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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CD54HC4538F датащи(PDF) 10 Page - Texas Instruments |
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CD54HC4538F датащи(HTML) 10 Page - Texas Instruments |
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10 / 18 page  10 Power-Down Mode During a rapid power-down condition, as would occur with a power-supply short circuit with a poorly filtered power supply, the energy stored in CX could discharge into Pin 2 or 14. To aviod possible device damage in this mode, when CX is ≥ 0.5 µF, a protection diode with a 1 ampere or higher rating (1N5395 or equivalent) and a separate ground return for CX should be provided as shown in Figure 12. An alternate protection method is shown in Figure 13, where a51 Ω current-limiting resistor is inserted in series with CX. Note that a small pulse width decrease will occur however, and RX must be appropriately increased to obtain the origi- nally desired pulse width. FIGURE 12. RAPID POWER-DOWN PROTECTION CIRCUIT IN5395 OR EQUIVALENT RX CX ≥0.5µF 1(15) 2(14) VCC 16 8 + FIGURE 13. ALTERNATE RAPID POWER-DOWN PROTECTION CIRCUIT RX CX ≥0.5µF 1(15) 2(14) VCC 16 8 51 Ω CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538 |
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