Once the enable pins are connected, then the input line can be connected for getting the output. In the above tabular form, the first rows namely G1, G2 are the enable pins required to be connected correctly otherwise irrespective of all i/p, as well as o/p lines, will be high. The enable pins G1, G2A, and G2B, where G2=G2A + G2B. In the above tabular form, the H-HIGH, L-LOW and X- don’t care. For a better understanding of this concept, let us understand the following truth table.
Here three buttons signify three i/p lines for this device. Here we have used a single device so the connections of G2A, as well as G2B pins, are connected to GND followed by linking G1-to-VCC for activating the chip. In the above circuit, the outputs are allied toward light emitting diode to illustrate which o/p-pin goes LOW & outputs of the IC are inverted. To understand the IC working, let us design a simple circuit with few required basic electronic components as shown below. Operating temperature is from -40✬ to +125✬.Integrates 3-enable pins for simplifying cascading.This IC is particularly designed for high-speed.The features of the 74LS138 IC include the following. The IC 74LS138 is a 16-pin integrated circuit, and each pin of this IC is discussed below. And also the inputs of this IC is clamped with Schottky diodeswhich are the high performance to contain line ringing as well as system design simplify. This IC is mainly used in de-multiplexingapplications with the help of an enable pin like a data input pin. The implementation of 24 line decoder can be done without using outside inverters, as well as a 32-line decoder needs a single inverter This IC includes three enable pins (where two pins are active low and one is active high) decreases the necessity of outside gates. These ICs can be used for minimizing the system decoding effects in memory systems with high performance. This IC is mainly used in applications like memory decoding with high performance otherwise data routing, etc.
The setup of this IC is accessible with 3-inputs to 8-output setup. The main function of this IC is to decode otherwise demultiplex the applications. The standard E3, E6, E12, E24, E48 and E96 resistor values are listed below.The IC 74LS138 is a 3 to 8 line decoder integrated circuit from the 74xx family of transistor-transistor-logic-gates.
Circuit coder test 3 series#
Standard Resistor Value Series and Tolerances
Resistors produced by different manufacturers are compatible for the same designs because of the use of standard values. This helps the supplier with stocking different values. The purpose of this was so that when companies produce resistors with different values of resistance, they would equally space on a logarithmic scale. Capactors, Zener diodes, and inductors also use these standards. These are referred to as preferred values or E-series, published in standard IEC 60063:1963. To make mass manufacturing of resistors easier, the IEC (International Electrotechnical Commision) defined tolerance and resistance values for resistors in 1952. Orange-Orange-Black-Brown-Violet Color CodeĪ resistor colored Orange-Orange-Black-Brown-Violet would be 3.3 kΩ with a tolerance of +/- 0.1%.Ī resistor colored Brown-Green-Grey-Silver-Red would be 1.58 Ω with a tolerance of +/- 2%.Ī resistor colored Blue-Brown-Green-Silver-Blue would be 6.15 Ω with a tolerance of +/- 0.25%.
Circuit coder test 3 code#
When you see only three color bands on a resistor, you know that it is actually a 4-band code with a blank (20%) tolerance band. The blank (20%) “band” is only used with the “4-band” code (3 colored bands + a blank “band”).Ī resistor colored Yellow-Violet-Orange-Gold would be 47 kΩ with a tolerance of +/- 5%.Ī resistor colored Green-Red-Gold-Silver would be 5.2 Ω with a tolerance of +/- 10%.Ī resistor colored White-Violet-Black would be 97 Ω with a tolerance of +/- 20%. All 5-band resistors use a colored tolerance band. The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only.
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