80960KA Datasheet, PDF (32/43 Pages) Intel Corporation – EMBEDDED 32-BIT MICROPROCESSOR

80960KA
3.3. Package Thermal Specification
The 80960KA is specified for operation when case
temperature is within the range 0°C to 85°C (PGA) or
0°C to 100°C (PQFP). Measure case temperature at
the top center of the package. Ambient temperature
can be calculated from:
T_J = T_C + P*θ_jc
T_A = T_J + P*θ_ja
T_C = T_A + P*[θ_ja−θ_jc]
Values for θ_ja and θ_jc for various airflows are given in
Table 13 for the PGA package and in Table 14 for the
PQFP package. The PGA’s θ_ja can be reduced by
adding a heatsink. For the PQFP, however, a heatsink
is not generally used since the device is intended to
be surface mounted.
Maximum allowable ambient temperature (T_A)
permitted without exceeding T_C is shown by the
graphs in Figures 23, 24, 25 and 26. The curves
assume the maximum permitted supply current (I_CC)
at each speed, V_CC of +5.0 V and a T_CASE of +85°C
(PGA) or +100°C (PQFP).
If the 80960KA is to be used in a harsh environment
where the ambient temperature may exceed the limits
for the normal commercial part, consider using an
extended temperature device. These components are
designated by the prefix “TA” and are available at 16,
20 and 25 MHz in the ceramic PGA package.
Extended operating temperature range is –40° C to
+125°C (case).
Figure 26 shows the maximum allowable ambient
temperature for the 20 MHz extended temperature
TA80960KA at various airflows. The curve assumes
an I_CC of 420 mA, V_CC of 5.0 V and a T_CASE of
+125°C.
Table 13. 80960KA PGA Package Thermal Characteristics
Thermal Resistance — °C/Watt
Parameter
Airflow — ft./min (m/sec)
0
50
100
200
400
600
800
(0) (0.25) (0.50) (1.01) (2.03) (3.04) (4.06)
θ Junction-to-Case
2
2
2
2
2
2
2
θ Case-to-Ambient
(No Heatsink)
19
18
17
15
12
10
9
θ Case-to-Ambient
(Omnidirectional
16
15
14
12
9
7
6
Heatsink)
θ Case-to-Ambient
(Unidirectional
15
14
13
Heatsink)
NOTES:
1. This table applies to 80960KA PGA plugged into
socket or soldered directly to board.
2. θ_JA = θ_JC + θ_CA
11
8
6
5
3. θ_J-CAP = 4°C/W (approx.)
θ_J-PIN = 4°C/W (inner pins) (approx.)
θ_J-PIN = 8°C/W (outer pins) (approx.)
θ_JA
θ_J-PIN
θ_JC
θ_J-CAP
29