80960JD
A
TJ = TC + P (qJC
)
3.2
Package Thermal Specifications
Similarly, if TA is known, the corresponding case
temperature (TC) can be calculated as follows:
The 80960JD is specified for operation when TC
(case temperature) is within the range of 0°C to 85°C
for the (PGA) 80960JD-50, or 0°C to 100°C for the
(PQFP and PGA) 80960JD-40 and 80960JD-33.
Case temperature may be measured in any
environment to determine whether the 80960JD is
within specified operating range. The case temper-
ature should be measured at the center of the top
surface, opposite the pins.
TC = TA + P (qCA
)
Compute P by multiplying ICC from Table 14 and
VCC. Values for qJC and qCA are given in Table 10 for
the PGA package and Table 11 for the PQFP
package. For high speed operation, the processor’s
qJA may be significantly reduced by adding
a
heatsink and/or by increasing airflow.
qCA is the thermal resistance from case to ambient.
Figure 6 shows the maximum ambient temperature
(TA) permitted without exceeding TC for the
80960JD-50 in a PGA package. Figure 7 illustrates
this for the 80960JD-40 in PGA and PQFP
packages. The curves are based on minimum ICC
(hot) and maximum VCC of +5.25 V, with a TCASE of
+85°C for the 80960JD-50, or a TCASE of +100°C for
the 80960JD-40.
Use the following equation to calculate TA, the
maximum ambient temperature to conform to
particular case temperature:
a
TA = TC - P (qCA
)
Junction temperature (TJ) is commonly used in
reliability calculations. TJ can be calculated from qJC
(thermal resistance from junction to case) using the
following equation:
Table 10. 132-Lead PGA Package Thermal Characteristics
Thermal Resistance — °C/Watt
Airflow — ft./min (m/sec)
200 400 600 800
(1.01) (2.03) (3.04) (4.06) (5.08)
Parameter
0
1000
(0)
qJC (Junction-to-Case)
3
3
3
12
9
3
11
8
3
11
8
3
11
8
qCA (Case-to-Ambient) (No Heatsink)
18
15
14
15
12
11
qCA (Case-to-Ambient) (Omnidirectional Heatsink)
qCA (Case-to-Ambient) (Unidirectional Heatsink)
8
7
7
7
qJA
qCA
qJC
qJ-PIN
qJ-CAP
NOTES:
1. This table applies to a PGA device plugged into a socket or soldered directly into a board.
2.
3.
4.
5.
q
q
q
q
= q + q
JA
JC
CA
= 4°C/W (approx.)
J-CAP
J-PIN
J-PIN
= 4°C/W (inner pins) (approx.)
= 8°C/W (outer pins) (approx.)
20
PRELIMINARY
INTEL [ INTEL ]
