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SN74ALS235 Folha de dados(PDF) 11 Page - Texas Instruments |
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SN74ALS235 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 15 page SN74ALS235 64 × 5 ASYNCHRONOUS FIRST IN, FIRST OUT MEMORY SDAS108A − OCTOBER 1986 − REVISED SEPTEMBER 1993 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 switching characteristics (see Figure 9) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† UNIT MIN TYP MAX MIN MAX fmax SI 30 25 MHz fmax SO 30 25 MHz tw‡ IR high 15 8 ns tw§ OR high 19 8 ns td(QV-ORH) Q valid before OR ↑ 6 9 −5 12 ns td(SOL-QX) Q valid after SO ↓ 13 4 ns tpd SI ↓ Q 600 800 350 1000 ns tPHL SI ↑ IR 20 26 8 30 ns tPLH SI ↓ IR 16 21 6 25 ns tPLH¶ SI ↓ OR 600 800 350 1000 ns tPHL SI ↓ AF/AE 550 700 290 880 ns tPLH SI ↓ AF/AE 85 115 40 150 ns tPLH SI ↓ HF 340 410 180 510 ns tpd SO ↓ Q 13 17 4 22 ns tPHL SO ↑ OR 23 27 7 33 ns tPLH SO ↓ OR 20 24 6 30 ns tPLH¶ SO ↓ IR 600 800 350 1000 ns tPHL SO ↓ AF/AE 550 700 290 880 ns tPLH SO ↓ AF/AE 85 115 35 150 ns tPHL SO ↓ HF 340 410 170 510 ns tPHL RST ↓ OR 22 26 10 34 ns tPLH RST ↑ IR 12 18 5 22 ns tPHL RST ↓ IR 12 18 5 22 ns tPHL RST ↓ Q 14 17 5 19 ns tdis OE ↑ Q 7 13 2 15 ns ten OE ↓ Q 6 12 2 13 ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ‡ The IR output pulse occurs when the FIFO is full, SI is high, and SO is pulsed (see Figure 4). § The OR output pulse occurs when the FIFO is empty, SO is high, and SI is pulsed (see Figure 3). ¶ Data throughput or fall-through times |
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