Data sheet acquired from Harris Semiconductor. SCHSD. CAUTION: The CDB, CDB, and CDB analog multiplexers are digitally-controlled . Product data sheet. Rev. 12 — 25 March 4 of Nexperia. HEFB. 8- channel analog multiplexer/demultiplexer. Fig 5. Logic diagram. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in . Product Folder Links: CDB CDB CDB.

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I’m using a breadboard of questionable quality.

A 10K resistor works well in most cases. Sign up using Email and Password.

CDB Datasheet(PDF) – TI store

Though this may not be very relevant in this case, its important to note that the B is a CMOS device and hence anything less than 1. I’ve programmed a small routine that checks for consistency of cd4051bb signal reading. So – tell more about what is connected on the analog mux pins? Post as a guest Name.

Problematic breadboards cause loose connections within the board which you cannot see and hence cd44051b to situations such as open connections etc. Sign up or log in Sign up using Google.

I’m a bit lost to what the problem could be. The IC has internal protection circuits.


(PDF) CD4051B Datasheet download

What is the signal source that you’re reading? Email Required, but never shown. Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? At the very least, connect a dahasheet resistor of about 10K between IN and the 5V power source.

Is it possible that they are getting triggered? Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. The value then starts reading randomly.

I’ve tried datashfet the pull-down resistor. Also the pulldown resistor need not be that high. This means that this chip will not work with 3. Your drawing does not correspond with the nomenclature of the chip.

Datasheets search archive of electronic components datasheets

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. I’ve tried removing the pull-down resistor. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. Look at page 4 of this guide. I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.


(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers

Is there a better alternative? Sign up using Facebook. The Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: That is what seems to be the source of your problems.

From the Arduino wiki page, it reads “Futhermore, the is able to work with analog values; in the case of the Arduino, you dattasheet able to use the analog inputs with a voltage between V and route them to an Analog-In Pin on your Arduino. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. I saw a comment on the ‘arduino’ board which said that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2.

I’m trying to multiplex an analog input port on an Arduino Uno.