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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

    SN74AUP2G08: How much negative voltage can the input port withstand? 0 Locked

    319 views
    1 reply
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LS138: 74LS138 G1 Enable pin - pulldown recommendation? 0 Locked

    370 views
    2 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC2G00W-EP: VOL 0 Locked

    224 views
    1 reply
    Latest over 1 year ago
    by Malcolm Lyn
  • Suggested Answer

    SN74LVC2G07-EP: VOL 0 Locked

    256 views
    1 reply
    Latest over 1 year ago
    by Malcolm Lyn
  • Suggested Answer

    LSF0204: LSF0204PWR Single Supply Operation? 0 Locked

    320 views
    1 reply
    Latest over 1 year ago
    by Jack Guan
  • Suggested Answer

    TXS0108E: Application issues of chips 0 Locked

    373 views
    2 replies
    Latest over 1 year ago
    by Jack Guan
  • Suggested Answer

    TXS0104E: USB VBBUS Level Shifting 0 Locked

    414 views
    1 reply
    Latest over 1 year ago
    by Clemens Ladisch
  • Answered

    SN54LVC646A-SP: Vout,low,max at 20uA 0 Locked

    257 views
    2 replies
    Latest over 1 year ago
    by Sylvain Chuard
  • Answered

    SN74LVTH244A: Please let me know EAR number 0 Locked

    372 views
    1 reply
    Latest over 1 year ago
    by Motoyasu Hattori
  • Not Answered

    SN74AC244-Q1: Data sheet and website error 0 Locked

    196 views
    1 reply
    Latest over 1 year ago
    by Malcolm Lyn
  • Answered

    SN74LVC1G123: Delay length and jitter 0 Locked

    420 views
    6 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Not Answered

    SN74HCS574: Wrong chip picture for DGS package? 0 Locked

    236 views
    1 reply
    Latest over 1 year ago
    by Malcolm Lyn
  • Suggested Answer

    TXS0102-Q1: TXS0102QDCURQ1 pin to pin compatible part with VccB 1.8V supported 0 Locked

    489 views
    1 reply
    Latest over 1 year ago
    by Jack Guan
  • Suggested Answer

    SN74HCT04: SN74HCT04ANSR device marking 0 Locked

    389 views
    5 replies
    Latest over 1 year ago
    by Owen Westfall
  • Suggested Answer

    SN74LVC74A: Request regarding Junction temp 0 Locked

    256 views
    1 reply
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC1G332: Request regarding Junction temp 0 Locked

    267 views
    1 reply
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74ABT541B: Input Clamp Diode 0 Locked

    280 views
    2 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Not Answered

    TXB0104: Chip Marking 0 Locked

    455 views
    1 reply
    Latest over 1 year ago
    by Clemens Ladisch
  • Not Answered

    CD4024B: CD4024 function and output behavir 0 Locked

    394 views
    2 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC1G34: same voltage getting at output 0 Locked

    354 views
    3 replies
    Latest over 1 year ago
    by Albert Xu1
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