TS68C429AMR datasheet(9/43 Pages) ATMEL

Numer części	TS68C429AMR

Szczegółowy opis	CMOS ARINC 429 Multichannel Receiver/ Transmitter MRT

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9

TS68C429A

2120A–HIREL–08/02

Power Considerations

The average chip-junction temperature, T

J, in °C can be obtained from:

T

J = TA + (PD ⋅ θJA)(1)

T

A = Ambient Temperature, °C

θ

JA = Package Thermal Resistance, Junction-to-Ambient, °C/W

P

D = PINT + PI/O

P

INT = ICC x VCC, Watts—Chip Internal Power

P

I/O = Power Dissipation on Input and Output Pins—User Determined

For most applications P

I/O < PINT and can be neglected.

An approximate relationship between P

D and TJ (if PI/O is neglected) is:

P

D = K: (TJ + 273)

(2)

Solving equations (1) and (2) for K gives:

K = P

D ⋅ (TA + 273) + θJA ⋅ PD

2

(3)

where K is a constant pertaining to the particular part K can be determined from equa-

tion (3) by measuring P

D (at equilibrium) for a known TA. Using this value of K, the

values of P

D and TJ can be obtained by solving equations (1) and (2) iteratively for any

value of T

A.

The total thermal resistance of a package (

θ

JA) can be separated into two components,

θ

JC and θCA, representing the barrier to heat flow from the semiconductor junction to the

package (case), surface (

θ

JC) and from the case to the outside ambient (θCA). These

terms are related by the equation:

θ

JA = θJC + θCA

(4)

θ

JC is device related and cannot be influenced by the user. However, θCA is user depen-

dent and can be minimized by such thermal management techniques as heat sinks,

ambient air cooling and thermal convection. Thus, good thermal management on the

part of the user can significantly reduce

θ

CA so that θJA approximately equals θJC. Substi-

tution of

θ

JC for θJA in equation (1) will result in a lower semiconductor junction

temperature.

Mechanical and

Environment

The microcircuits shall meet all mechanical environmental requirements of either MIL-

STD-883 for class B devices or DESC devices.

Marking

The document where are defined the marking are identified in the related reference doc-

uments. Each microcircuit are legibly and permanently marked with the following

information as minimum:

•Atmel logo

•

Manufacturer’s part number

•

Class B identification

•

Date-code of inspection lot

•

ESD identifier if available

•

Country of manufacturing

Podobny numer części - TS68C429AMR

Producent	Numer części	Arkusz danych	Szczegółowy opis
List of Unclassifed Man...	TS68C429AMRBCA	1Mb / 46P	CMOS ARINC 429 Multichannel Receiver/Transmitter (MRT)

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Podobny opis - TS68C429AMR

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	HI-8282	187Kb / 13P	ARINC 429 SERIAL TRANSMITTER AND DUAL RECEIVER
	HI-8282A	214Kb / 14P	ARINC 429 SERIAL TRANSMITTER AND DUAL RECEIVER
	HI-3282	122Kb / 14P	ARINC 429 Serial Transmitter and Dual Receiver
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	HI-8282	448Kb / 14P	ARINC 429 SERIAL TRANSMITTER AND DUAL RECEIVER
	HI-8584	294Kb / 14P	Enhanced ARINC 429 Serial Transmitter and Dual Receiver

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