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74HC423 データシート(PDF) 8 Page - NXP Semiconductors

部品番号 74HC423
部品情報  Dual retriggerable monostable multivibrator with reset
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC423 データシート(HTML) 8 Page - NXP Semiconductors

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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.


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