These dc triggered multivibrators feature pulse width control by three meth- ods. The basic pulse width is programmed by selection of external resistance. DM Dual Retriggerable One-Shot with Clear and. Complementary Outputs . General Description. Features. The ‘ is a dual retriggerable monostable. The 74HC and 74HCT are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). The 74HC; 74HCT .
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Discussion in ‘ General Electronics Chat ‘ started by semi12May 14, May 14, 1. May 14, 3 0. I’m not sure why it doesn’t? I’ve been trying to find the spec on minimum input pulse width but no luck so far.
May 14, 2. Apr 20, 15, Are you sure the pulse meets the TTL logic level requirement? May adtasheet, 3.
Apr 26, 3, 1, Read through this thread http: May 14, 4. I’m datasneet sure the input pulse is TTL-compatible, because I’m using a function generator to supply the input pulse. For example, at 1us it works fine. Attached is the schematic.
Datashete 14, 5. Jan 28, 9, It will not solve your minimum input pulse width problem but it will make the output pulse width adjustment better.
Datasheet, PDF – Alldatasheet
May 14, 6. Which test results that lead you to believe it’s not working as you designed? I mean, within a few nanoseconds after the input pulse, did Q go high or did it remain low? Can you post the pic of your oscilloscope presentation?
What model oscilloscope are you using to assist you with your troubleshooting? Your delayed output seems abnormally long. Do you need that type of a delay? What is your variable resistor set at?
74123 Datasheet PDF
May 14, 7. Jan 23, 1. In pdf spec at the link below, under general operating conditions, it specifies a pulse duration of 40 nanseconds. I’m not sure if this refers to the input pulse. May 15, 8. The problem only happens when I start decreasing the input pulse width.
The output pulse simply disappears the chip no longer reacts to the trigger pulse. May 15, 9. Apr 27, 1, It is even faster than the 74LS family.
using 74LS | All About Circuits
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