By chaining D FFs together, it is easy to make a binary counter. But they can be used to generate other sequences as well, such as gray code. I think that is what is meant by "pattern generator". Also, it should be pointed out the D FFs are commonly used to implement Finite State Machines (FSMs). Note that for pattern generators and FSMs, some additional "glue logic" may be necessary.
Pattern generator: 1) 3b shifted with the last /Q fed back to the first D becomes a divide by 8 ring counter. 2) 1 -- but with some other D fed from /Q also. 3) some Ds fed from XOR of 2 bits.
@@tfrerich thanks. a demo would be pretty cool, it would have been cool if you did pipeline em, but u only mentioned it, you didnt actually wire it up which is a pity. btw great channel!!!!
What you're looking for is a 'sample-and-hold'. It can be made with a dual op-amp, an analog switch (like a CD4066B or a DG401) and a low-leakage capacitor. I think I've given you enough keywords that a search engine can direct you to a wealth of information.
I could use this as a quad clock divider instead of two 7474s. I never noticed it before. Thanks for the tip. I wonder if there's a 6 or 8 D flip-flop version (with Q and /Q). Alas, I know the 74174 does not have the /Q outputs.
The "pattern generation" it speaks of is probably a Linear Feedback Shift Register (LFSR) - wiring it as a shift register, but the input pin is an XOR of the last output bit and one other intermediate bit; if you do it right then it will cycle through all possible 4-bit sequences in turn (other than 0000). See en.wikipedia.org/wiki/Linear-feedback_shift_register
Can you make video about 7495? It's a swiss knife register that can be used instead of 74175 and even as shift left/right register! It's a pity i can't find 7495 on Aliexpress now...
it is a style I like. It show that the input is a logic low true and the output is a logic low true. you can see the mark clear with a line above, also saying it is low true logic.
Thanks for making these chip of the day videos. Have learned quite a bit following along
By chaining D FFs together, it is easy to make a binary counter. But they can be used to generate other sequences as well, such as gray code. I think that is what is meant by "pattern generator". Also, it should be pointed out the D FFs are commonly used to implement Finite State Machines (FSMs). Note that for pattern generators and FSMs, some additional "glue logic" may be necessary.
"Pattern generator" -- "random bit generator" - shift register with linear feedback.
If your D remains high for longer than 4 hours of clock cycles, please seek a physician
D stands for what?
imsai tearing stuff up! quadruple!!! quadruple farfroople madoople! educated!
Pattern generator: 1) 3b shifted with the last /Q fed back to the first D becomes a divide by 8 ring counter. 2) 1 -- but with some other D fed from /Q also. 3) some Ds fed from XOR of 2 bits.
u know what id love to see. a scalar register that holds an analogue value!!!
You could go grab an Analog Devices SMP04 or the (much pricier) AD684.
@@tfrerich thanks. a demo would be pretty cool, it would have been cool if you did pipeline em, but u only mentioned it, you didnt actually wire it up which is a pity. btw great channel!!!!
@@tfrerich if u pipeline the registers, you can actually do a digital filter with them! (use them as filter taps.)
sample and hold: ruclips.net/video/nlJDjPK5wgQ/видео.html
What you're looking for is a 'sample-and-hold'. It can be made with a dual op-amp, an analog switch (like a CD4066B or a DG401) and a low-leakage capacitor. I think I've given you enough keywords that a search engine can direct you to a wealth of information.
Thanks, I was playing around with a 7474 just yesterday. Didn't work quite as planned (latch for a 8 bit CPU memory access) but I'm getting close.
Try octals 74273 (resettable) or 74373 (transparent) or 74374 (3 state).
I could use this as a quad clock divider instead of two 7474s. I never noticed it before. Thanks for the tip. I wonder if there's a 6 or 8 D flip-flop version (with Q and /Q). Alas, I know the 74174 does not have the /Q outputs.
you should put a some what transparent film over those leds, this will make them visible even under heavy lighting.
The "pattern generation" it speaks of is probably a Linear Feedback Shift Register (LFSR) - wiring it as a shift register, but the input pin is an XOR of the last output bit and one other intermediate bit; if you do it right then it will cycle through all possible 4-bit sequences in turn (other than 0000). See en.wikipedia.org/wiki/Linear-feedback_shift_register
i got a lot of the 74HC174, but this one also has benefits, the additional not Q gates.
The 74175 wasn't very exciting when I was in college 45 years ago, and it's still not exciting today!
Where do you get those nifty PCB:s for power, LEDs and buttons?
www.pcbway.com/project/shareproject/Protoboard_Power_Connector_55084a5d.html
I don't have the others for sale
Can you make video about 7495? It's a swiss knife register that can be used instead of 74175 and even as shift left/right register! It's a pity i can't find 7495 on Aliexpress now...
OK
There were times when 7400 7474 7495 7493 74138 78153 is all we had for our circuits, and just 7400 7474 was enough for everything! @@IMSAIGuy
Why on the clr input do they draw it as an inverted inverter instead of just a buffer?
it is a style I like. It show that the input is a logic low true and the output is a logic low true. you can see the mark clear with a line above, also saying it is low true logic.
quadrature clock?