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DM74LS123 Scheda tecnica(PDF) 4 Page - National Semiconductor (TI) |
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DM74LS123 Scheda tecnica(HTML) 4 Page - National Semiconductor (TI) |
4 / 6 page Operating Rules (Continued) 5 For CX k 1000 pF see Figure 3 for TW vs CX family curves with RX as a parameter TLF6386 – 3 FIGURE 3 6 To obtain variable pulse widths by remote trimming the following circuit is recommended TLF6386 – 4 FIGURE 4 Note ‘‘Rremote’’ should be as close to the device pin as possible 7 The retriggerable pulse width is calculated as shown be- low T e TW a tPLH e K c RX c CX a tPLH The retriggered pulse width is equal to the pulse width plus a delay time period (Figure 5) TLF6386 – 5 FIGURE 5 8 Output pulse width variation versus VCC and tempera- tures Figure 6 depicts the relationship between pulse width variation versus VCC and Figure 7 depicts pulse width variation versus temperatures TLF6386 – 6 FIGURE 6 TLF6386 – 7 FIGURE 7 9 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-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 ensure complete discharge of CX in each cycle of its operation so that the output pulse width will be accurate 10 The CEXT pins of this device are internally connected to the internal ground For optimum system performance they should be hard wired to the system’s return ground plane 11 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 bypass capacitor (disk ceramic or monolithic type) from VCC to ground is necessary on each device Further- more 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-372 4 |
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Descrizione simile - DM74LS123 |
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