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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.

In the process it is necessary to compare various semiconductor versions of logic gates. A small amount of delay in signal transmission is unavoidable because of the finite speed of light, which travels one foot per nanosecond signals move in wire at nearly the speed of light.

Series TTL ICs.

The question to answer: Calculate the range of values for this resistor. When a bipolar transistor-inverter is ON sufficient base current can “saturate” the device and fill its base region with electrons. The short answer is CMOS. While there may have been some advances in the CPU’s “architecture”-notably more parallel processing and better direct memory access DMA -a major improvement was in the shorter propagation delays of individual gates and chips.

Two important factors in the consideration of each logic family are speed and power consumption. Because heat degrades the performance of an IC, and enough heat can burn it out, cooling systems must be installed where too much heat will be generated. Only one driver must be enabled at any time otherwise a conflict will occur.

74L00 TTL datasheet & applicatoin notes – Datasheet Archive

We see what virtues the survivors possess-chief among these are fast switching speed, low power consumption, high packing density and reasonable cost per gate. The result is a hybrid logic family with good packing density, low power consumption, and excellent speed.


The diagram below shows the voltage and current conventions for positive power absorbed by a resistor: Besides digital, GaAs transistors have numerous applications in high speed analog design. Higher temperatures can cause chips to operate at slower speeds. In some cases it’s possible to combine both technologies in a single chip: This configuration with Q4 stacked on top of Q3 is referred to as a totem-pole output. The CMOS front end results in high input impedance and good noise margin, and high fanout.

And shorter connections will have less loading capacitance. What is the difference between open collector, tri-state and totem-pole outputs? The previous Supplemental Chapter dealt with static parameters “DC characteristics” of voltage and current for digital chips. The tri-state bus driver has an enable input G.

Diamond IC’s would be faster and have better heat characteristics. Electrostatic-not heat- damage to CMOS can cause a filament of metal to blast through a junction, and thereby produce a local short circuit. If the unit is not plugged in, batteries will drain more quickly the more power consumed per chip.

A matter of noise margin. Gallium is in column III and arsenic in V. In commercial IC devices, however, aluminum is used as a metallization layer for routing of wire-like connections.

(PDF) 74L00 Datasheet download

Timing parameters for a 74 F 74 D flip flop are given below: To present basic characteristic and limitations of gates. Recall from mechanics that energy or work is force x distance. Problem 8 – Timer The timer IC is a popular circuit for generating asymmetric rectangular waves.

All other things being equal, shorter connections will make for a faster circuit. Power consumption in CMOS devices is proportional to switching frequency. Think of the heat generated by the muscles of the animals below. Review of work from Japan on the development of diamond p-n junction diode. As you may know, to compute power consumed in an electrical component, multiply voltage across the component times current flowing through.


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. Also shown in Figure 6. In CMOS is the most widely used digital logic process.

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. These chips come at considerable cost in power consumption and ease of interface to other logic families. Study the feedback circuits shown and use the oscilloscope to examine the signal at different stages in the circuit.

CMOS is the preferred technology because of the ease with which many transistors can be placed on one IC, and because of the low power consumption of the resulting configuration. Also, no resistors are needed in the CMOS circuit, other than the resistances of the gates themselves. There’s not really much disruption of the semiconductor crystal structure from excess heat in chips.

7400 / 74xxx TTL Series ICs

A switching circuit interpretation is in b. With the power supply on the common emitter resister Rem, the circuit has more immunity to spikes on the power lines, and in fact ECL has vatasheet less problem than TTL with switching spikes, since ECL current magnitudes do not change during transitions. What is the range that would be considered a logic HI? The idea will remind you of an analog differential amplifier.