Thanks for this one. 16 of these are on our Cablescan devices at where we work. A Motorola 6809 uses these to toggle pull up resistors via resistor arrays.

The unique thing about these three parts is that they all have a Vee pin. This is allowed to be a negative voltage giving these devices the ability to switch analog signals that are centered around ground.

If memory serves me, the most often failure mode I ran into with this device was high internal switch resistance, and limited switching frequency. The products we produced used them quite a bit... pretty old part.

going up & down! magnificent! just incredible! this is what built innovation!

Cool component.

@andymouse

7 ай бұрын

Hi ! I have never seen this before.

@Electronzap

7 ай бұрын

@@andymouse hey Andy, good to see you again!

I swear you got a mcrophone in my house. Was just lamenting to my friend yesterday that I need something exactly like this.

Great chip and its the first time I have seen it....cheers !

I know this chip well, I'm using it on my in-13 spectrum 7 bands. The part is working very well. Thanks for sharing.

This chip family as well as the cross point versions were used in common business telephone systems for switching audio between stations and trunks before digital displaced much of that.

These are good chips, I use them for keyboard matrix scanning and controlling the octave range in my synthesizer boards. If I remember correctly, they were used for mux/demux in the mid to late 70s in the first synthesizers with digital memory.

It worth noticing however that these chips have high internal resistance (it can be lowered by connecting several channels and/or chips in parallel), and the switching speed can be not enough for certain applications.

@d614gakadoug9

7 ай бұрын

If you can get by with the lower power supply voltages (implying lower signal amplitude) there are equivalents in HC, AC and LV series. With the 4000 series parts using high supply voltages results in lower and more linear ON resistance, as a rule.

I just extended touch pins of ESP32 with CD4067 analog multiplexers. First time for 40 years I have used these chips for anything. Needs slow scanning and definitive 2 second touch, but this quite ok, when controlling lights and machinery.

nice.thank you

If you’ve already got an A2D use different resistors and no multiplexer, a ladder arrangement or something and read what’s selected as an analogue value. You definitely don’t need more than one or two resistors in the application demonstrated.

@Enigma758

7 ай бұрын

That technique is commonly used in consumer electronics.

@jms019

7 ай бұрын

But you’d use a 151 if it’s digital as indeed I did for automotive body controllers some decades ago.

@bayareapianist

7 ай бұрын

What if someone presses two buttons at the same time? This method finds it immediately, but your method needs a calculation. You could use a power of two voltage for each line tough which requires presize resistors.

@jms019

7 ай бұрын

@@bayareapianist Part of my point is that this needlessly uses an analogue multiplexer when a digital one is cheaper and more robust. It doesn’t save n-1 resistors which it could having been done with an analogue device. The 4051 can also leak onto neighbouring channels should your inputs not be well behaved. My employer back in the 90s did a study on just this.

Just used this in one of my projects

Using this to scan through a bunch of on/off switches seems like a bit of a waste of the analogue abilities of this device. Much more useful is to connect a bunch of potentiometers (or other analogue inputs). That way you can check multiple analogue sources using a single analogue input, something that's quite useful when using smaller micros that have a limited number or no analogue inputs, but the design doesnt require the processing power of a higher spec chip.

Could 2 of these be used to make an 8 way USB or audio switch? You'd need one chip for each signal. Are they fast enough?

I'd like to see an analogue switch hooked up on the curve tracer! Anyone else?

Interesting vid i have a suggestion for chip of the day irs2092😊

How fast can the chip run? How much voltage can it swing through it? Could it be used as an audio source selector in a hifi i wonder.

Can this chip be cascaded to make it 16, 24, 32, etc.? What about the CD4514? Can that be cascaded? Haven’t been able to find out. Thanks for your channel - lots of interesting things!

@IMSAIGuy

2 күн бұрын

you can cascade but remember the resistance will add up as you add more.

Hello, Microprocessor with piggy back display, Nice.. What device is this ?

@IMSAIGuy

Ай бұрын

Arduino Nano with built-in display, search aliexpress

@salehsalehi8955

Ай бұрын

@@IMSAIGuy Thank you Sir, I always enjoy your videos..

Interesting. Could be useful in a sequencer.

@pukkimi

7 ай бұрын

On my todo list. Just count with CD4040 and then a pot for each channel that defines rc constant for a hex inverter. A few buffers and you have square and triangle waves.

Example here of its use in a volume control for an amplifier kzread.info/dash/bejne/c2mJqZmkYKjLZ7w.html

@stitchinginthebarn8307

7 ай бұрын

Nice video! I loved the way you explained what was going on.

MAX14752 is a better chip... but surprised me how expensive it was.... about 20 x more than a CD4051 at about 0.50 USD per piece.

Can CMOS analog switches be used, e.g., to add microcontroller-control to devices with key-matrices? E.G. add a microcontroller and CD4066 to "press"/short the buttons on a TV remote or microwave, etc? I mean, sometimes one might want to throw uC control at such a preexisting device without knowing its implementation details... maybe all the buttons feed to separate TTL inputs with 330ohm pull-downs and the buttons short to 5V... Or maybe they're in a scanning matrix with open-collector rows, or maybe they're all tied to the same ADC pin via differing resistor values... or maybe instead of an ADC the uC pin charges a capacitor and the resistor activated by the button determines its discharge time... I guess I'm wondering how these sorts of "analog switches" compare to real switches in the sense that varying amounts and directions of current can flow through them, and the frequencies they can handle... or are they more like bidjrectional voltage-followers, where an input current may differ from an output current... or be delayed as though through a logic gate or op-amp slew rate... etc. etc. etc. E.G. If a 4066 could be used to quickly throw uC control into 90% of keypads one might encounter, (without having to go into too much reverse-engineering of the keypad electronics) it'd be very handy as a toolbag item!

