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DM54121W Fiches technique(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce DM54121W
Description  One-Shot with Clear and Complementary Outputs
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54121W Fiches technique(HTML) 4 Page - National Semiconductor (TI)

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Operating Rules (Continued)
5 Output pulse width versus VCC and operation tempera-
tures
Figure 3 depicts the relationship between pulse
width variation versus VCC Figure 4 depicts pulse width
variation versus ambient temperature
TLF6538 – 4
FIGURE 3
TLF6538 – 5
FIGURE 4
6 The ‘‘K’’ coefficient is not a constant but varies as a
function of the timing capacitor CX Figure 5 details this
characteristic
TLF6538 – 6
FIGURE 5
7 Under any operating condition CX and RX must be kept
as close to the one-shot device pins as possible to mini-
mize stray capacitance to reduce noise pick-up and to
reduce I c R and Ldidt voltage developed along their
connecting paths If the lead length from CX to pins (10)
and (11) is greater than 3 cm for example the output
pulse width might be quite different from values predicted
from the appropriate equations A non-inductive and low
capacitive path is necessary to ensure complete dis-
charge of CX in each cycle of its operation so that the
output pulse width will be accurate
8 VCC and ground wiring should conform to good high-fre-
quency standards and practices so that switching tran-
sients on the VCC and ground return leads do not cause
interaction between one-shots A 001 mF to 010 mF by-
pass capacitor (disk ceramic or monolithic type) from VCC
to ground is necessary on each device Furthermore the
bypass capacitor should be located as close to the VCC-
pin as space permits
For further detailed device characteristics and output performance please
refer to the NSC one-shot application note AN-366
4


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