74AS00 Quad 2-Input NAND Gate. Physical Dimensions inches (millimeters) unless otherwise noted (Continued). Lead Plastic Dual-In-Line Package ( PDIP). 74AS00 Datasheet, 74AS00 PDF, 74AS00 Data sheet, 74AS00 manual, 74AS00 pdf, 74AS00, datenblatt, Electronics 74AS00, alldatasheet, free, datasheet. description. These devices contain four independent 2-input positive-NAND gates. They perform the Boolean functions Y = A • B or Y = A + B in positive logic.
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What happens when the outputs of two totem-pole outputs are connected together? What ddatasheet the minimum and maximum frequency of oscillation? This is called the high impedance or Hi-Z state.
Open-Collector Output Figure 6. The first two conditions show the normal totem-pole operation.
Families can be characterized by the relationship between propagation-delay and power. Within the TTL family, there are many second-generation families, each with different operating characteristics. At any time, only one of the two switches is closed while the other is open.
Use a 1K potentiometer datashset supply a variable input voltage.
This configuration with Q4 stacked on top of Q3 is referred to as datasbeet totem-pole output. Another common structure is CMOS complementary metal-oxide-silicon technology which exhibits low power and high noise immunity.
Draw the input and output waveforms timing diagram. Two important factors in the consideration of each logic family are speed and power consumption.
4D6 Lab Manual – Chapter 6
Study the feedback circuits shown and use the oscilloscope to examine the signal at different stages in the circuit. 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. Bus drivers with tri-state outputs are connected together to create a bus system. Why is negative logic commonly used? To present basic characteristic and limitations of gates.
This is useful for creating a party-line data bus or control bus whereby any one of several circuits may pull the line LO without causing damage to another active 74aw00.
Where would you use the latter instead of the former? All simulation and debugging is conducted on the computer before the chip is created. What is the meaning of hysteresis? The propagation delay inherent in gates can be useful for creating oscillatory circuits. An unconnected input is said to be floating.
Conversely, when Q3 is open, Q4 is closed. When G is LO, the output is in the high impedance state. Measure the voltage present at the input pin when no connection is made to it.
Does this input constitute a logic LO or logic HI input? Analyze the circuits and explain the results. What are the criteria for determining the value of the pull-up resistor for an open collector output? Regardless of the IC’s complexity or how it is created, basic knowledge of gates and flip-flops is still essential.
Also shown in Figure 6. What is meant by tri-state or 3-state outputs? Complex electronic circuits for high volume production are produced today using ASICs application specific ICs compiled entirely using a computer-aided design CAD system. Calculate the range of values for this resistor. What is the diference between a inverter and a Schmitt trigger? Let us examine the typical totem-pole output once again.
A good analogy to this is the pull-cord on a city bus which one pulls when requesting the driver to stop. Construct the circuit shown and study how the frequency and duty cycle are affected by R2 and C.
Problem 10 What is meant by negative logic? The chart shows the speed-power relationship of common TTL families.
(PDF) 74AS00 Datasheet download
Problem 7 – Schmitt trigger oscillator Construct this simple oscillator and measure the frequency of oscillation for a daatasheet R and C.
In normal usage a logic-HI is provided by an external pull-up resistor as shown. What is the voltage range datasehet would be considered a logic LO? An open-collector output has current sinking capabilities, that is, it can present a logic-LO output. In contrast with a normal totem-pole output, it cannot be the source of current and therefore cannot present a logic-HI on its own.
Problem 8 – Timer The timer IC is a popular circuit for generating asymmetric rectangular waves.
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What is the minimum and maximum values of R and C? This third state is a useful feature and is employed in tri-state outputs as another way of creating party-line bus systems. Digital IC manufacturers are continually trying to minimize the delay-power product and continue to produce families with different characteristics to suit specific needs. In this diagram, observe that the output stage consists of two active elements, Q3 and Q4.
To give datashee a sense of the magnitudes of voltage, current, resistance, capacitance, time, frequency, etc. How is the frequency affected by values of R and C? These loads are characterized as input currents and will differ depending on whether the input logic level is LO or HI.
The tri-state bus driver has an enable input G. When and why would you use tri-state and open-collector outputs as opposed to totem-pole outputs?