# 74L00 DATASHEET PDF

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An open-collector output has current sinking capabilities, that is, it can present a logic-LO output.

### 4D6 Lab Manual – Chapter 6

Power is the rate of energy production or consumption. The designer may have to search for minimum and maximum delays. Connect the ammeter between the power supply and the chip to monitor ICC.

Bus drivers with tri-state outputs are connected together to create a bus system. In another, the excess base charge may flow out through the resistor RB. A good analogy to this is the pull-cord on a city bus which datasheft pulls when requesting the driver to stop. Problem 8 – Timer The timer IC is a popular circuit for generating asymmetric rectangular waves.

This is called the high impedance or Hi-Z state. Analyze the circuits and explain the results.

### 54L00/74L00 datasheet & applicatoin notes – Datasheet Archive

We also look at the relationship between power consumption and switching speed. It can be measured or calculated for a hardware system with various data paths. In commercial ECL families 10K is the most popular the power supply is actually Below the formula for power in terms of current and voltage is developed. The good news about saturation is that it lowers the collector-to-emitter voltage-which represents logical LOW-to about 0.

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## 7400 / 74xxx TTL Series ICs

Some chips, particularly display drivers like themay get hot to the touch because they’re consuming a lot of power for their small size, sending current out to display segments-an “8” signal should feel hotter than a “1. Where would you use the latter instead of the former? If you inspect data sheets of chips from different logic families, you’ll find that switching speed increase is generally accompanied by an increase in current delivered to the chip.

All other things being equal, shorter connections will make for a faster circuit. Why is negative logic commonly used? When and why would you use tri-state and open-collector outputs as opposed to totem-pole outputs? It would seem that purveyors of a new technology, such as GaAs, would consider implementation in general-purpose “gate arrays” to finesse the problem of manufacturing the hundreds of standard chips needed to compete with established families of TTL and CMOS.

ECL is a non-saturating type of silicon bipolar design. The tri-state bus driver has an enable input G. Observe here that the circuit elements associated with Q4 in the totem-pole circuit are missing and the collector of Q3 is left open-circuited, hence the name open-collector. When a CMOS inverter switches, there is a brief time when charge can flow through both transistors. What is the lowest value of R such that the output is still HI?

Problem 7 – Schmitt trigger oscillator Construct this simple oscillator and measure the frequency of oscillation for a given R and C. After a central processing unit CPU upgrade in the RT could load the same benchmark program in 30 seconds. For CMOS gates dynamic power dissipation is the main form of power dissipation; power consumed by a CMOS chip is almost linear with frequency of switching.

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The marketplace has provided an environment for a struggle between different versions of logic chips.

The region can be modeled by a parasitic junction capacitance, shown in the figure below. Because of low power consumption and tolerance of power supply voltage, CMOS is favored in consumer electronics powered with batteries, such as digital watches where, also, low-power liquid crystal displays are favored over LED’s. On the right above is shown the emitter-coupling which is the basic building block of ECL; current through either transistor will create a voltage drop across Rem.

What is the voltage range that would be considered a logic LO? Integrated circuits are not based on carbon because carbon is not easily turned into crystalline form. Great care must be taken with the construction of ECL circuits operating near their maximum clock rates; for example, ordinary wires connecting chip outputs and inputs must be less than 10 cm, or be made as terminated transmission lines, to avoid spurious ringing.

Keeping transistors out of saturation decreases propagation delay and minimizes amount of switching noise generated. Power can either be generated or consumed by a system. The CMOS front end results in high input impedance and good noise margin, and high fanout. In some cases it’s possible to combine both technologies in a single chip: