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參數(shù)資料
| 型號(hào)： | AM486 |
| 英文描述： | Am486 Microprocessor Software User＇s Manual? 4.40MB (PDF) |
| 中文描述： | Am486微處理器軟件用戶手冊(cè)？ 4.40MB（PDF格式） |
| 文件頁數(shù)： | 48/52頁 |
| 文件大小： | 1242K |
| 代理商： | AM486 |
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48
Am486DE2 Microprocessor
PACKAGE THERMAL SPECIFICATIONS
The Am486 microprocessor is specified for operation
when T
CASE
(the case temperature) is within the range
of 0
°
C to +85
°
C. T
CASE
can be measured in any environ-
ment to determine whether the Am486DE2 micropro-
cessor is within the specified operating range. The case
temperature should be measured at the center of the
top surface opposite the pins.
The ambient temperature (T
A
) is guaranteed as long as
T
CASE
is not violated. The ambient temperature can be
calculated from
θ
JC
and
θ
JA
and from the following equa-
tions:
T
J
= T
CASE
+ P
θ
JC
T
A
= T
J
– P
θ
JA
T
CASE
= T
A
+ P
[
θ
JA
–
θ
JC
]
where:
T
J
, T
A
, T
CASE
= Junction, Ambient, and Case Tempera-
ture.
θ
JC
,
θ
JA
= Junction-to-Case and Junction-to-Ambient
Thermal Resistance, respectively
P = Maximum Power Consumption
The values for
θ
JA
and
θ
JC
are given in Table 15 for the
1.75 sq. in., 168-pin, ceramic PGA. For the 208-lead
SQFP plastic package,
θ
JA
= 14.0 and
θ
JC
= 1.5.
Table 16 shows the T
A
allowable (without exceeding
T
CASE
) at various airflows and operating frequencies
(Clock). Note that T
A
is greatly improved by attaching
fins or a heat sink to the package. Heat sink dimensions
are shown in Figure 47. P (the maximum power con-
sumption) is calculated by using the maximum I
CC
at
3.3 V as tabulated in the DC Characteristics
Figure 25. Test Signal Timing Diagram
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