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LMV393M bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI) |
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LMV393M bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI) |
11 / 21 page Application Circuits (Continued) Driving CMOS and TTL The comparator’s output is capable of driving CMOS and TTL Logic circuits. AND Gates The comparator can be used as three input AND gate. The operation of the gate is as follow: The resistor divider at the inverting input establishes a refer- ence voltage at that node. The non-inverting input is the sum of the voltages at the inputs divided by the voltage dividers. The output will go high only when all three inputs are high, casing the voltage at the non-inverting input to go above that at inverting input. The circuit values shown work for a ″0″ equal to ground and a ″1″ equal to 5V. The resistor values can be altered if different logic levels are desired. If more inputs are required, diodes are recom- mended to improve the voltage margin when all but one of the inputs are high. OR Gates A three input OR gate is achieved from the basic AND gate simply by increasing the resistor value connected from the inverting input to V cc, thereby reducing the reference volt- age. A logic ″1″ at any of the inputs will produce a logic ″1″ at the output. ORing the Output By the inherit nature of an open collector comparator, the outputs of several comparators can be tied together with a pull up resistor to V cc. If one or more of the comparators out- puts goes low, the output V o will go low. DS100080-5 FIGURE 10. Driving CMOS DS100080-6 FIGURE 11. Driving TTL DS100080-11 FIGURE 12. AND Gate DS100080-10 FIGURE 13. OR Gate www.national.com 11 |
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Mô tả tương tự - LMV393M |
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