BCD to. 7-Segment. Decoder. January DM74LS BCD to 7-Segment Decoder. General Description . This datasheet has been downloaded from: www. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder. The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display.

Author: Viran Vizilkree
Country: Zimbabwe
Language: English (Spanish)
Genre: Technology
Published (Last): 12 March 2012
Pages: 59
PDF File Size: 12.11 Mb
ePub File Size: 13.54 Mb
ISBN: 569-6-63779-511-9
Downloads: 17579
Price: Free* [*Free Regsitration Required]
Uploader: Mishakar

It was designed to sink current when using datashset anode 7-segments LED. Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A.

What is the purpose of students taking your course? While this question introduces the concept of a vacuum-fluorescent VF display, it also serves as a review of shift register and latch technology. Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. It is usually necessary to have more than one display digit for a digital system.

All segments are extinguished when a low logical zero signal is applied to pin 4 OUT. The MM high-voltage display driver IC from National Semiconductor serves as an interface between either a microprocessor or microcontroller and a high-voltage vacuum datzsheet VF display panel.

An interesting feature of this IC is that it receives the 20 bits of data serially one at a timethrough a single input pin:. Is IC power required? Liquid crystal display LCD elements require the application of AC voltage rather than DC voltage to prevent certain undesirable effects. Nov 20, 8. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.


Shown above, is an example application of the 74LS48 7-seg decoder circuit.

7447 IC is wierd!

Nathan Hale likes this. Apr 28, 1, If you’re kind enough to send me your address I can send you some. Both students connect their ICs to common-cathode 7-segment displays as such: I’ve connected a decoder to 7-segment display as shown in figure. One of the points of this question is for students to realize that bigger groups are better, in that they yield simpler SOP terms.

Pin 5 should go to GND. However, if pins are limited on the microcontroller, it can be advantageous to use ICs in a multiplexing fashion to drive the 7-segment displays.

74LS48 BCD to 7-segment Decoder Driver IC | Warefab

Quote of the day. Nov datqsheet, 1. They also need real, hands-on practice building circuits and using test equipment. Truth be known, I chose a pretty bad example to try to make an SOP expression from, since there are only two non-zero output conditions out of ten!

Another time-saving technique is to re-use the same components in a variety of different circuit configurations.

Spehro Pefhany k 4 A friend of yours is trying to build his own Nixie tube display circuit, but is experiencing problems.

I might have some or chips laying around let me see though While this approach makes students proficient in circuit theory, it fails to fully educate them.


I am sure the guys who made this IC knew what they were doing, but my question is why are the outputs exactly opposite of what you would expect. Being cautious, your friend decides to connect just one of the Nixie tube digits to a transistor, and then to theto see if the idea works before connecting all ten.

Nov 20, 3. In this particular case, with three 7-segment displays, we would need to use twelve output pins on the microcontroller for the three BCD numbers:.

This package accepts a positive-logic Binary Coded Decimal BCD input and converts it to dwcoder proper pattern necessary to illuminate a datadheet segment display. What is the purpose of a seven-segment decoder circuit?

74LS48 Datasheet

It merely conditions and outputs bits of information to the grids of a VF display. When you connect the LED, the leg that is normally connected to ground should be connected to thethe leg that is normally connected to voltage source should be connected to voltage source.

Nov 20, 4. If I am reading it right.

A seven segment decoder is datasyeet digital circuit designed to drive a very common type of digital display device: What IC is this? Learning to analyze digital circuits requires much study and practice.