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Ttl and cmos logic families pdf: >> http://hqp.cloudz.pw/download?file=ttl+and+cmos+logic+families+pdf << (Download)
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29/09/2005. EE6471 (KR). 121. – Digital Logic Voltage and Current Parameters. • Fan-out, Noise Margin, Propagation Delay. – TTL Logic Family. – TTL Logic Family Evolution. – ECL. – CMOS Logic Families and Evolution. – Logic Family Overview. Logic Families/Objectives
The fanout of a logic gate is the number of inputs that the gate can drive without exceeding its worst-case loading specifications. • Fanout must be examined for both possible output states. • TTL input or output lead is defined to be positive if the current actually flows into the lead, and negative if the current flows out of the
Resistor-Transistor logic (RTL). ?. Diode-Transistor logic (DTL). ?. Emitter coupled logic (ECL). ? Logic families can be classified broadly according to the technologies they are built with. ?. Emitter coupled logic (ECL). ?. Transistor-Transistor logic (TTL). ?. CMOS logic. ? TTL and CMOS logic family is most widely used IC.
Operated in emitter coupled geometry (recall differential amplifier or emitter-follower), transistors are biased and operate near their Q-point (never near saturation!) • Logic levels. “0": –1.7V. “1": –0.8V. • Such strange logic levels require extra effort when interfacing to TTL/CMOS logic families. • Open LTspice example: ECL
Syllabus. • Digital Logic families. • Characteristics of digital circuits: – fan in, fan-out, power dissipation, propagation delay, noise margin;. • Transistor-transistor The most widely used families are: – transistor-transistor logic (TTL). – emitter-coupled logic (ECL). – complementary metal oxide semiconductor. (CMOS). 25.3
These families vary by speed, power consumption, cost, voltage & current levels. • IC digital logic families. – DL (Diode- logic). – DTL. (Diode-transistor logic). – RTL. (Resistor-transistor logic). – TTL. (Transistor -transistor logic). – ECL. (Emitter-coupled logic). – MOS (Metal-oxide semiconductor). – CMOS (Complementary
11 Aug 2014 PDF generated using the open source mwlib toolkit. "building block" logic gate ICs are based on the ECL, TTL, CMOS, and BiCMOS families. RTL . original TTL). Other CMOS families. Other CMOS circuit families within integrated circuits include cascode voltage switch logic (CVSL) and pass transistor
Out of the logic families mentioned above, DL, RTL and DTL are not very useful due to some inherent disadvantages while TTL, ECL and CMOS are widely used in many digital circuit design applications. Each logic family is further classified based on the significant variation in the key parameters. This helps in improving
Logic families (TTL, CMOS). When you work with digital IC's, you should be familiar, not only with their logical operation, but also with such operational properties as voltage levels, noise immunity, power dissipation, fan-out, and propagation delays. DC Supply Voltage. The nominal value of the dc supply voltage for TTL
Dynamic memory. Light on. Light off. Fiber optics. 2-5V. 0-0.8V. Transistor-transistor logic. 3.5-5V. 0-1.5V. CMOS logic. Circuit closed. Circuit open. Relay logic. 1. 0 CMOS features. • CMOS families: – 4000 series. – 7400 series: • 74HC (high-speed CMOS),. • 74HCT(High-speed CMOS, TTL compatible). • 74AC(Avanced
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