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74LV123D,118 View Datasheet(PDF) - NXP Semiconductors.

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74LV123D,118 Datasheet PDF : 24 Pages
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NXP Semiconductors
74LV123
Dual retriggerable monostable multivibrator with reset
0.8
'K'
factor
0.6
0.4
0.2
001aae529
106
tW
(ns)
105
104
REXT = 100 kΩ
50 kΩ
10 kΩ
2 kΩ
103
102
001aae530
0
0
2
4
6
VCC (V)
CEXT = 10 nF; REXT = 10 kto 100 k
Fig 10. Typical ‘K’ factor as a function of VCC
0
1
10
102
103
104
Cext (pF)
VCC = 3.3 V and Tamb = 25 C
Fig 11. Typical output pulse width as a function of the
external capacitance values
12.1.2 Retrigger timing
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 pulses meets the minimum retrigger time. If CEXT > 10 pF, the
next formula for the set-up time of a retrigger pulse is valid:
at VCC = 5.0 V: trtrig = 30 + 0.19REXT CEXT0.9 + 13 REXT1.05 (typ.)
at VCC = 3.0 V: trtrig = 41 + 0.15REXT CEXT0.9 1 REXT (typ.)
where:
trtrig = retrigger time in ns
CEXT = external capacitor in pF
REXT = external resistor in k
nB input
tW
nA input
trtrig
nQ output
tW
tW
nRD = HIGH
Fig 12. Output pulse control using retrigger pulse nA
tW
001aae526
74LV123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 12 December 2011
© NXP B.V. 2011. All rights reserved.
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