Key facts
- Brand
- Philips
- Model
- HCT123
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-07-02
Start here
Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
The Philips 74HC/HCT123 are high-speed Si-gate CMOS devices that function as dual retriggerable monostable multivibrators with reset. They are pin compatible with low power Schottky TTL (LSTTL) and feature Schmitt-trigger action on all inputs except the reset input. The output pulse width is controlled by external timing components, and the circuit can be retriggered for very long pulses up to a 100% duty factor.
Read onlinePhilips HCT123 specifications
| Propagation delay (nA, nB to nQ) | 26 ns (typical) |
|---|---|
| Output pulse width formula | tw = 0.45 x Rext x Cexr |
| Supply voltage range (HC) | -40 to +85 V |
Source: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
All Philips HCT123 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
Can the output pulse be extended?
Yes, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB).
From: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
How is the output pulse terminated?
An output delay can be terminated at any time by a LOW-going edge on input nRp, which also inhibits the triggering.
From: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
How is the output pulse width controlled?
The output pulse width is controlled by the selection of an external resistor (Rext) and capacitor (Cext).
From: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
Can the output pulse be extended?
Yes, the output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB).
From: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator Datasheet
What type of inputs does the 74HC/HCT123 have?
It has Schmitt‑trigger action on all inputs except the reset input.
From: Philips 74HC/HCT123 Dual Retriggerable Monostable Multivibrator with Reset Datasheet