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CD74HC4538QPWRG4Q1 Scheda tecnica(PDF) 9 Page - Texas Instruments |
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CD74HC4538QPWRG4Q1 Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 16 page CD74HC4538-Q1 HIGH-SPEED CMOS LOGIC DUAL RETRIGGERABLE PRECISION MONOSTABLE MULTIVIBRATOR SCLS595A − NOVEMBER 2004 − REVISED APRIL 2008 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL APPLICATION DATA 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 pin 14. To avoid possible device damage in this mode when CX is w 0.5 µF, a protection diode with a 1-A rating or higher (1N5395 or equivalent) and a separate ground return for CX should be provided (see Figure 5). An alternate protection method is shown in Figure 6, where a 51- Ω current-limiting resistor is inserted in series with CX . Note that a small pulse-duration decrease occurs, however, and RX must be increased appropriately to obtain the originally desired pulse duration. Figure 5. Rapid-Power-Down Protection Circuit RX CX ≥0.5 µF 2 (14) 1 (15) 16 8 VCC Figure 6. Alternative Rapid-Power-Down Protection Circuit RX 51 Ω CX ≥0.5 µF 2 (14) 1 (15) 16 8 VCC |
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