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TS68020DESC03XA View Datasheet(PDF) - Atmel Corporation

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Description
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TS68020DESC03XA
Atmel
Atmel Corporation Atmel
TS68020DESC03XA Datasheet PDF : 45 Pages
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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 VCC).
Figure 5. Clock Input Timing Diagram
Note:
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.
Table 4. Thermal Characteristics at 25°C
Package
Symbol Parameter
PGA 114
CQFP 132
θJA
Thermal Resistance - Ceramic Junction to Ambient
θJC
Thermal Resistance - Ceramic Junction to Case
θJA
Thermal Resistance - Ceramic Junction to Ambient
θJC
Thermal Resistance - Ceramic Junction to Case
Value
26
5
34
2
Unit
°C/W
°C/W
°C/W
°C/W
Power Considerations
The average chip-junction temperature, TJ, in °C can be obtained from:
TJ = TA + (PD · θ JA)
(1)
TA = Ambient Temperature, °C
θJA = Package Thermal Resistance, Junction-to-Ambient, °C/W
PD = PINT + PI/O
PINT = ICC · VCC, Watts — Chip Internal Power
PI/O = Power Dissipation on Input and Output Pins — User Determined
For most applications PI/O < PINT and can be neglected.
An approximate relationship between PD and TJ (if PI/O is neglected) is:
PD = K + (TJ + 273)
(2)
Solving equations (1) and (2) for K gives:
K = PD · (TA + 273) + θJA · PD2
(3)
where K is a constant pertaining to the particular part K can be determined from equa-
tion (3) by measuring PD (at equilibrium) for a known TA. Using this value of K, the
values of PD and TJ can be obtained by solving equations (1) and (2) iterativley for any
value of TA.
8 TS68020
2115A–HIREL–07/02
 

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