Hello,I am using 74ABT04 HEX inverter to create a good high quality delay and pulse rise and fall.
However when i cascade 4 of them i get only 6ns delay from the input and output as shown below.
Is there some digital buffer component which will create a delay of 50ns for example?
Thanks.

 

It looks to all that most of the delay is coming during the rise time of the input pulse. The pulses to the subsequent stages do not have that slow rise time, so there is much less delay. Note that the output of the gates hits its peak before the input signal does.

 

You can buy digital delays with different delay times.

https://rocelec.widen.net/view/pdf/cehhj9rbxx/MAXMS15694-1.pdf

 

Digi-Key has many delay lines with both silicon and L-C delay elements. Here is one that gets you taps from 30 to 70 ns.

https://www.digikey.com/en/products...ABVEyNGAHl0AFl8TFwOAz5BEABacWhJKEMOOSdKTX48oA

https://www.digikey.com/en/products/filter/delay-lines/688

ak

 

Use 74xxx17, add RC which makes the delay.

 

Hello,I am using 74ABT04 HEX inverter to create a good high quality delay and pulse rise and fall.
However when i cascade 4 of them i get only 6ns delay from the input and output as shown below.
Is there some digital buffer component which will create a delay of 50ns for example?
Thanks.
View attachment 325923

View attachment 325924
View attachment 325925

If this is for simulation purposes only, you can use an LTspice 'A' device inverter with all the appropriate attributes set per the 74ABT04 datasheet. Params can then be used to step different supply voltages to see the delay vs supply behavior.

 

Hello,I am using 74ABT04 HEX inverter to create a good high quality delay and pulse rise and fall.
However when i cascade 4 of them i get only 6ns delay from the input and output as shown below.
Is there some digital buffer component which will create a delay of 50ns for example?
Thanks.

How do you define "good quality" delay and pulse rise and fall?

Relying on switching threshold and delay times through logic gates is probably not going to result an anything that would be considered "good quality", but may it might for your application. Make a copy and the new one will be different. Replace the IC and the delay will change. It will be different when the room is hot than when it is cold. It will change with supply voltage. These may all be small enough that it still meets your definition of "good quality", but I doubt it.

As others have said, there are parts specifically made for this purpose that are dirt cheap. Why reinvent the wheel?

 

Hello, I chose the DS1110S-100.
The is no spice model,
What is the allowed rise and fall time of theinput pulse?
there is no value for the rising time.
Thanks.
https://www.analog.com/media/en/technical-documentation/data-sheets/DS1110.pdf
https://www.digikey.co.uk/en/products/detail/analog-devices-inc-maxim-integrated/DS1110S-100/1196749

 

What do you mean. It says to look at Note 6. Note 6 says to look at the Test Conditions. The Test Conditions used a maximum rise time of 3 ns.

It will almost certainly work with somewhat slower rise times, but that is not characterized or guaranteed.

You need not over look the Notes in datasheets. They are there for a reason.

 

Hello ,regarding the ampitude of the output signal.
THe input signal amplitude and Vcc play a role in deciding the pulse.
my input is 74ABT04 Hex inverter data sheet shown below.

The input of 74ABT04 is 0-3.3V Vcc=5V.
What will be the output pulse of 74ABT04 in such case given the data sheet.
https://eu.mouser.com/datasheet/2/916/74ABT04-1541721.pdf