• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 18 subscribers
  • Views 179 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

SN74HC257: Specification not shown in datasheet

Takeshi Sasaki
Expert 4480 points
Part Number: SN74HC257

Hi team,

Could you give me comment on following customer questions? I couldn't find spec in the datasheet for following parameters.

Q1. Could you tell me absolute maximum rating on VI and VO? It's assumed VCC +/- 0.5V or etc. 

Q2. Could you tell me absolute maximum rating on power dissipation (mW) or how to calculate it?

Q3. Could you tell me on typical and maximum rising time (tr) and falling time (tf)? The customer needs the data as the test condition of Ta=25C and Ta=-40~85C.

Q4. Could you tell me on typical and maximum input capacitance for /G pin and A/B pin? Is it the same with Ci in the datasheet?

Q5. Could you tell me on the output capacitance when the output pin goes Hi-Z?

Best regards,

Takeshi Sasaki

  • 0
    TI__Mastermind 42600 points

    Hey Takeshi,

    1. Yes, Vcc + 0.5V would be correct.

    2. This FAQ should answer this.

    3. These values are accounted for with tt spec in the switch char tables.

    4. Yes, this input capacitance applies to all inputs unless otherwise noted.

    5. I don't have exact numbers for this, but I would expect a few pF.