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54121FMQB Fiches technique(PDF) 4 Page - National Semiconductor (TI) |
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54121FMQB Fiches technique(HTML) 4 Page - National Semiconductor (TI) |
4 / 6 page 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 |
Numéro de pièce similaire - 54121FMQB |
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Description similaire - 54121FMQB |
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