The TSC80C31/80C51 is a high performance SCMOS version of the 8051 NMOS single chip 8 bit µC. It retains all the features of the 8051, and has two software-selectable modes of reduced activity for further reduction in power consumption. The TSC80C31/80C51 is manufactured using SCMOS process which allows them to run from 0 up to 44 MHz with VCC = 5 V. The TSC80C31/80C51 is also available at 20 MHz with 2.7 V < Vcc < 5.5 V.