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7-Segment Display Guide

The document discusses using a 7447 7-segment driver to display numbers on a display. It describes how the 7447 uses RBI and RBO pins to blank the display when all inputs are zeroes instead of displaying a 0. It also discusses using a 7490 binary counter instead of switches to generate and sequence numbers to two 7447 displays to show a 2-digit number from 0 to 99. The assignment is to design a 3-digit counter that can count from 0 to 999, blanking leading zeroes so 2 is displayed as 2, not 002.

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khaled lotees
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112 views9 pages

7-Segment Display Guide

The document discusses using a 7447 7-segment driver to display numbers on a display. It describes how the 7447 uses RBI and RBO pins to blank the display when all inputs are zeroes instead of displaying a 0. It also discusses using a 7490 binary counter instead of switches to generate and sequence numbers to two 7447 displays to show a 2-digit number from 0 to 99. The assignment is to design a 3-digit counter that can count from 0 to 999, blanking leading zeroes so 2 is displayed as 2, not 002.

Uploaded by

khaled lotees
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Using 7447, the 7-segment driver (decoder)

• LT: Light Test control, Active low, turns all segments on


• BI/RBO: blanking input (BI) or ripple-blanking output (RBO)
• Blanks all the segments when active,
• Active low
• Generating numbers using switches
RBI and RBO
• This configuration is used to blank the display when all the inputs are
zeroes instead of displaying 0 on the display

0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1
RBI RBI RBI RBI
7447 7447 7447 7447
RBO RBO RBO RBO
Using 7490 instead of switches
Displaying 2-digit number
• The clock of the 7490
of the units digit is
connected to a switch 7447 7447

normally,
• the clock of the tens
digit is connected to
the D output of the
7490 of the units digit.
Displaying 2 Displaying 13
Assignment
• Design a 3-digit counter that can display numbers from 0 to 999
• Make sure that zeroes to the left will be blank not displayed as zeroes
• For example, the number two is displayed as 2 not 002

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