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SN74ACT2227 데이터시트(PDF) 11 Page - Texas Instruments |
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SN74ACT2227 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 18 page SN74ACT2227, SN74ACT2229 DUAL 64 × 1, DUAL 256 × 1 FIRST-IN, FIRST-OUT MEMORIES SCAS220C – JUNE 1992 – REVISED OCTOBER 1997 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS 0 5 10 15 20 25 30 35 40 0 102030405060 SINGLE FIFO SUPPLY CURRENT vs CLOCK FREQUENCY fclock – Clock Frequency – MHz fI = 1/2 fclock TA = 75°C CL = 0 pF VCC = 5.5 V VCC = 5 V VCC = 4.5 V Figure 5 calculating power dissipation Data for Figure 5 is taken with one FIFO active and one FIFO idle on the device. The active FIFO has both writes and reads enabled with its read clock (RDCLK) and write clock (WRTCLK) operating at the rate specified by fclock. The data input rate and data output rate are half the fclock rate, and the data output is disconnected. A close approximation to the total device power can be found by Figure 5, determining the capacitive load on the data output and determining the number of SN74ACT2227/2229 inputs driven by TTL high levels. With ICC(f) taken from Figure 5, the maximum power dissipation (PT) of one FIFO on the SN74ACT2227 or SN74ACT2229 can be calculated by: PT = VCC × [ICC(f) + (N × ∆ICC × dc)] + (CL × VCC2 × fo) 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 capacitive load fo = switching frequency of an output |
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