Gates or IC to use to convert 1x 4 bit 2x 4 bit

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    Bit Convert Ic
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Discussion Overview

The discussion revolves around the challenge of converting a 4 or 5 bit binary input into separate binary outputs for display on 2x 7-segment displays. Participants explore various circuit options and components that could achieve this separation.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant suggests using a binary to BCD decoder, specifically mentioning the 74LS/HC/HCT185 IC as a potential solution.
  • Another participant clarifies the intent to separate two binary digits from a 4 or 5 bit binary input for display purposes.
  • A further response explains that BCD is equivalent to binary for values 0-9 and can be decoded using a 74185 chip, which can handle up to 6 bits of binary to produce 2 digits of BCD.
  • Additional alternatives are proposed, including using microcontrollers, programmable logic chips, LEDs for binary reading, or BCD-7 segment decoders for specific inputs.

Areas of Agreement / Disagreement

Participants present multiple competing views on the best approach to achieve the desired output, with no consensus reached on a single solution.

Contextual Notes

Some limitations include the availability of specific ICs mentioned and the need for additional components like BCD-7 segment decoder/drivers for complete functionality.

Who May Find This Useful

Individuals interested in digital circuit design, binary encoding, and display technologies may find this discussion relevant.

chrisalviola
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example 1111 = 15 is there a circuit to separate output binaries 0001(1) and 0101(5) in input 1111(15)?
 
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A binary to BCD decoder does what you want. There were the 74LS/HC/HCT185 ICs, but it might be difficult to get one today.
 
my question was to separate 2 binary digits out of the 4 or 5 bit binary. to display it using 2x 7 segment
 
Binary Coded Decimal (BCD) is the same as binary for 0-9, but then it carries to 10 and not to 0A. So this is exactly what you want. A single 74185 chip will decode up to 6 bits of binary to 2 digits of BCD.
(You have to add one or two BCD-7segment decoder/drivers)

Of course you could use a microcontroller or a programmable logic chip, as discussed http://www.electronics-related.com/usenet/basics/show/29703-1.php.

Other alternatives:
- simply use 5 Leds and learn to read binary
- use a BCD-7seg decoder/driver with defined output for input a-f and learn to read this (74247, iirc)
- two digit octal display with two standard BCD-7seg decoder/drivers
 

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