Can we use a tristate buffer in place of voltage level shifter?

Thread Starter

sharath_412

Joined May 7, 2007
32
Hi,
We need voltage convertion from 5 volts to 3.3 volts( TTL compatible).
For this can i use a tristate buffer ( supply =3.3V, input voltage range is -.5 to 5.5 volts, o/p is TTL compatible) in place of a level shifter( Vcc=3.3).


Q1. In the datasheet of tristate buffer he specified currents for logic 1 and logic 0 as
logic '1' output current -20 mA
logic '0' output current +20 mA

Is this same for all tristate buffers?
When we connect some component at the o/p of that tristatebuffer what are the issues I have to take care about?


thanks
sharath
 

bloguetronica

Joined Apr 27, 2007
1,359
Hi,
We need voltage convertion from 5 volts to 3.3 volts( TTL compatible).
For this can i use a tristate buffer ( supply =3.3V, input voltage range is -.5 to 5.5 volts, o/p is TTL compatible) in place of a level shifter( Vcc=3.3).


Q1. In the datasheet of tristate buffer he specified currents for logic 1 and logic 0 as
logic '1' output current -20 mA
logic '0' output current +20 mA

Is this same for all tristate buffers?
When we connect some component at the o/p of that tristatebuffer what are the issues I have to take care about?


thanks
sharath
Where is the datasheet? Are you refering to open collector outputs? You can use those for that.

I sense a confusion between tristate gates and open collector outputs in this forum.:D
 

lightingman

Joined Apr 19, 2007
374
There are a range of gates that will do this.... 74LCXxxx series.They will run at 3.3v VDD, but have 5v tolerant inputs.Or check out the CD40109.Daniel.
 
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