74HC423: Dual retriggerable monostable multivibrator with reset
The 74HC423 is a dual retriggerable monostable multivibrator with output pulse width control by
two methods. The basic pulse time is programmed by selection of an external resistor
(REXT) and capacitor (CEXT). Once triggered, the basic output
pulse width may be extended by retriggering (nA) or (nB). By repeating this process, the
output pulse period (nQ = HIGH, nQ = LOW) can be made as
long as desired. When nRD is LOW, it forces the nQ output
LOW, the nQ output HIGH and also inhibits the triggering. Schmitt-trigger action in the
nA and nB inputs, makes the circuit highly tolerant to
slower input rise and fall times. The '423' is identical to the '123' but cannot be
triggered via the reset input. Inputs include clamp diodes. This enables the use of
current limiting resistors to interface inputs to voltages in excess of
VCC.
74HC423: Product Block Diagram
74HC423: Block Diagram
sot109-1_3d
Data Sheets (1)
Application Notes (2)
Users Guides (1)
| Name/Description | Modified Date |
|---|
| HC/T User Guide (REV 1.0) PDF (508.0 kB) HCT_USER_GUIDE [English] | 01 Nov 1997 |
Package Information (2)
Packing (1)
Supporting Information (2)
Ordering Information
| Product | Status |
|---|
| 74HC423BQ | Active |
| 74HC423D | Active |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | EFR | IFR(FIT) | MTBF(hour) | MSL | MSL LF |
|---|
| 74HC423BQ |  | SOT763-1 | | Reel 7" Q1/T1 | Active | 74HC423BQ,115
(9352 854 28115) | HC423 | 74HC423BQ |    | Always Pb-free | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
| 74HC423D | | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE
SO-SOJ-REFLOW
SO-SOJ-WAVE | Reel 13" Q1/T1 CECC | Active | 74HC423D,653
(9337 148 70653) | 74HC423D | 74HC423D | | week 6, 2004 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
| Bulk Pack, CECC | Active | 74HC423D,652
(9337 148 70652) | 74HC423D | 74HC423D | | week 6, 2004 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
