Peripheral operating requirements and behaviors
Board type
Symbol
Description
64 MAPBGA 64 LQFP
Unit
Notes
Single-layer
(1s)
RθJMA
Thermal
resistance,
junction to
ambient (200 ft./
min. air speed)
90
51
31
53
40
28
°C/W
1,3
Four-layer
(2s2p)
RθJMA
Thermal
resistance,
junction to
ambient (200 ft./
min. air speed)
°C/W
°C/W
,
—
RθJB
Thermal
resistance,
junction to
board
5
—
—
RθJC
Thermal
resistance,
junction to case
31
6
15
3
°C/W
°C/W
6
7
ΨJT
Thermal
characterization
parameter,
junction to
package top
outside center
(natural
convection)
1.
2.
Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site
(board) temperature, ambient temperature, air flow, power dissipation of other components on the board, and board
thermal resistance.
Determined according to JEDEC Standard JESD51-2, Integrated Circuits Thermal Test Method Environmental
Conditions—Natural Convection (Still Air) with the single layer board horizontal. For the LQFP, the board meets the
JESD51-3 specification. For the MAPBGA, the board meets the JESD51-9 specification.
Determined according to JEDEC Standard JESD51-6, Integrated Circuits Thermal Test Method Environmental
Conditions—Forced Convection (Moving Air) with the board horizontal.
Determined according to JEDEC Standard JESD51-8, Integrated Circuit Thermal Test Method Environmental
Conditions—Junction-to-Board. Board temperature is measured on the top surface of the board near the package.
Determined according to Method 1012.1 of MIL-STD 883, Test Method Standard, Microcircuits, with the cold plate
temperature used for the case temperature. The value includes the thermal resistance of the interface material
between the top of the package and the cold plate.
3.
5.
6.
7.
Determined according to JEDEC Standard JESD51-2, Integrated Circuits Thermal Test Method Environmental
Conditions—Natural Convection (Still Air).
6 Peripheral operating requirements and behaviors
6.1 Core modules
K20 Sub-Family Data Sheet, Rev. 4 5/2012.
22
Freescale Semiconductor, Inc.
FREESCALE [ Freescale ]
