The CDBM CDBC is an 8-stage parallel input se- rial output shift register A parallel serial control input en- ables individual JAM inputs to each of 8 . Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . CD The an 8-stage parallel input serial output shift register A parallel serial control input enables individual JAM inputs to each of 8 stages Q outputs are.

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JoeN on Oct 09, CD – Q8 output. The first one was wrong, the 8 input switches should be connected to VDD, not ground. MarkT Brattain Member Posts: I did this before with a 74HC shift register and it clarified for me how it functions, but datxsheet the CD it’s a different story.

Mechanical switches should never drive logic clocks directly for this reason!

CD 데이터시트(PDF) – National Semiconductor (TI)

CDBE with buttons and leds Q8. Data Sheet for the CD CDBE with buttons and leds. PE – LOW 6.


Q7 goes into Q8. I’ve found some code online but unfortunately it is not helpful for understanding how the shift register works. I’ve just updated the schematic image.

CD Datasheet(PDF) – TI store

Here’s how I use the switches to duplicate what the MCU does: I read the truth table simply. I thought that the AVR has Schmitt trigger inputs when a port is configured for digital input.

I’m not sure if this is the correct way to do it but I got some results that I don’t understand. Is this not happening? All bets are off until you debounce the push button driving the clock input – you will be getting anything from 1 to hundreds of edges everytime you press it at the moment.

CD BE – Understanding the truth table. I will never ask you to do anything that I wouldn’t do myself. MarkT on Oct 06, It looks like a weird serial-in, last-three-bits-out, with parallel 8 bit preset shift register to me. In either case, after the clock rises, Q6, Q7, and Q8 are available on their respective output pins.


(PDF) CD4014 Datasheet download

This is called a “preset” function. Input s n – HIGH I did this with one of the 8 inputs and in another test with two inputs simultaneously 3. That is what the data sheet says, at least.

JoeN Edison Member Posts: What does Q1 Internal mean? Have you hit all pins with a logic probe to make sure they have the voltage you think they do?

Input s n – LOW 5. Clock falling doesn’t do a thing, as you would expect. What does Qn-1 do? According to the output table image CD – Q8 output. Here is it in English.

Under these conditions, the chip does not advance these 8 bits at all and SER IN is completely ignored. While doing the tests I wrote down the output state of Q8. CD – truth table. Basically I’m duplicating what a MCU does but at very slow speed.