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???
02/04/10 12:18
Modified:
  02/04/10 12:18

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#172887 - LPC900 are 5V input tolerant
Responding to: ???'s previous message
5V input is no problem so lets talk about outputs.

drive 5V outputs
If you need to drive in to 4000 CMOS logic then perhaps you could add a 5V pull up resistor in the following operation.
a) Logic level low required - just drive the output low (there will be some current thu the pull-up)
b) Logic level low - turn the pin in to an input or Hi Z input and the 5V pull-up will sink current in to the 4000 CMOS etc.

Also some of the new LPC900 series Have Vdd up to 5V - ie the LPC9xx1 series.


Regards
Joseph


List of 12 messages in thread
TopicAuthorDate
5v Flash 8051 (low pin count)            01/01/70 00:00      
   NXP: LPC9xx?            01/01/70 00:00      
   Older?            01/01/70 00:00      
      WHY 5v???            01/01/70 00:00      
      Yes they have the M8 core            01/01/70 00:00      
   SiLabs Parts Can Interface 5V logic            01/01/70 00:00      
      re SILabs            01/01/70 00:00      
         SiLabs            01/01/70 00:00      
   LPC900 are 5V input tolerant            01/01/70 00:00      
      See App Note cited earlier            01/01/70 00:00      
      5-volt LP9xx1?            01/01/70 00:00      
   check also            01/01/70 00:00      

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