question:
using a 74HC04 for inverting a signal line should make a delay of about 6ns as datasheet tells.
If i make a cmos pair inverter from BS170/BS250, how fast will this be? how do i find how fast it is? measure some way or caslculate.
Are there better transistors i should try instead of these?
using a 74HC04 for inverting a signal line should make a delay of about 6ns as datasheet tells.
If i make a cmos pair inverter from BS170/BS250, how fast will this be? how do i find how fast it is? measure some way or caslculate.
Are there better transistors i should try instead of these?
till said:
I think the HC04 propagation delay, under normal conditions, is more like 10ns. Why don't you just use faster logic?
74HC04 was the fastest i found on first look at Reichelt, and it says 6ns at 5V.
As i only need one inverter and don´t like all those unused pins i would prefer to use discrete inverter. Whats against building it from 2 Fets? How to build it discret for beeing fast?
As i only need one inverter and don´t like all those unused pins i would prefer to use discrete inverter. Whats against building it from 2 Fets? How to build it discret for beeing fast?
Make your own inverter out of FETs, if you like. If I wanted a single, fast inverter without the baggage of a DIP, I'd look at a pico-gate, like the 74V1GU04. Its prop delay is 3.5ns @ 5v.
I allready made it, and i like it more than having loads of unused inverters on my board. What i want to know is how to obtain some information about the discrete inverters performance, and if there are better transistors for this purpose than BS170/BS250.
Picogates and faster ICs are no solution as long as my supplyers don´t stock them and they are not avaiable, not even as sample.
Picogates and faster ICs are no solution as long as my supplyers don´t stock them and they are not avaiable, not even as sample.
One Gate
Hello Till,
Fairchild and Onsemi can send you one inverter per package as a sample. The latter will cost you US$ 14.99.
BTW my mail through the forum did not reach you as your server apparently did not accept it:
"The recipient does not accept mails from 'hotmail.com' over foreign mailservers".
ELSO/😕
Hello Till,
Fairchild and Onsemi can send you one inverter per package as a sample. The latter will cost you US$ 14.99.
BTW my mail through the forum did not reach you as your server apparently did not accept it:
"The recipient does not accept mails from 'hotmail.com' over foreign mailservers".
ELSO/😕
OK......why the concern over delay time????
BTW..........you know someone who has a handful of picogates........
Jocko
BTW..........you know someone who has a handful of picogates........
Jocko
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