參數(shù)資料
型號(hào)： A54SX08A1FG144M
英文描述： Logic IC
中文描述： 邏輯IC
文件頁(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 833K
代理商： A54SX08A1FG144M
v2.0
13
54SX Family FPGAs RadTolerant and HiRel
Power Dissipation
P = [I
CC
standby + I
CC
active] * V
CCA
+ I
OL
* V
OL
* N +
I
OH
*(V
CCA
–
V
OH
) * M
where:
I
CC
standby is the current flowing when no inputs or
outputs are changing.
I
CC
active is the current flowing due to CMOS switching.
I
OL
, I
OH
are TTL sink/source currents.
V
OL
, V
OH
are TTL level output voltages.
N equals the number of outputs driving TTL loads to V
OL
.
M equals the number of outputs driving TTL loads to V
OH
.
Accurate values for N and M are difficult to determine
because they depend on the design and on the system I/O.
The power can be divided into two components: static and
active.
Static Power Component
The power due to standby current is typically a small
component of the overall power. Standby power is shown
below for military, worst case conditions (70
°
C).
I
CC
V
CC
20 mA
3.6V
Active Power Component
Power dissipation in CMOS devices is usually dominated by
the active (dynamic) power dissipation. This component is
frequency-dependent, a function of the logic and the
external I/O. Active power dissipation results from charging
internal
chip
capacitances
unprogrammed antifuses, module inputs, and module
outputs, plus external capacitance due to PC board traces
of
the
interconnect,
and load device inputs. An additional component of the
active power dissipation is the totempole current in CMOS
transistor pairs. The net effect can be associated with an
equivalent capacitance that can be combined with
frequency and voltage to represent active power dissipation.
Equivalent Capacitance
The power dissipated by a CMOS circuit can be expressed by
Equation 1:
Power (μW) = C
EQ
* V
CCA2
* F
where:
C
EQ
= Equivalent capacitance in pF
V
CCA
= Power supply in volts (V)
F
= Switching frequency in MHz
(1)
Equivalent capacitance is calculated by measuring
I
CC
active at a specified frequency and voltage for each
circuit component of interest. Measurements have been
made over a range of frequencies at a fixed value of V
CCA
.
Equivalent capacitance is frequency-independent so that
the results may be used over a wide range of operating
conditions. Equivalent capacitance values are shown below.
C
EQ
Values (pF)
To calculate the active power dissipated from the complete
design, the switching frequency of each part of the logic
must be known. Equation 2 shows a piece-wise linear
summation over all components.
Power =V
CCA2
* [(m * C
EQM
* f
m
)
modules
+
(n * C
EQI
* f
n
)
inputs
+ (p * (C
EQO
+ C
L
) * f
p
)
outputs
+
0.5 * (q
1
* C
EQCR
* f
q1
)
routed_Clk1
+ (r
1
* f
q1
)
routed_Clk1
+
0.5 * (q
2
* C
EQCR
* f
q2
)
routed_Clk2
+ (r
2
* f
q2
)
routed_Clk2
+
0.5 * (s
1
* C
EQCD
* f
s1
)
dedicated_CLK
]
(2)
Power
72 mW
RT54SX16
A54SX16
RT54SX32
A54SX32
Equivalent Capacitance (pF)
Modules
C
EQM
C
EQI
C
EQO
C
EQCR
C
EQCD
7.0
3.9
7.0
3.9
Input Buffers
2.0
1.0
2.0
1.0
Output Buffers
10.0
5.0
10.0
5.0
Routed Array Clock Buffer Loads
0.4
0.2
0.6
0.3
Dedicated Clock Buffer Loads
0.25
0.15
0.34
0.23
Fixed Capacitance (pF)
routed_Clk1
r
1
r
2
120
60
210
107
routed_Clk2
120
60
210
107
Fixed Clock Loads
Clock Loads on Dedicated Array Clock
s
1
528
528
1,080
1,080
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