80960KB datasheet(35/44 Pages) INTEL

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80960KB

3.3

Package Thermal Specification

The 80960KB 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 temper-

ature can be calculated from:

•

TJ = TC + P*θjc

•

TA = TJ + P*θja

•

TC = TA + P*[θja−θjc]

Values for θja and θjc for various airflows are given in

Table 12 for the PGA package and in Table 12 for

the PQFP package. The PGA’s θja 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 (TA)

permitted without exceeding TC is shown by the

graphs in Figures 23, 24, 25 and 26. The curves

assume the maximum permitted supply current (ICC)

at each speed, VCC of +5.0 V and a TCASE of +85°C

(PGA) or +100°C (PQFP).

If the 80960KB is to be used in a harsh environment

where the ambient temperature may exceed the

limits for the normal commercial part, consider using

extended

temperature

device.

These

components 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

TA80960KB at various airflows. The curve assumes

an ICC of 420 mA, VCC of 5.0 V and a TCASE of

+125°C.

Table 14. 80960KB PGA Package Thermal Characteristics

Thermal Resistance — °C/Watt

Parameter

Airflow — ft./min (m/sec)

(0)

(0.25)

100

(0.50)

200

(1.01)

400

(2.03)

600

(3.04)

800

(4.06)

θ Junction-to-Case

θ Case-to-Ambient

(No Heatsink)

θ Case-to-Ambient

(Omnidirectional

Heatsink)

θ Case-to-Ambient

(Unidirectional Heat-

sink)

NOTES:

1. This table applies to 80960KB PGA plugged into socket or soldered directly to board.

2. θJA = θJC + θCA

3. θJ-CAP = 4°C/W (approx.)

θJ-PIN = 4°C/W (inner pins) (approx.)

θJ-PIN = 8°C/W (outer pins) (approx.)

θJC

θJA

θJ-PIN

θJ-CAP

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