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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD74AC датащи(PDF) 34 Page - Hitachi Semiconductor |
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HD74AC датащи(HTML) 34 Page - Hitachi Semiconductor |
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34 / 52 page  Design Considerations 33 ECL devices cannot directly drive FACT devices. Interfacing FACT-to-ECL can be accomplished by using TTL-to-ECL translators and 10125 ECL-to-TTL translators in addition to following the same rules on the TTL outputs to CMOS inputs (i.e., a resistor pull-up to V CC of approximately 4.7 kΩ). The translation can also be accomplished by a resistive network. A three-resistor interface between FACT and ECL logic is illustrated in figure 4. Figures 5 and 6 show the translation from ECL-to-FACT, which is somewhat more complicated. These two examples offer some possible interfaces between ECL and FACT logic. AC/ACT +5V 560 Ω 510 Ω –5.2V 470 Ω Figure 4 Resistive FACT-to-ECL Translation 270 510 T1 T2 D2 D1 5.0V 510 Vbb AC ECL T1,T2 - 2SC641 (K) D1,D2 - HP5082 - 2811 –5.2V Figure 5 Single-Ended ECL-to-HD74AC Circuit |
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