74HC123PW-Q100,118 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
74HC123PW-Q100,118 Datasheet PDF : 23 Pages
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NXP Semiconductors
74HC123-Q100; 74HCT123-Q100
Dual retriggerable monostable multivibrator with reset
12.3 Power-down considerations
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. The damage is due to the capacitor discharging through the input protection
diodes. To avoid this possibility, use a damping diode (DEXT) and connect as shown in
Figure 15. DEXT is preferably a germanium or Schottky type diode able to withstand large
current surges.
DEXT
CEXT
REXT
VCC
GND
nCEXT nREXT/CEXT
8
14 (6)
15 (7)
123
1 (9)
nA
nB
2 (10)
13 (5)
nQ
4 (12)
nQ
Fig 15. Power-down protection circuit
3 (11)
nRD
001aaa614
74HC_HCT123_Q100
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 1 August 2012
© NXP B.V. 2012. All rights reserved.
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