5. Logic Families - Part E
The chapter discusses various aspects of CMOS technology, including tristate outputs, input protection, and the significance of unused inputs. It covers CMOS subfamilies, such as the 4000 series and the 74C series, detailing their characteristics and advantages. Additionally, the chapter addresses BiCMOS logic and its enhanced features, along with the challenges presented by latch-up conditions in CMOS devices.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- Tristate CMOS devices function similarly to tristate TTL devices, enabling multiple outputs to be connected together under specific conditions.
- Unused CMOS inputs should be connected to ground or VDD to prevent noise and static charge buildup, which can lead to undesirable operational consequences.
- BiCMOS logic combines the benefits of both bipolar and CMOS technologies, optimizing performance and power efficiency.
Key Concepts
- -- Tristate Outputs
- Outputs that can exist in one of three states: high, low, or high-impedance, allowing multiple outputs to be connected to the same bus.
- -- Latchup Condition
- An undesired condition in CMOS devices where parasitic bipolar transistors lead to excessive current flow and potential device destruction.
- -- BiCMOS Logic
- A logic family that integrates bipolar and CMOS transistors to leverage the strengths of both in terms of speed and power efficiency.
Additional Learning Materials
Supplementary resources to enhance your learning experience.