AGLP060 datasheet(20/128 Pages) ACTEL

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IGLOO PLUS DC and Switching Characteristics

2- 6

R ev isio n 1 1

Thermal Characteristics

Introduction

The temperature variable in the Actel Designer software refers to the junction temperature, not the

ambient temperature. This is an important distinction because dynamic and static power consumption

cause the chip junction temperature to be higher than the ambient temperature.

EQ 1 can be used to calculate junction temperature.

TJ = Junction Temperature = ΔT + TA

EQ 1

where:

TA = Ambient temperature

ΔT = Temperature gradient between junction (silicon) and ambient ΔT = θ

ja * P

ja = Junction-to-ambient of the package. θja numbers are located in Figure 2-5.

P = Power dissipation

Package Thermal Characteristics

The device junction-to-case thermal resistivity is

jc and the junction-to-ambient air thermal resistivity is

ja. The thermal characteristics for θja are shown for two air flow rates. The maximum operating junction

temperature is 100°C. EQ 2 shows a sample calculation of the maximum operating power dissipation

allowed for a 484-pin FBGA package at commercial temperature and in still air.

EQ 2

Temperature and Voltage Derating Factors

Maximum Power Allowed

Max. junction temp. (

°C) Max. ambient temp. (°C)

–

ja(°C/W)

------------------------------------------------------------------------------------------------------------------------------------------

100

°C70°C

–

20.5°C/W

-------------------------------------

1.46 W

Table 2-5 • Package Thermal Resistivities

Package Type

Count

Units

Still Air

200 ft./

min.

500 ft./

min.

Chip Scale Package (CSP)

201

TBD

C/W

281

TBD

C/W

289

TBD

C/W

Very Thin Quad Flat Package (VQFP)

128

TBD

C/W

176

TBD

C/W

Table 2-6 • Temperature and Voltage Derating Factors for Timing Delays (normalized to TJ = 70°C,

VCC =1.425 V)

For IGLOO PLUS V2 or V5 devices, 1.5 V DC Core Supply Voltage

Array Voltage

VCC (V)

Junction Temperature (°C)

–40°C

0°C

25°C

70°C

85°C

100°C

1.425

0.934

0.953

0.971

1.000

1.007

1.013

1.5

0.855

0.874

0.891

0.917

0.924

0.929

1.575

0.799

0.816

0.832

0.857

0.864

0.868

AGLP060 датащи(PDF) 20 Page - Actel Corporation

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