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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Calculate the range of daatsheet for this resistor. Measure both the input voltage and the logic output of the inverter. What is the difference between open collector, tri-state and totem-pole outputs? To present basic characteristic and limitations of gates. To give students a sense of the magnitudes of voltage, current, resistance, capacitance, time, frequency, etc.
Open-Collector Output Figure datashdet. Digital IC manufacturers are continually trying to minimize the delay-power product and continue to produce families with different characteristics to suit specific needs.
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Study the feedback circuits shown and use the oscilloscope to examine the signal at different stages in the circuit. Outputs of several open-collector gates may be directly wired together to form a wired-OR logic function for negative logic. In other words, when Q3 is closed, Q4 is open.
Bus drivers with tri-state outputs are connected together to create a bus system. The following table is a growing list of various sub-families with their characteristics and designations. An unconnected input is said to be floating.
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.
How is the frequency affected by values of R and Dztasheet What is meant by tri-state or 3-state outputs? Problem 7 – Schmitt trigger oscillator Construct this simple oscillator and measure the frequency of oscillation for a given R and C.
(PDF) 74AS00 Datasheet PDF Download – Quadruple 2-Input Positive-NAND Gates
Conversely, when Q3 is open, Q4 is closed. At any time, only one of datasheet two switches is closed while the other is open.
What is the maximum current flowing through the outputs in c? Only one driver must be enabled at any time otherwise a conflict will occur.
What is the lowest value of R such that the output is still HI?
Where would you use ddatasheet latter instead of the former? Families can be characterized by the relationship between propagation-delay and power. 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. The voltage at the output pin is indeterminate and is said to be floating.
What is the meaning of hysteresis?
(PDF) 74AS00 Datasheet download
Problem 3 – Input Currents The inputs of logic gates present loads within a circuit. In this diagram, observe that the output stage consists of two active elements, Q3 and Q4. What is the input hysteresis in volts for these two gates? An open-collector output has current sinking capabilities, that is, it can present a logic-LO output. In order for outputs to present a logic LO they have to 74xs00 current-sinking capabilities. Also shown in Figure 6.
What is the smallest value of R such that the output is still LO?
What are the criteria for determining the value of the pull-up resistor for an open collector output? Another common structure datasgeet CMOS complementary metal-oxide-silicon technology which exhibits low power and high noise immunity. In order to put into perspective where the above devices fit into the scheme of things and how far we have come, it would be instructive to look at a chronology of computer electronics.
The first two conditions show the normal totem-pole operation. What is the diference between a inverter and a Schmitt trigger? 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. Datashret this input constitute a logic LO or logic HI input? Let us examine the typical totem-pole output once again.
Within the TTL family, there are many datashert families, each with different operating characteristics.
This third state is a useful feature and is employed in tri-state outputs as another way of creating party-line bus systems. Datasheer is the minimum and maximum frequency of oscillation? All simulation and debugging is conducted on the computer before the chip is created. What happens when the outputs of two totem-pole outputs are connected together?