The LPC1227FBD64/301151 runs an ARM Cortex-M0 core at 45 MHz. The 128 KB Flash and 8K x 8 RAM give you room for a modest firmware image with a bootloader and a few communication stacks; if your application needs more than that, you're looking at a different density tier.
Supply voltage is 3V to 3.6V, so it runs from a single 3.3V rail common in mixed-signal designs.
