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MC14538BF Scheda tecnica(PDF) 9 Page - ON Semiconductor |
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MC14538BF Scheda tecnica(HTML) 9 Page - ON Semiconductor |
9 / 12 page MC14538B http://onsemi.com 9 POWER–DOWN CONSIDERATIONS Large capacitance values can cause problems due to the large amount of energy stored. When a system containing the MC14538B is powered down, the capacitor voltage may discharge from VDD through the standard protection diodes at pin 2 or 14. Current through the protection diodes should be limited to 10 mA and therefore the discharge time of the VDD supply must not be faster than (VDD). (C)/(10 mA). For example, if VDD = 10 V and CX = 10 µF, the VDD supply should discharge no faster than (10 V) x (10 µF)/(10 mA) = 10 ms. This is normally not a problem since power supplies are heavily filtered and cannot discharge at this rate. When a more rapid decrease of VDD to zero volts occurs, the MC14538B can sustain damage. To avoid this possibility use an external clamping diode, DX, connected as shown in Fig. 11. Figure 11. Use of a Diode to Limit Power Down Current Surge VSS Dx VDD VDD Rx Cx Q Q RESET Figure 12. Retriggerable Monostables Circuitry Figure 13. Non–Retriggerable Monostables Circuitry CX RX VDD Q Q RESET = VDD B = VDD A B RISING–EDGE TRIGGER CX RX VDD Q Q RESET = VDD B A = VSS FALLING–EDGE TRIGGER CX RX VDD Q Q A B RESET = VDD CX RX VDD Q Q RESET = VDD A B FALLING–EDGE TRIGGER RISING–EDGE TRIGGER NC NC NC VDD VDD A B Figure 14. Connection of Unused Sections Q Q CD TYPICAL APPLICATIONS |
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