|74LV123DB,112||Dual retriggerable monostable multivibrator with reset|
|74LV123DB,112 Datasheet PDF : 24 Pages |
12.1.3 Reset timing
Dual retriggerable monostable multivibrator with reset
nA = LOW
Fig 13. Output pulse control using reset input nRD
12.2 Power considerations
When the monostable multivibrator is powered-up, it may produce an output pulse with a
pulse width defined by the values of REXT and CEXT. This output pulse can be eliminated
using the RC circuit on pin nRD shown in Figure 14.
A large capacitor (CEXT) may cause problems when powering-down the monostable due
to the energy stored in this capacitor. When a system containing this device is
powered-down or a rapid decrease of VCC to zero occurs, the monostable may sustain
damage, due to the capacitor discharging through the input protection diodes. To avoid
this possibility, connect a damping diode DEXT (preferably a germanium or Schottky type
diode) able to withstand large current surges - see Figure 14.
Product data sheet
Fig 14. Power-up and power-down circuit
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 12 December 2011
© NXP B.V. 2011. All rights reserved.
15 of 24
|Direct download click here|
|Share Link :|