80960HA Datasheet, PDF (29/102 Pages) Intel Corporation – 80960HA/HD/HT 32-Bit High-Performance Superscalar Processor

80960HA/HD/HT
3.3
Package Thermal Specifications
The 80960Hx is specified for operation when T_C (case temperature) is within the range of
0°C–85°C. T_C may be measured in any environment to determine whether the 80960Hx is within
the specified operating range. Measure the case temperature at the center of the top surface,
opposite the pins. Refer to Figure 5.
T_A (ambient temperature) is calculated from θ_CA (thermal resistance from case to ambient) using
the equation:
T_A = T_C – P*θ_CA
Table 12 shows the maximum T_A allowable (without exceeding T_C) at various airflows and
operating frequencies (f_CLKIN).
Note that T_A is greatly improved by attaching fins or a heatsink to the package. P (maximum power
consumption) is calculated by using the typical I_CC as tabulated in Section 4.6, “DC
Specifications” on page 32 and V_CC of 3.3 V.
Figure 5. Measuring 80960Hx PGA Case Temperature
Measure PGA/PQ4 temperature at
center of top surface
Advance Information Datasheet
23