參數(shù)資料
型號: SN74ALVC7803-40DLR
廠商: TEXAS INSTRUMENTS INC
元件分類: FIFO
英文描述: 512 X 18 OTHER FIFO, 20 ns, PDSO56
封裝: 0.300 INCH, SSOP-56
文件頁數(shù): 4/16頁
文件大小: 253K
代理商: SN74ALVC7803-40DLR
SN74ALVC7803
512 × 18
CLOCKED FIRST IN, FIRST OUT MEMORY
SDAS274 JANUARY 1995
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
TYPICAL CHARACTERISTICS
0
20
40
60
80
100
120
140
0
102030405060708090
I
Supply
Current
mA
CCf
SUPPLY CURRENT
vs
CLOCK FREQUENCY
fclock Clock Frequency MHz
VCC = 3.6 V
VCC = 3.3 V
VCC = 3 V
fdata = 1/2 fclock
TA = 75°C
CL = 0 pF
Figure 7
calculating power dissipation
With ICCf taken from Figure 7, the dynamic power (Pd), based on all data outputs changing states on each read,
can be calculated by using:
Pd = VCC × [ICC(f) + (N × ICC × dc)] + ∑(CL × VCC2 × fo)
A more accurate total power (PT) can be calculated if quiescent power (Pq) is also taken into consideration.
Quiescent power (Pq) can be calculated using:
Pq = VCC × [ICCI + (N × ICC × dc)]
Total power would be:
PT = Pd + Pq
The above equations provide worst-case power calculations.
Where:
N
= number of inputs driven by TTL levels
ICC = increase in power supply current for each input at a TTL high level
dc
= duty cycle of inputs at a TTL high level of 3.4 V
CL
= output capacitance load
fo
= switching frequency of an output
ICCI
= idle current, supply current when FIFO is idle
≈ pF × fclock = 0.2 × fclock
(current is due to free-running clocks)
pF
= power factor (the slope of idle current versus clock frequency).
ICCf
= active current, supply current when FIFO is transferring data
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