TS68020 ATMEL Corporation, TS68020 Datasheet - Page 8

• Manufacturer Part Number: TS68020
• Description: Hcmos 32-bit Virtual Memory Mpu, 16/20/25 MHZ
• Manufacturer: ATMEL Corporation

Table 4. Thermal Characteristics at 25°C
Power Considerations
8
Package
PGA 114
CQFP 132
TS68020
Symbol
θ
θ
θ
θ
JA
JC
JA
JC
Parameter
Thermal Resistance - Ceramic Junction to Ambient
Thermal Resistance - Ceramic Junction to Case
Thermal Resistance - Ceramic Junction to Ambient
Thermal Resistance - Ceramic Junction to Case
This device contains protective circuitry against damage due to high static voltages or
electrical fields; however, it is advised that normal precautions be taken to avoid applica-
tion of any voltages higher than maximum-rated voltages to this high-impedance circuit.
Reliability of operation is enhanced if unused inputs are tied to an appropriate logic volt-
age level (e.g., either GND or V
Figure 5. Clock Input Timing Diagram
Note:
The average chip-junction temperature, T
T
θ
P
P
P
For most applications P
An approximate relationship between P
Solving equations (1) and (2) for K gives:
where K is a constant pertaining to the particular part K can be determined from equa-
tion (3) by measuring P
values of P
value of T
A
JA
D
INT
I/O
T
P
K = P
= Ambient Temperature, °C
= P
J
D
= Package Thermal Resistance, Junction-to-Ambient,
= Power Dissipation on Input and Output Pins — User Determined
= T
= I
= K + (T
INT
CC
D
A
Timing measurements are referenced to and from a low voltage of 0.8V and a high volt-
age of 2.0V, unless otherwise noted. The voltage swing through this range should start
outside and pass through the range such that the rise or fall will be linear between 0.8V
and 2.0V.
+ (P
· (T
A
+ P
· V
.
D
A
CC
and T
I/O
J
D
+ 273) + θ
+ 273)
, Watts — Chip Internal Power
· θ
JA
J
)
can be obtained by solving equations (1) and (2) iterativley for any
I/O
JA
D
< P
· P
(at equilibrium) for a known T
D
INT
2
CC
and can be neglected.
).
D
and T
J,
in °C can be obtained from:
J
(if P
I/O
is neglected) is:
(1)
(2)
(3)
°
A
C/W
. Using this value of K, the
Value
26
34
5
2
2115A–HIREL–07/02
°
°
°
°
Unit
C/W
C/W
C/W
C/W