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CD74HC4538M 데이터시트(PDF) 10 Page - Texas Instruments

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부품명 CD74HC4538M
상세설명  High-Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator
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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
CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538


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