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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These loads are characterized as input currents and will differ depending on whether the input logic level is LO or HI. What is the meaning of hysteresis? Construct the circuit shown and study how the frequency and duty cycle are affected by Datashheet and C. When and why would you use tri-state and open-collector outputs as opposed to totem-pole outputs?

(PDF) 74AS00 Datasheet download

What is the difference between open collector, tri-state and totem-pole outputs? What are the criteria for determining the value of the pull-up resistor for an open collector output? All simulation and 74ws00 is conducted on the computer before the chip is created. In normal usage a logic-HI is provided by an external pull-up resistor as shown.

Problem 8 – Timer The timer IC is a popular circuit for generating asymmetric rectangular waves. A good analogy to this is the datashest on a city bus which one pulls when requesting the driver to stop.


Use a 1K potentiometer to supply a variable input voltage. The first two conditions show the normal totem-pole operation.

When G is LO, the output is in the high impedance state. What happens when the outputs of two totem-pole outputs are connected together?

The tri-state bus driver has an enable input G. If you examine a typical circuit board today you will find more use of large ICs with hundreds of pins and fewer style ICs. To give students a sense of the magnitudes of voltage, current, resistance, capacitance, time, frequency, etc.

Two important factors in the consideration of each logic family are speed and power consumption. In this diagram, observe that the output stage consists of two active elements, Q3 and Q4.

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. What is the voltage range that would be considered a logic LO?

What is the smallest value of R such that the output is still LO?

What is the range that would be considered a logic HI? Problem 10 What is meant by negative logic?

4D6 Lab Manual – Chapter 6

Study the feedback circuits shown and use the oscilloscope to examine the signal at vatasheet stages in the circuit. Regardless of the IC’s complexity or how it is created, basic knowledge of gates and flip-flops is still essential.


Construct and test this circuit. Problem 7 – Schmitt trigger oscillator Construct this simple oscillator and measure the frequency of oscillation for a given R and C. The voltage at the output pin is indeterminate and is said to be floating.

Does this input constitute a logic LO or logic HI input? This is called the high impedance or Hi-Z state. An unconnected input is said to be floating. 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 minimum and maximum frequency of oscillation?

Measure the voltage present at the input pin when no connection is made to it. This configuration with Q4 stacked on top of Q3 is referred to as a totem-pole 74ae00. The propagation delay 74aa00 in gates can be useful for creating oscillatory circuits.

Let us examine the typical totem-pole output once again. 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.