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CD74HC4538QPWRG4Q1 Scheda tecnica(PDF) 9 Page - Texas Instruments

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Il numero della parte CD74HC4538QPWRG4Q1
Spiegazioni elettronici  HIGH-SPEED CMOS LOGIC DUAL RETRIGGERABLE PRECISION MONOSTABLE MULTIVIBRATOR
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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
CX
≥0.5 µF
2 (14)
1 (15)
16
8
VCC


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