Lpc2000

First of all, the 3.3 volt output will usually drive the 5 volt input,
but with reduced noise margin, since the switching threshold for CMOS
running on 5 volts is about 2.5 volts.

An easy way to go from 3.3 volts to 5 volts is to use a 74HCT08, NOT
74HC08. The input threshold on 'HCT is about 1.5 volts, and the output,
if supplied with 5 volts, is of course 5 volts.


At 02:45 AM 12/11/2004, you wrote:

>Hello...
>
>Unfortunately I cannot obtain any RS232 Driver for 3.3V, yes for 5V.
>In My LPC board I have 5V, so I was thinking about adding some
>transistor and convert the 3.3V from the LPC2106 to 5V and viceversa
>for the RX pin. I know this is not the best solution, but I think it
>could work. If not, what about making a Level shifter with
>Transistors? Does anybody have a schematic, or can help me with this?
>Thanks
>Ezequiel
>
>
>
>
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