Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
I'm guessing you want to convert digital signal levels from ttl to 3.3V?
I have to do this all the time, the two best solutions are a 16244 line driver - just power it of 3.3V and it will output 3.3V signals driven from 5V signals. You'll only get around 4mA per line though.
The other alternative is to use an open collector buffer, where you can drive the any currwnt you want (up to the device limit), by choosing the appropriate pull up resistor.
For digital conversion you need just a resistor divisor for 5V to 3.3v and an open drain gate for 3.3V to 5V conversion. Also any 5V tolerant buffer recommended before.
National Semi, LTC, TI, and Maxim all have bunches of low-dropout voltage regulators (LDO's). Packages range from TO-220 down to SOT-23 and smaller. Or, you could use a single resistor and a zener diode, but low-voltage zeners are not very stable.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
