CD4007 Logic Level Shifter

Jul 16, 2017 8 Replies
J

See "CD4007_Logic_Level_Shifter.zip" on the S.E.D/Schematics Page of my website.



Had the original CD4007 designer been more free and not tied gates together, it could be done without the resistors. ...Jim Thompson



-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

formatting link
| 1962 |



I'm looking for work... see my website.



Thinking outside the box...producing elegant & economic solutions.


Vote
Twitter Facebook LinkedIn
J

Seems like a lot of parts.

John Larkin Highland Technology, Inc lunatic fringe electronics
Vote
Twitter Facebook LinkedIn
J

12 CMOS devices is a "lot"? Actually only 10 of the 12 are used, and you can eliminate two more if you don't care for a firmly buffered 0->15V output.

The CD4007 is not optimally partitioned for best LV to HV translation.

Show us you can do it with fewer devices... post a schematic. ...Jim Thompson

| James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I'm looking for work... see my website. Thinking outside the box...producing elegant & economic solutions.
Vote
Twitter Facebook LinkedIn
J

Not inside an IC. It is a lot if you need two chips and two resistors on a PCB.

Still two chips.

NPN, pullup resistor to +15, buffer out. Add 2nd buffer (which is free) and another resistor for hysteresis.

John Larkin Highland Technology, Inc lunatic fringe electronics
Vote
Twitter Facebook LinkedIn
K
2 chips and 2 resistors for a levelshift?

That would never survive one of our design reviews

Maybe I am missing out, having not followed the entire thread, but that can be done with one FET and 2 resistors to a tenth of the price

It is even bidirectional:

formatting link

Cheers

Klaus

Vote
Twitter Facebook LinkedIn
K

Or just a common emitter level shift if you can live with the signal inversion, plus maybe a speed up cap to reduce propagation delays due to slow BJT turn off

2 resistors and a BJT

Cheers

Klaus

Vote
Twitter Facebook LinkedIn
J

As previously posted, Level shifters...

The question at hand was, can it be done with a CD4007? Yes, it can. ...Jim Thompson

| James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I'm looking for work... see my website. Thinking outside the box...producing elegant & economic solutions.
Vote
Twitter Facebook LinkedIn
G

Nice.. thanks, (Still so many simple circuits I haven't seen...)

George H.

Vote
Twitter Facebook LinkedIn
J

One 4007 nfet and one resistor does the basic shift. Add the free buffers if you want more output drive.

John Larkin Highland Technology, Inc lunatic fringe electronics
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required