@d614gakadoug9

7 ай бұрын

It is likely to be quite successful. Keypad scanning is usually pretty simple - an X/Y array where X lines are driven and Y lines received (or other way) and signals are all more or less logic levels. True touch switches that detect the influence of a capacitance on signal coupling are another matter, but even there you can probably use analog switches to advantage. You do need to be mindful of the ON resistance of the switches, but lots of keypads are made with "carbon button" contacts that are quite high in resistance.The resistance of an analog switch might be even lower than that of the "actual" switch. If you can get by with the lower supply voltage, the 74HC4xxx parts typically have substantially lower ON resistance. There are even equivalents in 74AC and 74LV families. In terms of frequency or signal delay through analog switches there should be no problem for your application. There really isn't an inherent limitation as such. It largely comes down to how the "parasitic" capacitances degrade signals. Anything up to several megahertz should be should be OK in low impedance circuits. CMOS analog switches are, in essence, a pair of MOSFETs, one N-channel and one P-channel connected in "inverse parallel." They behave like a resistance in the signal path. In precision or otherwise demanding analog circuits there are lots of things to consider - leakage currents, control signal feedthrough (charge injection), crosstalk, non-linearity of the switch resistance and the like. When those sorts of things become important it typically means abandoning 4000 series CMOS parts and going to devices with much better performance and usually substantially higher cost. There have been many, many ap notes on use of analog switches produced over the years. Analog Devices is probably a good source. I suspect it is possible to find old ap notes for the CD4000 series from RCA and some from Motorola and National Semi.. Also remember that some devices with keypads don't have galvanic isolation between AC mains and the switch contacts - they rely on insulating mechanical parts like buttons for safety. That can make things a bit messy. There are a few opto-isolated analog switches on the market but they are rather expensive. They can be very useful at times.

@ericwazhung

7 ай бұрын

@@d614gakadoug9 Awesome info, thanks! The oft-functionality of this sounds like the sorta trick that might've been in Mims' notebooks, if he had one on microcontroller-interfacing. I've wondered this for many years... Sure, it's the sorta thing I could've just tried on a case by case basis... but there are so many keypad-interfaces even in the digital-realm alone, that I wasn't comfortable even claiming it'd be "worth a try before reverse-engineering the keypad." I think from your answer, it's more than worth a try, it seems highly likely to be a nearly universal solution. Cool! Good point, by the way, about making sure the voltages are safe... and in range of the analog-switch's rails, first, though... (With matrix scanning, a multimeter probably won't give a valid reading!). And I hadn't considered a lack of isolation from mains. Still a cool trick that could save a bit of time on quick projects. Thanks again!

Do you have any videos on how to make a 60Khz antenna and amplifier for the WWVB time signal reception ?

@IMSAIGuy

7 ай бұрын

No, sorry

@d614gakadoug9

7 ай бұрын

It is such a low frequency that a whole range of op amps would be usable. Trying to keep the power ultra low could be a bit of a challenge. Depending on what you want to accomplish just using a largish ferrite rod antenna might be adequate. The antennas typically used with the dedicated WWVB receiver ICs are often pretty tiny and bigger can be better if you have room. There was a time when quite large rod antennas for this purpose could be bought ready-made, but I don't know if that is possible anymore.

i am new to electronics and datasheet , i want to know what the max current for the input and the output for it? can it handle 2 amp??

@IMSAIGuy

6 ай бұрын

no, about 100mA

What is the fastest switching time you can arrange? Can these be chained in order to get a 16-way switch?

@jrkorman

7 ай бұрын

You could use 1/3rd of a 4053 2 way to get 16. Staying in the 405x family means you can expand the select pins and inhibit. Not sure about switching speed, but am guessing high KHz range.

@RensePosthumus

7 ай бұрын

​@@jrkormanthnkx

@stamasd8500

7 ай бұрын

for a 16-way switch just use a CD4067, it is basically that in a 24-pin package

@jrkorman

7 ай бұрын

@@stamasd8500 There are electrical differences between the devices. One that could be important is the 405x devices have "break-before-make" switch action.

@RensePosthumus

7 ай бұрын

@@stamasd8500 thank you.

how about a crosspoint switch? With audio signals? ;-)

@d614gakadoug9

7 ай бұрын

Not with 4000 series CMOS parts except a low-fi. An audio crosspoint switch isn't particularly easy. You have to be very concerned with channel-to-channel crosstalk, OFF isolation, switch resistance linearity, control signal feed-through (charge injection) and the like. I've been out of this stuff for years, but I'd have a look at Maxim/Analog Devices parts. Maxim used to have some pretty impressive devices - an enormous corporate ego, but some good devices.

Not everyone celebrates Chip of the Day.

@andymouse

7 ай бұрын

Most do.

@willthecat3861

7 ай бұрын

@@andymouse But not all.