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CD14538BMS bảng dữ liệu(PDF) 6 Page - Intersil Corporation

tên linh kiện CD14538BMS
Giải thích chi tiết về linh kiện  CMOS Dual Precision Monostable Multivibrator
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nhà sản xuất  INTERSIL [Intersil Corporation]
Trang chủ  http://www.intersil.com/cda/home
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CD14538BMS bảng dữ liệu(HTML) 6 Page - Intersil Corporation

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Specifications CD14538BMS
TABLE 9. FUNCTIONAL TERMINAL CONNECTIONS
FUNCTION
VDD TO TERM #
VSS TO TERM #
INPUT PULSE TO TERM #
OTHER CONNECTIONS
MONO1
MONO2
MONO1
MONO2
MONO1
MONO2
MONO1
MONO2
Leading-Edge Trigger/
Retriggerable
3, 5
11, 13
4
12
Leading-Edge Trigger/
Non-Retriggerable
3
13
4
12
5 - 7
11 - 9
Trailing-Edge Trigger/
Retriggerable
3
13
4
12
5
11
Trailing-Edge Trigger/
Non-Retriggerable
3
13
5
11
4 - 6
12 - 10
NOTE:
1. A triggerable one-shot multivibrator has an output pulse width
which is extended one full time period (T) after application of
the last trigger pulse.
2. A non-triggerable one-shot multivibrator has a time period (T)
referenced from the application of the first trigger pulse.
T
T
INPUT PULSE TRAIN
RETRIGGERABLE MODE PULSE
WIDTH (+TR MODE)
NON-RETRIGGERABLE MODE
PULSE WIDTH (+TR MODE)
Power-Down Mode
During a rapid power-down condition, as would occur with a
power-supply short circuit or with a poorly filtered power sup-
ply, the energy stored in CX could discharge into Pin 2 or 14.
To avoid possible device damage in this mode, when CX is ≥
0.5 microfarad, 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 1.
An alternate protection method is shown in Figure 2, where
a 51-ohm current-limiting resistor is inserted in series with
CX. Note that a small pulse width decrease will occur how-
ever, and RX must be appropriately increases to obtain the
originally desired pulse width.
FIGURE 1. RAPID POWER-DOWN PROTECTION CIRCUIT
FIGURE 2. ALTERNATE RAPID POWER-DOWN PROTECTION
CIRCUIT
VDD
VSS
16
8
RX
2(14)
1(15)
VSS
CX
≥ 0.5µfd
+
IN5395
OR
EQUIVALENT
VDD
VSS
16
8
RX
2(14)
1(15)
CX
≥ 0.5µfd
+
51 OHMS


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