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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

    SN74HCS08-Q1: Low power consumption for hcs family 0 Locked

    352 views
    3 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Suggested Answer

    SN74S38: Defects when used in a low temperature environment 0 Locked

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

    SN74HCT240: Logic forum 0 Locked

    199 views
    1 reply
    Latest over 1 year ago
    by Albert Xu1
  • Not Answered

    SN74HCT240: SN74HCT240 0 Locked

    188 views
    1 reply
    Latest over 1 year ago
    by Albert Xu1
  • Not Answered

    SN74AHCT08: SN74AHCT08PW 0 Locked

    177 views
    1 reply
    Latest over 1 year ago
    by Albert Xu1
  • Answered

    SN74HC138: What is the difference between the PWT (obsoleted on digikey) and the PWR variants? 0 Locked

    327 views
    2 replies
    Latest over 1 year ago
    by Anirudh Nair
  • Suggested Answer

    SN74AHCT1G08: SN74AHCT1G08DBV 0 Locked

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

    SN74LVC1G08-Q1: Output drive capability 0 Locked

    323 views
    2 replies
    Latest over 1 year ago
    by Joey van Hummel
  • Answered

    TXV0106-Q1: Output channel to channel skew and duty cycle variation 0 Locked

    359 views
    2 replies
    Latest over 1 year ago
    by Clemens Ladisch
  • Answered

    CD4015B: SEU Immune Shift Register? 0 Locked

    408 views
    4 replies
    Latest over 1 year ago
    by Daniel Washington
  • Answered

    SN74AXC4T774-Q1: Thermal Pad on WQFN package 0 Locked

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

    TXS0104E: Need SPICE model 0 Locked

    366 views
    1 reply
    Latest over 1 year ago
    by Jack Guan
  • Not Answered

    SN74AHCT541: SN74AHCT541PW 0 Locked

    229 views
    1 reply
    Latest over 1 year ago
    by Gerardo Leyva-Hernandez
  • Suggested Answer

    TXB0102: TXB 0 Locked

    393 views
    5 replies
    Latest over 1 year ago
    by Jack Guan
  • Answered

    TXS02612: Different voltage VCCB0 and VCCB1 0 Locked

    319 views
    2 replies
    Latest over 1 year ago
    by Stefano Asiri
  • Suggested Answer

    SN74HC32: SN74HC32N Consult the PIN foot yellow problem 0 Locked

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

    SN74HCS595-Q1: Absolute Maximum Ratings of OE 0 Locked

    343 views
    3 replies
    Latest over 1 year ago
    by Malcolm Lyn
  • Suggested Answer

    CD74ACT74: QUestion about part fabrication 0 Locked

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

    TXS0108E: TXS0108E 0 Locked

    456 views
    8 replies
    Latest over 1 year ago
    by Jack Guan
  • Answered

    SN74LVC1G04: General Inquiry for Ni Au Pd plating 0 Locked

    590 views
    3 replies
    Latest over 1 year ago
    by Ian Graham
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