
Conditions
1 m/S air flow
2 m/S air flow
No heat sink required
No heat sink required
No heat sink required
Zero air flow
Maximum
Maximum
3.6V
Max
0.004
0.003
1
1
March 27, 2008
Power
1.96W
1.44W
Typ
Total
Power
Max
2.6W
1.8W