TTL with Better Noise Immunity
Original Publication Date: 1980-Mar-01
Included in the Prior Art Database: 2005-Feb-13
The down-level noise tolerance of conventional circuits, as shown in Fig. 1, is low. The output device T(2) in Fig. 1 will turn on when E noise approx. equal to V(be) - 0.4 V. This is a serious problem at higher temperatures, when V(be) is low.