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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

    SN74LV1T34: Can I connect 4 SN74LV1T34 in parallel? 0 Locked

    301 views
    3 replies
    Latest over 4 years ago
    by Emrys Maier
  • Answered

    TXB0104: TXB0104 application question 0 Locked

    407 views
    4 replies
    Latest over 4 years ago
    by Clemens Ladisch
  • Suggested Answer

    about I2C bus pull up resistor calculation 0 Locked

    441 views
    7 replies
    Latest over 4 years ago
    by Zhonghui Xu
  • Not Answered

    Schmitt trigger that can operate at negative VCC 0 Locked

    455 views
    2 replies
    Latest over 4 years ago
    by Koteshwar Rao
  • Suggested Answer

    LSF0102: Need comparison table between LSF and TXS devices 0 Locked

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

    SN74AS869: Need equivalent part 0 Locked

    379 views
    5 replies
    Latest over 4 years ago
    by Emrys Maier
  • Answered

    SN74HCS74: Connecting Clock to Data 0 Locked

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

    SN74LVCH16T245: Question about data sheet statements 0 Locked

    408 views
    4 replies
    Latest over 4 years ago
    by Dan Shupe
  • Suggested Answer

    SN74AHC08QPWRDL max input voltage tolerance 0 Locked

    564 views
    3 replies
    Latest over 4 years ago
    by Chad Crosby
  • Suggested Answer

    SN74HC14: Affected parts - SN74HC14N,SN74HC165N,SN74HC595N 0 Locked

    348 views
    1 reply
    Latest over 4 years ago
    by Chad Crosby
  • Answered

    SN74LV123A: Propagation delay (tPLH) 0 Locked

    399 views
    1 reply
    Latest over 4 years ago
    by Chad Crosby
  • Answered

    TXS0104E: Driving current 0 Locked

    350 views
    6 replies
    Latest over 4 years ago
    by Jeff YANG
  • Answered

    SN74LVC245A: 5V application 0 Locked

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

    SN74LVC1G123: Plus width 0 Locked

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

    SN74LVC1G125: 74LVC1G125DCKRG4 and SN74LVC1G125DCKT 0 Locked

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

    SN74AVC4T774: What's the difference between SN74AVC4T774RSVR, 74AVC4T774RSVR-NT and 74AVC4T774RSVRG4? 0 Locked

    562 views
    3 replies
    Latest over 4 years ago
    by Clemens Ladisch
  • Answered

    SN74S244: Logic compatibility 0 Locked

    439 views
    4 replies
    Latest over 4 years ago
    by KEERTHANA S67
  • Answered

    TXB0304EVM: Not functioning properly when OE pulled low 0 Locked

    389 views
    2 replies
    Latest over 4 years ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC1G14-Q1: Output state when VCC falls below minimun voltage 0 Locked

    386 views
    1 reply
    Latest over 4 years ago
    by Chad Crosby
  • Answered

    SN74AVC4T774: JTAG voltage level transceiver 0 Locked

    982 views
    10 replies
    Latest over 4 years ago
    by Asaf Abraham
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