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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

    TXS0101: Device Alternatives 0 Locked

    400 views
    2 replies
    Latest over 1 year ago
    by Masaki Takeuchi
  • Answered

    SN74AHCT132: SN74AHCT132DG4 Obsolescence 0 Locked

    484 views
    11 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Not Answered

    SN74HC595: Can SN74HC595DRG4 directly replace SN74HC595DR? 0 Locked

    323 views
    2 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Answered

    SN74LV32A: Does this device have any internal pulldown/pullup resistance 0 Locked

    238 views
    2 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Answered

    SN74AHC165-Q1: Error in SCLS992 – NOVEMBER 2023 Datasheet Description Paragraph 0 Locked

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

    SN54LVTH574-SP: Single Event Effect Susceptibility or ELDRS ??? 0 Locked

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

    SN54HC164-SP: Radiation Hardened part availability (RHA) 0 Locked

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

    LSF0102: LSF0102DCUR package : Pin 1 indication 0 Locked

    423 views
    6 replies
    Latest over 1 year ago
    by Ali Abdennadher
  • Suggested Answer

    SN74LVC1G17: Output operation when input is floating 0 Locked

    879 views
    11 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Answered

    SN74HCS240-Q1: Datasheet clarification 0 Locked

    292 views
    4 replies
    Latest over 1 year ago
    by Abinaya C
  • Suggested Answer

    SN74LVC2G126: 74HC2G126DP and 74HCT2G126DP recommendation 0 Locked

    326 views
    5 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Answered

    SN74VMEH22501A: Need help in IBIS model and pull-down resistance value for 3A and 3B 0 Locked

    539 views
    6 replies
    Latest over 1 year ago
    by GAURAV UPADHYAY
  • Suggested Answer

    TXB0104: slides or doc of Translator 0 Locked

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

    SN74HC74: SN74HC74DR,Different batches of chips,they have different waveform. 0 Locked

    729 views
    21 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    CD4027B: automotive qualification 0 Locked

    591 views
    13 replies
    Latest over 1 year ago
    by Yoshikazu Kawasaki
  • Answered

    TXB0104: Question about the application of SPI signal 0 Locked

    491 views
    2 replies
    Latest over 1 year ago
    by JH Wu
  • Answered

    TIBPAL20L8-20M: Clarification RE MIL and orderable part numbers for PAL component 0 Locked

    299 views
    2 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Suggested Answer

    SN74LV08A: Ultrasonic microscopy revealed delamination. 0 Locked

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

    SN74AHC14:入力電流 0 Locked

    700 views
    3 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Not Answered

    CD14538B: Should pins 1 and 15 be grounded or left ungrounded? 0 Locked

    409 views
    6 replies
    Latest over 1 year ago
    by Kyle Hansen
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