Connecting GPIO to TTL

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Connecting GPIO to TTL

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lpcware
NXP Employee
NXP Employee
Content originally posted in LPCWare by fi1953 on Thu Apr 14 02:38:05 MST 2011
If I connect an LPC1114 GPIO  (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  ?
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lpcware
NXP Employee
NXP Employee
Content originally posted in LPCWare by Ex-Zero on Thu Apr 14 09:00:10 MST 2011
On-chip pull-up/pull-down resistors are weak, so I wouldn't switch them off.

TTL fanout is strong enough to drive them.
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