3228

8-256 decoder

 
Overview

Built using 17 74hc154s, one of which is the controller and the remaining 16 are outputs

74hc154 is a 4-16 line decoder, which can be combined to become an 8-256 line decoder.

The PCB currently in progress has been completed. The scrap draft is discarded and will not be modified (in fact, the wiring is not finished yet). The double-sided one has components attached to both sides. Although the wiring is simple, it cannot be used with Jialichuang's SMT.

All traces are 10 mil wide and can probably carry a current of 0.5a (in order to reduce costs, I almost followed the smallest size of the Jialichuang process and made a 10*10cm module)

There are 3mm openings at the four corners for easy insertion of copper posts.

There is one in the BOM called 256o (package is 268pin). You don’t need to buy it. You just need to get enough 268pin pin headers (2.54mm) and solder them on the board.

Two power supplies, one vcc and one gnd

Enter 8ah

There are 2 enable ports, any one is high level, and the output is all high level.

Output 256

Working voltage: 2v-6v (see the 74hc154 data sheet for details)

If there are experts here, you can help check the errors in the schematic diagram. I will correct them as soon as possible after receiving feedback.

 

above

参考设计图片
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Update:2025-07-02 01:13:52

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