There is no pin-replacement of an NE555, but there are many timer functions available in a PSoC4. Apart from the analog original you will specify the duration in a PSoC4 using digital values with precisions in µs range.
I would suggest you to download and install Cypress Creator software version 3.1 or 3.2 and open one of the example projects for PSoC4. In the schematic view you can stroll through all the components and with a mouseclich you will get a datasheet full of informations, example projects etc.
If you wanted to emulate a 555 timer here is a PSOC 1 project
which you shopuld be able to port to PSOC 4 -
The basic circuit functionality of a 55 timer can also be done with
a comparator, cap, Open Drain output to discharge cap, a ref for the
comparator or use a VDAC.....
Or just use the SAR monitoring a pin with some code to compare
to desired trip levels and generate logic equivalent of 555 comparator........
Thank you Dana and Bob for the excellent information. I will post back once I get this up and running-
Glad to have been of assistance.