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Frequent Questions
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
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
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
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
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
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
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
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
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
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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