Mohamed M. Texas Instruments introduced the series TTL family in Transistor—transistor logic uses bipolar transistors to form its integrated circuits. Since the transistors of a standard TTL gate are saturated switches, minority carrier storage time in each junction limits the switching speed of the device. Variations on the basic TTL design are intended to reduce these effects and improve speed, power consumption, or both.
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This solution might also apply to other similar products or applications. Solution Characteristics of CMOS logic: Dissipates low power: The power dissipation is dependent on the power supply voltage, frequency, output load, and input rise time. At 1 MHz and 50 pF load, the power dissipation is typically 10 nW per gate. Short propagation delays: Depending on the power supply, the propagation delays are usually around 25 nS to 50 nS.
Levels of the logic signal will be essentially equal to the power supplied since the input impedance is so high. Voltage levels range from 0 to Vcc where Vcc is typically 4. Voltage range 0V - 0. Voltage range 2V - Vcc creates logic level 1.
Lower current draw requires less power supply distribution, therefore causing a simpler and cheaper design. Due to longer rise and fall times, the transmission of digital signals becomes simpler and less expensive with CMOS chips. Related Links.
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