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 is the minimum and maximum frequency of oscillation? 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.
What is the input hysteresis in volts for these two gates? Calculate the range of values for this resistor. What is the diference between a inverter and a Schmitt trigger? In order for outputs to present a logic LO they have to have current-sinking capabilities. Measure both the input voltage and the logic output of the inverter.
The final chip may either be burned on the spot using a programmable logic array PLA or may be produced in higher volumes by the IC manufacturer. The voltage at the output pin is indeterminate and is said to be floating.
At 74qs00 time, only one of the two switches is closed while the other is open. What is the range that would be considered a daasheet HI? This third state is a useful feature and is employed in tri-state outputs as another way of creating party-line bus systems.
The first two conditions show the normal totem-pole operation. What is the smallest value of R such that the output is still LO?
In order to put into perspective where the above devices datasheett into the scheme of things and how far we have come, it would be instructive to look at a chronology of computer electronics. Be sure to measure the transfer function for both increasing as well as decreasing input voltages. The tri-state bus driver has an enable input G.
Why is negative logic commonly used? The propagation delay inherent in gates can be useful for creating oscillatory circuits. The chart shows the speed-power relationship of common TTL families. This configuration with Q4 datasehet on top of Q3 is referred to as a totem-pole output. Measure the voltage present at the input pin when no connection is made to it.
Digital IC manufacturers are continually trying to minimize the delay-power product and continue to produce families with different characteristics to suit specific needs. An open-collector output has current sinking capabilities, that is, it can present a logic-LO output. How is the frequency affected by values of R and C?
(PDF) 74AS00 Datasheet download
When G is LO, the output is in the high impedance state. Open-Collector Output Figure 6. Another common structure is CMOS complementary metal-oxide-silicon technology which exhibits low power and high noise immunity. Bus drivers with tri-state outputs are connected ddatasheet to create a bus system. Outputs of several open-collector gates may be directly wired together to form a wired-OR logic function for negative logic.
A good analogy to this is the pull-cord on a city bus which one pulls when requesting the driver to stop. Draw the input and output waveforms timing diagram. What datxsheet the difference between open collector, tri-state and totem-pole outputs?
Within the TTL family, there are many second-generation families, each with different operating characteristics. What is the lowest value of R such that the output is still HI? Two important factors in the consideration of each logic family are speed and power consumption. In other words, when Q3 is closed, Q4 datzsheet open. That is, from Ohm’s Law one talks about 1 dataxheet across 1 ohm produces 1 ampere.
Problem 11 – Monostable Multivibrator The circuit shows one-half of a 74LS dual “one-shot” monostable multivibrator being used to generate a pulse of adjustable width. Complex electronic circuits for high volume production are produced today using ASICs application specific ICs compiled entirely using a computer-aided design CAD system.
Use a 1K potentiometer to supply a 74ad00 input voltage. This is called the high impedance or Hi-Z state. When and why would you use tri-state and open-collector outputs as opposed to totem-pole outputs? The following table is a growing list of various sub-families with their characteristics and designations. What are the criteria for determining the value of the pull-up resistor for an open collector output? What is the minimum and maximum values of R and C?
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Where would you use the latter instead of the former? Using a very high frequency clock input measure the propagation delay of a typical 74xx or 74LSxx TTL gate. Let us examine the typical totem-pole output once again.
These loads are characterized as input currents and will differ depending on whether the input logic level is LO or Datasheey. In normal usage a logic-HI is provided by an external pull-up resistor as shown. Construct the circuit shown and study how the frequency and duty cycle are affected by R2 and C.
Regardless of the IC’s complexity or how it is created, basic knowledge of gates and flip-flops datasgeet still essential. 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 output.
Study the feedback circuits shown and use the oscilloscope to examine the signal at different stages in the circuit.
Conversely, when Q3 is open, Q4 is closed. Problem 10 What is meant by negative logic?