• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 21 subscribers
  • Views 244 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN74HC157: Higher output drive current version

Xiaoying Lu
Expert 4520 points

Part Number: SN74HC157

Hi team,

I notice that in datasheet, it shows that SN74HC157 has +/-6mA output drive capability at 5V. However, the continuous output current in EC table is +/-35mA? What's the specific difference between these two values?

If customer wants to select a higher output drive P/N which is higher than 20mA, other specs are the similar. What is your recommendation? My question is that in datasheet of other devices, there is no description on output drive current. Thanks!

BR/Xiaoying

  • 0
    TI__Mastermind 33185 points

    Hi Xiaoying,

    Output drive capability is related to maintaining valid logic levels at the output of the device. For example, the SN74HC157 is tested to be able to support 6mA of output drive current and still maintain almost 5V at the output at 5V VCC:

    Higher currents than 6mA from the output will result in larger voltage drops. You can drive a maximum of 35mA through a single pin without damaging it, but that output will likely not be at 5V/whatever your VCC is. Please let me know if this explanation makes sense.

    Our highest current drive family is the LVC family. You can look at this device, which is the same pinout and is rated up to 24mA: SNx4LVC157A Quadruple 2-Line to 1-Line Data Selectors/Multiplexers datasheet (Rev. S)

    Best,

    Malcolm