4 added 125 characters in body
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A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)?
  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

Let me add two (weak) arguments in favor of LS:

  • inputs can be left open (they will be high)
  • more robust against ESD

A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)?
  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)?
  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

Let me add two (weak) arguments in favor of LS:

  • inputs can be left open (they will be high)
  • more robust against ESD
3 added 2 characters in body
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A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)? the
  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)? the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)?
  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS
2 added 115 characters in body
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A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)? the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

A few arguments:

  • the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS

A few arguments:

  • with HC and HCT, the fan-out (at lower frequencies) is essentially unlimited, for LS it s IIRC 10 (or was it 20)? the HC and HCT families are newer than LS, so my bet would be that they will be around longer than LS
  • HC and HCT use much less current than LS (except maybe for a few gates that switch at a very high frequency), which eases the design and layout. HC and HCT also require much less power supply decoupling
  • check the logic levels, and choose the best match: HC or HCT. LS gives you only one option.
  • last time I checked, there was more choice in HC/HCT than in LS
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