The 920/921/922/9221 "sub-family" is popular. My guess is that the AT2051 is also popular. Philips does still build the LPC76x family which are low pin count 5V parts. The goal for the LPC900 was not to build a single device to try to compete against a specific part from a competitor. We wanted to offer a really good solution for the "low-end" of the microcontroller market, which also tends to be the most cost sensitive. The goal was to build a family of 80C51-based devices with the most peripherals crammed in there, at the lowest cost, and have power consumption that made battery use possible. In order to get the lowest cost, you need the smallest die area, which means you need to use fab processes with small geometeries. The nature of the smaller processes are that they don't have the dielectric strength on the normal transistors to withstand 5V on their gates. There were some special things that the designers had to do to get 5V tolerant I/O pins. I don't recall all the details and I 'd need to go ask on the the chip designers to find out. But I do recall that the extra circutry makes the I/O cells a bit larger. We could have used a 5V process instead of a 3V process but the die would be significantly bigger, would cost more, draw a lot more power, and be slower. We did give you 5V tolerant I/O so that you could use the part to interface with 5V-based parts. In the LPC900 family we have offered, for your consideration, parts in 8, 10, 14, 16, 20, and 28-pin packages, and soon, 40+ pins, with a mixture of different peripherals. Hopefully, we have built a family that will be able to meet most of your application needs.