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SN74ACT2440FN bảng dữ liệu(PDF) 29 Page - Texas Instruments |
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SN74ACT2440FN bảng dữ liệu(HTML) 29 Page - Texas Instruments |
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29 / 33 page ![]() SN74ACT2440 NuBus ™ INTERFACE CONTROLLER SCHS010 – D3158, OCTOBER 1988 – REVISED JANUARY 1991 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 29 switching characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER MIN TYP MAX UNIT fmax Clock frequency, CLK 10 MHz NuBus ™ card-slot signals, CL = 300 pF† PARAMETER LOAD MIN TYP‡ MAX UNIT tpd Propagation delay time, CLK ↑ to START R1 = 270 Ω, R2 = 470 Ω 20 32 ns tpd Propagation delay time, CLK ↑ to ACK R1 = 270 Ω, R2 = 470 Ω 20 32 ns tpd Propagation delay time, CLK ↑ to TMx R1 = 270 Ω, R2 = 470 Ω 20 32 ns tpd Enable time, NMREQ to NMRQ R1 = 270 Ω, R2 = 470 Ω 20 32 ns ten Enable time, CLK ↑ to RQST R1 = 91 Ω, R2 = 220 Ω 18 32 ns ten Enable time, CLK ↑ to START R1 = 270 Ω, R2 = 470 Ω 18 32 ns ten Enable time, CLK ↑ to ACK R1 = 270 Ω, R2 = 470 Ω 18 32 ns ten Enable time, CLK ↑ to TMx R1 = 270 Ω, R2 = 470 Ω 18 32 ns ten Enable time, CLK ↓ to ARBx R1 = 91 Ω, R2 = 220 Ω 20 35 ns ten Enable time, CLK ↑ to SPV R1 = 270 Ω, R2 = 470 Ω 23 45 ns NuBus ™ card-slot signals, CL = 50 pF† PARAMETER LOAD MIN TYP‡ MAX UNIT tdis Disable time, CLK ↑ to RQST R1 = 91 Ω, R2 = 220 Ω 13 20 ns tdis Disable time, CLK ↑ to START R1 = 270 Ω, R2 = 470 Ω 12 22 ns tdis Disable time, CLK ↑ to ACK R1 = 270 Ω, R2 = 470 Ω 10 18 ns tdis Disable time, CLK ↑ to TMx R1 = 270 Ω, R2 = 470 Ω 10 18 ns tdis Disable time, CLK ↑ to ARBx R1 = 91 Ω, R2 = 220 Ω 13 24 ns tdis Disable time, CLK ↑ to SPV R1 = 270 Ω, R2 = 470 Ω 10 18 ns † See Parameter Measurement Information for load circuit and voltage waveforms. ‡ All typical values are at VCC = 5 V, TA = 25°C. |
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