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74HCT423DB датащи(PDF) 8 Page - NXP Semiconductors |
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74HCT423DB датащи(HTML) 8 Page - NXP Semiconductors |
8 / 14 page 1998 Jul 08 8 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT423 Notes 1. For other REXT and CEXT combinations see Fig.9. If CEXT > 10 pF, the next formula is valid: tW =K × REXT × CEXT (typ.) where: tW = output pulse width in ns; REXT = external resistor in kΩ;CEXT = external capacitor in pF; K = constant = 0.45 for VCC = 5.0 V and 0.55 for VCC = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 2. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid: trt =30 + 0.19 × REXT × CEXT0.9 + 13 × REXT1.05 (typ.) where, trt = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in kΩ. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. 3. When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF. AC WAVEFORMS Fig.7 Output pulse control using retrigger pulse; nRD = HIGH. Fig.8 Output pulse control using reset input nRD; nA = LOW. |
Аналогичный номер детали - 74HCT423DB |
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Аналогичное описание - 74HCT423DB |
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