Logic circuits or clock mode Fundamental Pulse mode FIGURE 81.15 Graphic classification of logic circuits (Ideal components. hat is, no delays F2=#F31号::12=F2:2 Fm = Fm(1, 12,..., In) fm=Fm after Atm FIGURE 81.16 Block diagram model for combinational logic circuits. The logic elements can be anything from relays with their slow on and off switching action to modern off- the-shelf integrated circuit(IC) transistor switches with their extremely fast switching action. Modern ICs exist in various technologies and circuit configurations such as transistor-transistor logic(TTL), complementary metal-oxide semiconductor(CMOS), emitter-coupled logic (ECL), and integrated injection logic(FL), just to lame a The delays in the outputs of the model in Fig. 81.16 represent lumped delays, that is, worst-case dela through the longest delay path from the inputs to each respective output of the combinational logic circuit. e 2000 by CRC Press LLC© 2000 by CRC Press LLC The logic elements can be anything from relays with their slow on and off switching action to modern off￾the-shelf integrated circuit (IC) transistor switches with their extremely fast switching action. Modern ICs exist in various technologies and circuit configurations such as transistor-transistor logic (TTL), complementary metal-oxide semiconductor (CMOS), emitter-coupled logic (ECL), and integrated injection logic (I2 L), just to name a few. The delays in the outputs of the model in Fig. 81.16 represent lumped delays, that is, worst-case delays through the longest delay path from the inputs to each respective output of the combinational logic circuit. FIGURE 81.15 Graphic classification of logic circuits. FIGURE 81.16 Block diagram model for combinational logic circuits