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SN74ALVC7804DL データシート(PDF) 9 Page - Texas Instruments |
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SN74ALVC7804DL データシート(HTML) 9 Page - Texas Instruments |
9 / 11 page SN74ALVC7804 512 × 18 FIRST-IN, FIRST-OUT MEMORY SCAS432 – JANUARY 1995 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 0 20 40 60 80 100 120 140 0 102030405060708090 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 4 calculating power dissipation With ICC(f) taken from Figure 4, 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 will 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 ICC versus frequency) ICC(f) = active current, supply current when FIFO is transferring data |
同様の部品番号 - SN74ALVC7804DL |
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同様の説明 - SN74ALVC7804DL |
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