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. Application information
12.1 Timing component connections
The basic output pulse width is defined by the values of the external timing components
REXT and CEXT.
(1) 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
3 (11)
nRD
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(1) For minimum noise generation, ground pins 6 (2CEXT) and 14 (1CEXT) externally to pin 8 (GND).
Fig 13. Timing component connections
12.2 Power-up considerations
When the monostable 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
circuit shown in Figure 14.
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
3 (11)
nRD
RESET
VCC
Fig 14. Power-up output pulse elimination circuit
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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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