Lpc2000

Hi Gus,

  I just currently designed a LPC2138 part with a ICL3222ECPN running
at 5VDC and have no problems with speeds up to 115.2K. I do have a 51
ohm series resistor on all I/O lines including the RXD and TXD of
USART0 to make sure that no EMI problems occur.

regards,
Charles


--- In lpc2000@yahoogroups.com, "Gus" <gus_is_working@y...> wrote:
>
> On my board I have LPC2138 connected to MAX232 running at 5V. I had 
> problems with UART until I added a 4.7K resistor in series. and the 
> voltage high on it now is 2.3V
> 
> Are the pins real 5V tolerant? The data sheet says UART RX is 5V 
> tolerant!!!
> 
> Thanks in advance
> 
> Gus
>