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Logic

Logic

Logic forum

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Frequent Questions
  • Emrys Maier
    Emrys Maier
    • 3 months ago
    • Logic
    • Logic forum

    [FAQ] How do I terminate any unused channels of a logic device?

    All CMOS inputs must be terminated at either Vcc or Ground. The inputs of a CMOS device are high-impedance. These terminations can be through a resistor (for example, a 10kohm pull-up resistor to Vcc or a 1kohm pull-down resistor to ground), or they...
  • ShreyasRao
    ShreyasRao
    • 3 months ago
    • Logic
    • Logic forum

    [FAQ] Are there voltage translation device recommendations for industry standard interfaces like GPIO, SPI, UART, I2C, MDIO, RGMII, I2S etc?

    Here are the voltage level translation device recommendations for various industry standard interfaces:
  • Emrys Maier
    Emrys Maier
    • 4 months ago
    • Logic
    • Logic forum

    [FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)

    Flip-flops, latches, and registers do not have a default state on power up. The output is in an 'unknown' state until data is clocked through. This is because the underlying latch circuit used to store the output value is inherently unstable...
  • Emrys Maier
    Emrys Maier
    • 4 months ago
    • Logic
    • Logic forum

    [FAQ] How does a slow or floating input affect a CMOS device?

    There are two primary issues associated with slow and floating inputs. (1) Shoot-through current Figure 1. Typical CMOS input structure with the control voltage for each input MOSFET shown. CMOS logic devices depend on their inputs being at...
  • ShreyasRao
    ShreyasRao
    • 4 months ago
    • Logic
    • Logic forum

    [FAQ] If the OE pin is asserted to maintain Hi-Z at the IO, will it disconnect the internal pull-up resistors in TXS devices?

    Yes, the internal pull-up resistors are disconnected once OE is asserted(to enable High impedance on the IO ports) Additionally, if the device supports Vcc isolation feature (Ioff), with any one of the supplies is at ground, regardless of the state...
  • Emrys Maier
    Emrys Maier
    • 5 months ago
    • Logic
    • Logic forum

    [FAQ] [List] Logic Device Functionality Questions

    Not all of these questions have been posted on E2E yet - we are working on getting to every one as soon as we can! We will link each question as it becomes available. Common Applications of Logic How do I combine power good signals to hold a controller...
  • Emrys Maier
    Emrys Maier
    • 5 months ago
    • Logic
    • Logic forum

    [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

    This question is really about the input structure of a logic device. There are primarily two types of CMOS input structures - one with a positive clamping diode, and one without, shown here: The positive clamp diode is shown in red. If the input...
  • ShreyasRao
    ShreyasRao
    • 5 months ago
    • Logic
    • Logic forum

    [FAQ] Where do I connect the thermal pad of the logic QFN devices?

    The thermal pad is recommended to be soldered to the PCB and electrically connected to the ground for the best thermal and mechanical integrity. It can be left floating, and does not have to be soldered down if thermals are not a concern for your...
  • Emrys Maier
    Emrys Maier
    • 5 months ago
    • Logic
    • Logic forum

    [FAQ] What is the maximum capacitive load that a logic device can drive?

    There are a few issues with trying to determine a maximum capacitive load for a standard CMOS logic device. First is propagation delay. Any CMOS logic device is tested at a particular load (typically 15, 30, or 50 pF) for propagation delay. Increasing...
  • Emrys Maier
    Emrys Maier
    • 5 months ago
    • Logic
    • Logic forum

    [FAQ] Why does a logic device's part number have an E4/G4 suffix?

    In short, there will be no difference between a device labelled SN74xxG4 and SN74xx. Historically, G4 and E4 suffixes meant that the devices were rated to be "Green" or "Lead Free." However, as time has passed, all devices have been...
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  • C. Ryan Land
    Latest post by
    C. Ryan Land
    • Feb 10, 2015 2:33 PM

    Welcome! Save time, get answers quicker by following this

    • 1 Reply
    • 4045 Views
  • NAOKI AOYAMA
    NAOKI AOYAMA
    • Feb 18, 2019 2:23 AM

    SN74LVC2G14: Threshold voltage

    • 0 Replies
    • 0 Views
  • Kevin Anderson93
    Kevin Anderson93
    • Feb 18, 2019 1:49 AM

    SN74LV1T126: SN74LV1T126DCKR

    • 0 Replies
    • 0 Views
  • Kevin Anderson93
    Latest post by
    Kevin Anderson93
    • Feb 18, 2019 1:36 AM

    SN74LV1T126: Topside marking

    • TI thinks resolved
    • 2 Replies
    • 30 Views
  • user4979989
    Latest post by
    user4979989
    • Feb 17, 2019 4:37 PM

    LSF0108: Leakage 2.4V in VREF_A when enable is high

    • TI thinks resolved
    • 4 Replies
    • 47 Views
  • ISHANK VARSHNEY
    Latest post by
    ISHANK VARSHNEY
    • Feb 17, 2019 4:14 PM

    CD40106B: Regarding adjustable threshold voltage of CD40106B

    • TI thinks resolved
    • 5 Replies
    • 82 Views
  • kai klaas69
    Latest post by
    kai klaas69
    • Feb 17, 2019 2:05 PM

    CD4046B: Designing an autotune circuit with cd4046b

    • TI thinks resolved
    • 5 Replies
    • 80 Views
  • Kuan Wei Chen (Kevin Chen)
    Latest post by
    Kuan Wei Chen (Kevin Chen)
    • Feb 17, 2019 6:59 AM

    TXB0104: Suitable Part

    • TI thinks resolved
    • 6 Replies
    • 78 Views
  • Lane Boyd
    Latest post by
    Lane Boyd
    • Feb 15, 2019 7:27 PM

    LM567C: MTTF, MTBF, B10 value

    • TI thinks resolved
    • 1 Reply
    • 28 Views
  • Max Robertson
    Latest post by
    Max Robertson
    • Feb 15, 2019 6:55 PM

    AM26LS32 Part Marking

    • TI thinks resolved
    • 1 Reply
    • 37 Views
  • Dylan Hubbard
    Latest post by
    Dylan Hubbard
    • Feb 15, 2019 6:10 PM

    SN74LVC8T245: rise time spec

    • TI thinks resolved
    • 1 Reply
    • 27 Views
  • Dylan Hubbard
    Latest post by
    Dylan Hubbard
    • Feb 15, 2019 6:04 PM

    SN74LVC8T245: Schmitt trigger

    • 1 Reply
    • 38 Views
  • Emrys Maier
    Latest post by
    Emrys Maier
    • Feb 15, 2019 4:15 PM

    CD4019B: 14 pin package terminal diagram

    • TI thinks resolved
    • 6 Replies
    • 100 Views
  • ShreyasRao
    Latest post by
    ShreyasRao
    • Feb 15, 2019 3:30 PM

    SN74LV1T126: Output Impedance when no VCC is applied

    • TI thinks resolved
    • 5 Replies
    • 70 Views
  • KKF
    Latest post by
    KKF
    • Feb 15, 2019 3:29 PM

    SN74AHCT1G125-Q1: min. pad distance on the PCB

    • TI thinks resolved
    • 6 Replies
    • 106 Views
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