ADSST-21065LKCA-264 データシートの表示（PDF） - Analog Devices
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ADSST-21065LKCA-264 Datasheet PDF : 20 Pages
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SST-Melody-SHARC
The PEXT equation is calculated for each class of pins that can drive:
Table IV. External Power Calculations
Pin Type
No. of Pins
% Switching
؋C
؋f (MHz)
Address
11
50
10.7
30
MS0
1
0
10.7
–
SDWE
1
0
10.7
–
Data
32
50
7.7
30
SDRAM CLK
1
10.7
30
؋VDD2(V)
10.9
10.9
10.9
10.9
10.9
= PEXT (W)
0.019
0.000
0.000
0.042
0.007
PEXT = 0.068 W
A typical power consumption can now be calculated for these
conditions by adding a typical internal power dissipation (IDDIN,
see calculation in Electrical Characteristics section):
( ) PTOTAL = PEXT + IDDIN ×VDD
Note that the conditions causing a worst-case PEXT differ from
those causing a worst-case PINT. Maximum PINT cannot occur
while 100% of the output pins are switching from all ones (1s)
to all zeros (0s). Note also that it is not common for an applica-
tion to have 100% or even 50% of the outputs switching
simultaneously.
ENVIRONMENTAL CONDITIONS
Thermal Characteristics
The SST-Melody-SHARC is offered in a 208-lead MQFP and a
196-ball Mini-BGA package.
The SST-Melody-SHARC is specified for a case temperature
(TCASE). To ensure that TCASE is not exceeded, an air flow
source may be used.
( ) TCASE = TAMB + PD × θCA
TCASE = Case temperature (measured on top surface of package)
PD = Power Dissipation in W (this value depends upon the
specific application; a method for calculating PD is shown
under Power Dissipation)
JC = 7.1°C/W for 208-lead MQFP
JC = 5.1°C/W for 196-ball Mini-BGA
Airflow
Table V. Thermal Characteristics (208-Lead MQFP)
(Linear Ft/Min) 0 100 200 400 600
CA (°C/W)
24 20 19 17 13
Table VI. 196-Ball Mini-BGA
(Linear Ft/Min) 0 200 400
CA (°C/W)
38 29 23
–18–
REV. 0
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