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DM54123 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM54123
Description  Dual Retriggerable One-Shot with Clear and Complementary Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54123 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Operating Rules (Continued)
6 The retriggerable pulse width is calculated as shown be-
T e TW a tPLH e Kc RX c CX a tPLH
The retriggered pulse width is equal to the pulse width
plus a delay time period
(Figure 4)
TLF6539 – 6
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 (6)
and (7) or pins (14) and (15) 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 en-
sure complete discharge of CX in each cycle of its opera-
tion 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

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