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CD14538BMS Datasheet(数据表) 6 Page - Intersil Corporation

部件型号  CD14538BMS
说明  CMOS Dual Precision Monostable Multivibrator
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
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CD14538BMS Datasheet(HTML) 6 Page - Intersil Corporation

   
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All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
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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