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74HCT123 查看數據表(PDF) - Philips Electronics

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74HCT123 Datasheet PDF : 17 Pages
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Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT123
Notes to AC characteristics
1. For other REXT and CEXT combinations see Fig.9.
If CEXT > 10 nF, the next formula is valid:
tW = K × REXT × CEXT (typ.)
where: tW = output pulse width in ns;
REXT = external resistor in k; CEXT = external capacitor in pF;
K = constant = 0.55 for VCC = 5.0 V and 0.48 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 k.
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.
1998 Jul 08
9

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