DS21448 データシートの表示（PDF） - Maxim Integrated

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DS21448

3.3V E1/T1/J1 Quad Line Interface

Maxim Integrated 

13. THERMAL INFORMATION

DS21448 3.3V T1/E1/J1 Quad Line Interface

Table 13-A. Thermal Characteristics—BGA

PARAMETER

MIN

TYP

Ambient Temperature (Note 1)

-40

Junction Temperature

Theta-JA (θJA) in Still Air (Note 2)

+24

MAX

+85

+125

UNITS

°C

°C

°C/W

Table 13-B. Theta-JA (θJA) vs. Airflow—BGA

FORCED AIR (m/s)

0

1

2.5

THETA-JA (θJA)

24°C/W

21°C/W

19°C/W

Table 13-C. Thermal Characteristics—LQFP

PARAMETER

MIN

TYP

Ambient Temperature (Note 1)

-40

Junction Temperature

Theta-JA (θJA) in Still Air (Note 2)

+27.8

Theta-JC (θJC) in Still Air (Note 3)

+0.1

MAX

+85

+125

UNITS

°C

°C

°C/W

°C/W

Table 13-D. Theta-JA (θJA) vs. Airflow—LQFP

FORCED AIR (m/s)

0

1

2.5

THETA-JA (θJA)

27.8°C/W

23.5°C/W

21.6°C/W

Note 1: The package is mounted on a four-layer JEDEC-standard test board.

Note 2: Theta-JA (θJA) is the junction-to-ambient thermal resistance, when the package is mounted on a four-layer JEDEC-standard test board.

Note 3: While Theta-JC (θJC) is commonly used as the thermal parameter that provides a correlation between the junction temperature (Tj) and

the average temperature on top center of the LQFP package (TC), the proper term is Psi-JT. It is defined by: (Tj - TC) / overall package

power.

Note 4: The method of measurement for the thermal parameters is defined in the EIA/JEDEC-standard document EIA-JESD51-2.

14. REVISION HISTORY

REVISION

042303 New product release.

DESCRIPTION

012104

Table 5-B. Receive Level Indication: Changed “-12.5 to -5.0” to “-12.5 to -15.0”. Adjusted steps

after -17.5 dB to be in -2.5dB decrements.

Section 9, Operating Parameters: Updated supply current and power dissipation values in the DC

Characteristics table to reflect latest characterization data. Updated Note 5 to show that values are for all ports

active.

113004

In the Absolute Maximum Ratings section, added range for storage temperature and changed

soldering temperature from IPC JEDEC J-STD-020A to J-STD-020.

011206 Added lead-free packages to Ordering Information table.

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No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.

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