I recommend always following the steps outlined below, with any component being considered for your designs:
1. Download ALL Component Datasheets, User Manuals, etc.
2. Carefully Study Each Datasheet, User Manual, etc.
3. Thoroughly Define and Specify Your Design Requirements.
4. Carefully Reexamine Relevant Datasheets, User Manuals, etc., to Answer Any Questions Which Should Arise
Certainly, if you have trouble finding or understanding a specification, asking for assistance is acceptable and encouraged. However, relying solely on the advice of others can often result in error.
NXP typically lists the relevant specifications, V
OH, V
OL, I
OH, I
OL, etc., pertaining to maximum output characteristics of an I/O pin in the Static Characteristics Section of the Specific Device Datasheet.
For example, Reference: LPC1110/11/12/13/14/15 Datasheet, Section: Static Characteristics, Page: 62, 63
There are also graphs following these tables which indicate the V
OH to I
OH and V
OL to I
OL relationships for an output pin along with temperature influences.
Other relevant information concerning proper I/O Pin configuration and modes can be found in the corresponding User Manual of the device family.
Similar sections exist in both the datasheets for LPC11U24 and LPC1343.
BigDog