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CD14538BMS View Datasheet(PDF) - Intersil

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CD14538BMS Datasheet PDF : 9 Pages
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Specifications CD14538BMS
TABLE 9. FUNCTIONAL TERMINAL CONNECTIONS
VDD TO TERM #
VSS TO TERM #
INPUT PULSE TO TERM #
FUNCTION
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
Trailing-Edge Trigger/
3
13
4
12
5
11
Retriggerable
Trailing-Edge Trigger/
Non-Retriggerable
3
13
5
11
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.
INPUT PULSE TRAIN
RETRIGGERABLE MODE PULSE
WIDTH (+TR MODE)
NON-RETRIGGERABLE MODE
PULSE WIDTH (+TR MODE)
OTHER CONNECTIONS
MONO1 MONO2
5-7
11 - 9
4-6
12 - 10
T
T
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 however,
and RX must be appropriately increases to obtain the origi-
nally desired pulse width.
IN5395
OR
EQUIVALENT
RX
2(14)
VDD
16
+
CX
0.5µfd
1(15)
VSS
8
VSS
FIGURE 1. RAPID POWER-DOWN PROTECTION CIRCUIT
VDD
RX
2(14)
16
51 OHMS
+
1(15)
CX
0.5µfd
8
VSS
FIGURE 2. ALTERNATE RAPID POWER-DOWN PROTECTION
CIRCUIT
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 reli-
able. 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.
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