Discussion Overview
The discussion revolves around the design of a 3:8 decoder with tristate outputs, focusing on how to modify existing decoders to achieve high impedance states for unused outputs. Participants explore the feasibility of this modification and the components involved.
Discussion Character
- Technical explanation
- Exploratory
Main Points Raised
- One participant expresses the need for a tristate decoder that can have unused outputs as open circuits and questions the possibility of modifying a standard 3:8 decoder to achieve this.
- Another participant suggests that using tri-state buffers on the outputs of the decoder might be a simpler solution, questioning whether the original poster's goal is to learn about the decoder circuit itself.
- The original poster confirms they opted for tri-state buffers after learning about them and inquires about datasheets for these buffers.
- A later reply identifies specific octal tri-state buffers, mentioning the '245 and '240 models, and distinguishes between slow and fast CMOS options.
Areas of Agreement / Disagreement
Participants appear to agree on the utility of tri-state buffers for achieving the desired functionality, but the discussion does not resolve whether modifying the decoder itself is feasible or necessary.
Contextual Notes
There is a lack of detailed specifications regarding the original decoder design and the specific requirements for the tristate outputs, which may affect the proposed solutions.