Peripheral operating requirements and behaviors
1.
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.
2.
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.
3.
4.
5.
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.
6.
Determined according to JEDEC Standard JESD51-2, Integrated Circuits Thermal Test Method Environmental
Conditions—Natural Convection (Still Air).
8 Peripheral operating requirements and behaviors
8.1 Core modules
8.1.1 JTAG Timing
Table 15. JTAG Timing
Characteristic
Symbol
Min
Max
Unit
See
Figure
TCK frequency of operation
TCK clock pulse width
fOP
tPW
tDS
tDH
tDV
tTS
DC
50
5
SYS_CLK/8
MHz
ns
Figure 5
Figure 5
Figure 6
Figure 6
Figure 6
Figure 6
—
—
—
30
30
TMS, TDI data set-up time
TMS, TDI data hold time
TCK low to TDO data valid
TCK low to TDO tri-state
ns
5
ns
—
—
ns
ns
1/f
OP
t
t
PW
PW
V
IH
V
V
V
M
M
TCK
(Input)
IL
V
= V + (V – V )/2
IL IH IL
M
Figure 5. Test Clock Input Timing Diagram
MC56F844xx Advance Information Data Sheet, Rev. 2, 06/2012.
34
Freescale Semiconductor, Inc.
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