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DM54123J-MIL Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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DM54123J-MIL Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 6 page Operating Rules (Continued) 6 The retriggerable pulse width is calculated as shown be- low 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 FIGURE 4 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 4 |
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