Types of Noise to be Noted
Care should be exercised as to switching noise when using CMOS logic ICs. Major types of noise include:
(a) Switching noise (overshoot, undershoot, ground bounces)
(b) Signal reflection
(c) Crosstalk noise
See the figure below. Each type of noise is detailed in the following subsections. These types of noise are caused by the output slew rate (di/dt or dv/dt) and the output trace. Care should also be taken as to electromagnetic interference (EMI) noise generated under multiple combined conditions and electromagnetic susceptibility (EMS) noise emitted by nearby electronic devices.
Usage Considerations of CMOS Logic ICs
Handling of Unused Input Pins
Input Rise and Fall Time Specifications
Multiple Outputs from a General-Purpose CMOS Logic IC Come Into Conflict (Short-Circuiting)
Connecting a Load Capacitance to a CMOS Output Pin
Calculating the Operating Supply Current and Power Dissipation
Level Shifting Using an Input-Tolerant Function
Example of Application of the Power-Down Protection Function (Partial Power-Down)
Input-Tolerant and Output Power-Down Protection Functions Available with Each Series
Countermeasures for Reducing Switching Noise
Countermeasures for Signal Reflection
Countermeasures for Crosstalk
Countermeasures for Hazards
Countermeasures for Metastability
Countermeasures for Latch-Up
Countermeasures for ESD Protection
Products
Related information
- Application Notes
- FAQ
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