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AX2000 数据表(PDF) 39 Page - Microsemi Corporation |
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AX2000 数据表(HTML) 39 Page - Microsemi Corporation |
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39 / 262 page ![]() Axcelerator Family FPGAs Re vi s i on 18 2 - 25 3.3 V LVTTL Low-Voltage Transistor-Transistor Logic is a general purpose standard (EIA/JESD) for 3.3 V applications. It uses an LVTTL input buffer and push-pull output buffer. AC Loadings Table 2-20 • DC Input and Output Levels VIL VIH VOL VOH IOL IOH Min., V Max., V Min., V Max., V Max., V Min., V mA mA –0.3 0.8 2.0 3.6 0.4 2.4 24 –24 Figure 2-15 • AC Test Loads Table 2-21 • AC Waveforms, Measuring Points, and Capacitive Load Input Low (V) Input High (V) Measuring Point* (V) VREF (typ) (V) Cload (pF) 0 3.0 1.40 N/A 35 Note: * Measuring Point = VTRIP R to VCCI for tplz / tpzl R to GND for tphz / tpzh 35 pF for tpzh / tpzl 5 pF for tphz / tplz Test Point Test Point 35 pF for tristate R=1k for tpd |
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