ORT82G5-1BM680C LATTICE [Lattice Semiconductor], ORT82G5-1BM680C Datasheet - Page 114

• Manufacturer Part Number: ORT82G5-1BM680C
• Description: 0.6 to 3.7 Gbps XAUI and FC FPSCs
• Manufacturer: LATTICE [Lattice Semiconductor]

Table 45. ORT82G5 680-Pin PBGAM (fpBGA) Pinout (Continued)
Lattice Semiconductor
Package Thermal Characteristics Summary
There are three thermal parameters that are in common use: Θ
parameters are affected, to varying degrees, by package design (including paddle size) and choice of materials,
the amount of copper in the test board or system board, and system airflow.
Θ
This is the thermal resistance from junction to ambient (theta-JA, R-theta, etc.):
where T
Experimentally, Θ
the part is mounted on the thermal test board. The diodes on the test chip are separately calibrated in an oven. The
package/board is placed either in a JEDEC natural convection box or in the wind tunnel, the latter for forced con-
vection measurements. A controlled amount of power (Q) is dissipated in the test chip’s heater resistor, the chip’s
temperature (T
that Θ
ψ
This JEDEC designated parameter correlates the junction temperature to the case temperature. It is generally
used to infer the junction temperature while the device is operating in the system. It is not considered a true thermal
resistance and it is defined by:
680-PBGAM V
JC
JA
W13
W14
W15
W20
W21
W22
W32
U21
U22
V13
V14
V15
V20
V21
V22
Y16
Y17
Y18
Y19
T32
JA
J
is expressed in units of °C/W.
is the junction temperature, T
DD
J
) is determined by the forward drop on the diodes, and the ambient temperature (T
IO Bank VREF Group
JA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
is determined when a special thermal test die is assembled into the package of interest, and
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
A ,
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
is the ambient air temperature, and Q is the chip power.
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
NC
NC
I/O
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
Θ
ψ
JC
JA
=
=
Pin Description
114
T
T
J
J
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ORCA ORT42G5 and ORT82G5 Data Sheet
– T
– T
Q
Q
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
NC
NC
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
A
C
JA
,
ψ
JC
, and Θ
Additional Function
JC
. It should be noted that all the
—
—
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—
—
—
—
—
—
—
—
—
—
—
—
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—
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A
) is noted. Note
680-PBGAM
—
—
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—
—
—
—
—
—
—
—
—
—
—
—
—
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—
—
—
(1)
(2)