Shop/Components & Parts/IC’s/74 SERIES/74LS48 BCD to 7-segment Decoder Driver IC. The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display. Lamp test (LT\) of these types may be performed at any time when the BI\/RBO\ node is at a high. QEA. ACTIVE. CDIP. J. 1. TBD. A N / A for Pkg Type. to QE. A. SNJAJ. QFA. ACTIVE. CFP. W. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder.

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But for now Maythey are worthy of their own question in the Socratic Electronics project! When combined with a similar driver driving the anodes of the same VF display, individual pixels or combinations of pixels may be controlled lit.

Did he do anything wrong here? Would you like to decoodificador one of these unanswered questions instead? I’ve connected a decoder to 7-segment display as decodificaddor in figure. Select digit number 1 Output BCD code for digit number 1 Pause for very brief milliseconds amount of time Select digit number 2 Output BCD code for digit number 2 Pause for very brief milliseconds amount of time Select digit number 3 Output BCD code for digit number 3 Pause for very brief milliseconds amount of time Repeat cycle Follow-up question: Anyone who remembers the first LCD eecodificador on portable personal computers will recall how you could only see the display if you viewed it perpendicular to the display surface, or at a very slight angle from perpendicular.

Analyze the circuit, determining all output logic states for given input conditions. Home Questions Tags Users Unanswered.

For successful circuit-building exercises, follow these steps: This is standard and is shown in the SN datasheet:.

I have left the answer purposefully vague so that students will have to figure out how to properly use BJTs to drive the Nixie tube cathodes. Common cathodedatqsheet the negative connection of all of the LEDs is tied together.


An interesting feature of this IC is that it receives the 20 bits decodiificador data serially one at a timethrough a single input pin:. While this approach makes students proficient in circuit theory, it fails to fully educate them.

74LS48 Datasheet

What Decodificxdor want students to do is research datasheets on their own and be able to show where they got their information.

To see a list of open positions, click here. The student using the notices the LED segments glowing faintly, but the patterns are not correct for the digits that are supposed to be displayed. It merely conditions and outputs bits of information to the grids of a VF display.

Digital Display Circuits

One way you can save time and reduce the possibility of error is to begin with a very simple circuit and incrementally add components to increase its complexity after each analysis, rather than building a whole new circuit for each practice problem.

The block diagram should be informative enough for most students to be able to figure out at least an approximate procedure for loading and outputting data. There are many applications other than this where you need to get the microcontroller to output a certain combination of high and low states, and the fastest way to program this is to output hex values to the ports.

However, they don’t seem to mention that you need to have the inputs of the connected to something for it to work like you want it to. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.

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This question is destined for obsolescence, as Datasyeet displays will likely become a reality in the next several years. Paper is Lambertian in its reflective characteristics, which is one of the reasons it is so easy to read compared to contemporary digital display technologies.


Both students connect their ICs to common-cathode 7-segment displays as 7484 Thank you for your interest in this question. Simply wire the respective letters a. While this is good, there is a much better way. If it were not for the serial input, this IC would have quite a few more pins!

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The root of this question is little more than binary-to-hexadecimal conversion, but it also introduces students to the concept of controlling bit states in microcomputer ports by writing hex values. Engineering Program is accredited by: A real-life example such as this provides an excellent showcase for techniques such as Karnaugh mapping.

I never cease to be amazed at how poorly students grasp instructions when presented in a typical lecture instructor monologue format! Draw the schematic diagram for the digital circuit to be analyzed. Note that six of the cells are blank because the truth table does not list all the possible input decodifiicador with four variables A, B, C, and D. Describe what this feature is, and why it is used.

An interesting feature of this IC is that it receives the 20 bits of data serially one at a timethrough a single input pin: An obsolete display technology that still finds enthusiastic followers in the hobbyist world, called Nixie tubesrelies on a BCD-to decoder to drive one of ten different metal cathodes inside a neon-filled glass bulb.

Indeed, it just so happens that Exclusive-OR gates do the trick quite nicely: