https://community.nxp.com/t5/LPCXpresso-IDE/Connecting-GPIO-to-TTL/m-p/577993#M23433 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by fi1953 on Thu Apr 14 02:38:05 MST 2011</STRONG><BR /><SPAN>If I connect an LPC1114 GPIO&nbsp; (either as Output or Input) to a TTL gate , do I have to disable the pull-up and/or pull down option of the GPIO&nbsp; ?</SPAN></BODY></HTML> Wed, 15 Jun 2016 22:38:34 GMT lpcware 2016-06-15T22:38:34Z https://community.nxp.com/t5/LPCXpresso-IDE/Connecting-GPIO-to-TTL/m-p/577993#M23433 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by fi1953 on Thu Apr 14 02:38:05 MST 2011</STRONG><BR /><SPAN>If I connect an LPC1114 GPIO&nbsp; (either as Output or Input) to a TTL gate , do I have to disable the pull-up and/or pull down option of the GPIO&nbsp; ?</SPAN></BODY></HTML> Wed, 15 Jun 2016 22:38:34 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Connecting-GPIO-to-TTL/m-p/577993#M23433 lpcware 2016-06-15T22:38:34Z https://community.nxp.com/t5/LPCXpresso-IDE/Connecting-GPIO-to-TTL/m-p/577994#M23434 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Ex-Zero on Thu Apr 14 09:00:10 MST 2011</STRONG><BR /><SPAN>On-chip pull-up/pull-down resistors are weak, so I wouldn't switch them off.</SPAN><BR /><BR /><SPAN>TTL fanout is strong enough to drive them.</SPAN></BODY></HTML> Wed, 15 Jun 2016 22:38:34 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Connecting-GPIO-to-TTL/m-p/577994#M23434 lpcware 2016-06-15T22:38:34Z