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Fabricante

74HCT123
(Rev.:2009)

Dual retriggerable monostable multivibrator with reset

NXP Semiconductors. 

NXP Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

12. Application information

12.1 Timing component connections

The basic output pulse width is essentially determined 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 it is recommended to 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_5

Product data sheet

Rev. 05 — 13 July 2009

© NXP B.V. 2009. All rights reserved.

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