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Logic

Logic

Logic forum

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Texas Instruments (TI) Logic support forum is an extensive online knowledge base where millions of technical questions and solutions are available 24/7. You can search logic IC content or ask technical support questions on everything from voltage level translation and transceivers to standard logic gates and specialty logic devices. Find the right solution for your circuit design challenges by using our TI E2E™ support forums that are supported by thousands of contributing TI experts.
Frequent questions
  • [FAQ] How does a monostable multivibrator (one shot) work?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Monostable Multivibrators >> Current FAQ The above functional block diagram shows generally how a monostable multivibrator (MMV, or one-shot) works. Not all of them have every part shown, but this is the most common…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What's the difference between TTL and 5V CMOS logic?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ It's very common for people to refer to "TTL logic" and to actually mean "5V logic" -- but how are they different? The key difference is in the input and output voltages. This graphic…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference in timing between gates in the same device? How much skew is expected within a given logic device? What is the part-to-part skew?

    Karan Kotadia
    Karan Kotadia
    FAQ: Logic and Voltage Translation > Timing Parameters >> Current FAQ The difference in delay between the individual channels on an individual part is referred to as channel-to-channel skew or output skew. This is typically not covered as a datasheet…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference between the SN74HCxx and the SN74HCxxA?

    Emrys Maier
    Emrys Maier
    Other Parts Discussed in Thread: SN7400 , SN74LS00 FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ The High-speed CMOS (HC) logic family was created as a direct replacement for older bipolar junction transistor based transistor…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What method is best used for estimating specification values between those given in the datasheet?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Input Parameters >> Current FAQ The most common example of this question comes from the fact that Standard Logic devices are specified at 1.65V, 3V, and 4.5V, however most engineers use our devices at 1.8V, 3.3V…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] When will TI End of Life (EOL) or Obsolete a certain logic device?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Quality and Manufacturing >> Current FAQ TI's General Quality Guideline (page 7) describes our official policy on obsoleting a device. This policy is summarized below. TI's Product withdrawal/discontinuance process…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What are the power sequencing requirements for the translation device?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Voltage Translators >> Current FAQ Some of the TI translators have requirements during normal operation mode to have Vcca <= Vccb ( TXS/ TXB01xx) or Vrefb>= VrefA+0.8V(LSF). However, the TI translation devices do…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference between IOFF and VCC isolation? What are the conditions to guarantee it?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ The I OFF specification guarantees the I/O ports are in high impedance whenever either one of the power supply is at pulled to ground (0V) or close to gnd(<100mV as specified for the…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What should be done with unused I/O pins of the level translator devices?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Voltage Translators >> Current FAQ For the TXB family, unused I/O ports are recommended to be tied to GND through a weak pulldown resistors (>=100kohm). For TXS devices, the internal 10kohm pull-ups resistors will…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] Why is there no PSpice model for a Monostable Multivibrator device?

    Emrys Maier
    Emrys Maier
    Other Parts Discussed in Thread: SN74LVC1G123 FAQ: Logic and Voltage Translation > Monostable Multivibrators >> Current FAQ To make a long post short: MMVs cannot be directly simulated by PSpice because of their direct dependence on external components…
    • over 6 years ago
    • Logic
    • Logic forum
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  • Answered

    SN74AHC123A: Tw Design calculation and Observed output is not matching 0 Locked

    426 views
    2 replies
    Latest over 4 years ago
    by Sandeep NS
  • Answered

    TXB0104: current driving capacity 0 Locked

    307 views
    4 replies
    Latest over 4 years ago
    by Dylan Hubbard
  • Answered

    SN74LV245A: Maximum Input signal of SN74LV245APWR 0 Locked

    277 views
    2 replies
    Latest over 4 years ago
    by Yuto Kitamura
  • Answered

    SN74LVC2G17: Recommended rise time and fall time specification 0 Locked

    534 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Not Answered

    SN74LVC1T45: How to let the output from 0 down to -0.7v 0 Locked

    165 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Answered

    SN74AHC1G04: Pspice for TI model for this part generates simulation error 0 Locked

    458 views
    3 replies
    Latest over 4 years ago
    by Henri Girard
  • Answered

    LSF0108: Voltage Level Translator Bidirectional 1 Circuit 8 Channel 0 Locked

    470 views
    5 replies
    Latest over 4 years ago
    by Clemens Ladisch
  • Answered

    SN74HC257: Tj(max) for SN74HC257, CD74HC4075 and SN74HC86 0 Locked

    560 views
    5 replies
    Latest over 4 years ago
    by Emrys Maier
  • Suggested Answer

    SN54LVTH16244A: SN54LVTH16244A 0 Locked

    256 views
    1 reply
    Latest over 4 years ago
    by Rami Mooti1
  • Suggested Answer

    SN74LVC1G74: PRE=L CLR=L ,what will be the output Q? 0 Locked

    1321 views
    16 replies
    Latest over 4 years ago
    by Clemens Ladisch
  • Answered

    SN74HCS00: 74HCS gates' Cpd 0 Locked

    998 views
    1 reply
    Latest over 4 years ago
    by Emrys Maier
  • Suggested Answer

    SN74LXC8T245: Single channel bidirectional voltage translator with schmitt trigger input, direction control pin and can translate from 3.3V to 5V 0 Locked

    627 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Not Answered

    SN74LVC16T245: Thermal Shock 0 Locked

    570 views
    3 replies
    Latest over 4 years ago
    by Rami Mooti1
  • Suggested Answer

    SN74LVC2G17-EP: 5V Tolerant Schmitt trigger? 0 Locked

    689 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC2G17-EP: 5V tolerant? 0 Locked

    537 views
    1 reply
    Latest over 4 years ago
    by Rami Mooti1
  • Answered

    TXB-EVM: TXS-EVM 3D Files 0 Locked

    501 views
    2 replies
    Latest over 4 years ago
    by Carlo
  • Answered

    CD74HC4046A: Operation of CD74HC4046A phase comparator in MHz band 0 Locked

    1143 views
    6 replies
    Latest over 4 years ago
    by Emrys Maier
  • Answered

    TXB0101: Could TXB0101 use 3.3V supply when transfer 3.3V to 1.8V? 0 Locked

    629 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Suggested Answer

    SN74AHC1G08-Q1: schmitt trigger input 0 Locked

    485 views
    1 reply
    Latest over 4 years ago
    by Clemens Ladisch
  • Answered

    SN74LV595A: questions 0 Locked

    485 views
    4 replies
    Latest over 4 years ago
    by Clemens Ladisch
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