A shift register is a cascade of flip flops, sharing the same clock, in which the output of each flip-flop is connected to the "data" input of the next flip-flop in the chain, resulting in a circuit that shifts by one position the "bit array" stored in it

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38 views

How does a shift register work [closed]

I would like to understand better how a shift register (SIPO) works. I understand it's a series of flip-flop wired together, but I have been unable to find information on exactly how a flip-flop ...
0
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1answer
44 views

Controlling 4x4 LED matrix with Huzzah Feather and 20-pin shift register

I have a Huzzah Feather and a 20-pin shift register TPIC6B595N. I am trying to control a multiplexed 4x4 LED matrix which I have soldered appropriately. I am trying to figure out the proper way to ...
3
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4answers
235 views

Why would a designer choose to use two AND'ed input shift register such as the 74HC164?

Today I came across the 74HC164 8-bit serial-in/parallel-out shift register. Reading its datasheet, I realized that it has two serial inputs, instead of one like other shift registers, such as the ...
0
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1answer
57 views

What are the options of having multiple I/O pins and a constant duty cycle?

For some context, I want to create something like this. For now, until I change my chips (which I know I need to do as a plan to use a lower voltage Vcc2) I'm using the sn754410 h-bridge IC, 74HC595 ...
0
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1answer
265 views

Shift Registers - How does one pronounce QH'

In the datasheet for the 74HC595 shift register, pin 9 is labeled "QH'" (not to be confused with pin 7, labeled "QH" without the "'"). I understand that this pin outputs the current contents of the ...
0
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1answer
28 views

Misbehaving CD4021BE Shift-in

I have a CD4021BE set up very similarly to the Arduino ShiftIn Tutorial (the main difference being that I don't currently have 8 buttons so have just connected PI-5 to PI-7 to ground with a resistor, ...
0
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1answer
38 views

Shift-register circuit chronogram

Having this circuit and chronogram: I have to complete the chronogram for Z1 and Z2. This is what I have done: I'm a bit confused about ini being 1... I thought that it meant that Z2 would ...
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1answer
32 views

PISO Shift Register using 74LS166

I'been doing a PISO shift register using a 74LS166, but I get no results, I don't know what is happening. Here is the top view and my approach. In my approach: BLUE wire = Clear PURPLE(MARRON) = ...
1
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1answer
90 views

How to isolate the microcontroller from power source?

I'm fairly inexperienced in electrical engineer so forgive the simple question. Using a microcontroller (Netduino) and two 8bit shift register (serial in, parallel out) I'm controlling 16 LEDs. The ...
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0answers
41 views

Where am I going wrong with my datflow diagram?

I am trying to make a dataflow diagram of this: Here is what I have so far but it doesn't seem right: Where am I going wrong with my dataflow diagram?
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1answer
108 views

Do registers have a multiplexer?

We are learning about general purpose shift registers. My professor draws them with like multiplexers connected to the D's of each flip flop. So in an example of a register with a 4 bit input and ...
2
votes
1answer
111 views

ADC using MCP3008 on FPGA -

I am at the moment trying to use MCP3008 as an ADC, but for some reason it doesn't convert the output correctly. (A beginner project). I provide it with an 3.3 V = vref = Vdd = ch0 But my output ...
0
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1answer
89 views

What is the difference between 74HC595N and 74HC595B1R shift registers?

They seem pretty the same, but B1R version is almost twice cheaper (at least in my country, and I don't know what are the manufacturers).
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1answer
130 views

Bad design of shift register

I've tried to make a shift register by myself. The syntax is correct but i'm not sure if this could a good design... i commented the statements that concern me... ...
0
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1answer
83 views

Can´t get 8-bit shift register working (CD4014BE)

I can't seem to get my 8-bit shift register working. It's the CD4014BE. The datasheet can be found here. I've confirmed that the clock (pin 2) is ticking and the input (pin 4) is continuously ...
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2answers
39 views

What does it mean by “storage clock” of a shift register?

I read the data sheet of a shift register and I saw some tutorials on the internet. I can use all pins of my new shift register except pin 12. because I still don't understand what is the meaning of ...
1
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1answer
106 views

Can you calculate clock to output delay from setup time, hold time and the propagation delay of wires?

"minimum tCO = <shortest clock to source register delay> + <micro clock to output delay> + <shortest register to pin delay>" is what I found on this ...
2
votes
1answer
85 views

AVR SPI shift register not clocking

I'm trying to generate parallel output by writing serial data into a shift register (SN74HC595) via SPI on an ATMega328 (SPI master) running at 20MHz and SPI running at 10MHz. The bare minimum ...
0
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2answers
63 views

Simplest way to produce a lagging pulse (latch trigger) after receiving another pulse (clock trigger)?

I am teaching myself how to use a 74HC595 shift register, and am fairly new to proper digital circuit design. I ran into a question. I am using a simple circuit involving a few LEDs, a switch for ...
1
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1answer
68 views

Can the CMOS 4014b be used as a SIPO shift register?

I'm currently working on a school project that requires the use of an 8-bit shift register. I collected the components for the project on the last day of school rather hurriedly, and I picked the ...
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1answer
31 views

VHDL - Wrong result changing MSB of R2 input

I'm implementing a shifter using a similar strategy of T2 shifter. My implementation is in structural way but I have a problem. My code of Shifter is: ...
0
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1answer
52 views

How to Separate 7 segment power supply

I'm trying to drive a multiplexing double digit 7 segment (5261AS) using Arduino and two shift registers (74595) I need to separate power supply for the 7 segment to avoid overloading current from the ...
0
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0answers
43 views

How does T2 shifter work?

I would like to implement in VHDL a similar T2 shifter: In a book I read that the behavior of T2 shifter is based mainly in 3 stages: Let's suppose we have as inputs: R1 (64 bits, value to shift), R2 ...
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1answer
54 views

Is this a safe design for an input at a 74HCT165

I'm new to designing my own circuits so please be kind and tell me if I'm right with my thoughts or if I have errors in it. Thanks! The purpose of the 12V is to compensate the resistance of long ...
0
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2answers
981 views

How to get 3.3V from 2 AA batteries? [duplicate]

I would like to know if its possible to 'step up' the voltage from two AA batteries (3V for Alkaline and 2.4V for NiMH) to a stable 3.3V ? I need to find a good power source for a circuit that I'm ...
0
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1answer
132 views

Problem with 7-segment display: dimly lit when off

I'm driving two large seven-segment displays using two shift registers (74HC595). The displays have a forward voltage of 12V and a max forward current of 20mA. I'm feeding data and 5V of power to the ...
2
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1answer
116 views

shift registers/d flip-flop memory states

I know D flip-flops retain a certain logic level(memory) but when they output(i.e. shift) this retain memory do they loose it? for example: lets say I have 3 d flip-flops connected as a serial shift ...
0
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2answers
57 views

CD4015BC static shift register: technical specs question

Currently looking into the specifications of the CD4015BC static shift register, I came across a couple of specs for which I have some questions: 1) The clock rise and fall times should be below 15 ...
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1answer
146 views

Shift registers, understanding parallel-in serial-out

I have the 74hc597 parallel-in serial-out (PISO) shift register. The datasheet can be found here. I have a general idea about how serial-in shift registers (SIPO) work, but I'm having trouble ...
0
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0answers
78 views

A general purpose 16-bit shift register

I cannot seem to locate a general purpose 16-bit serial-in parallel-out shift register that is still being made. Although there are plenty of LED drivers that can adapted for the purpose. All I need ...
0
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1answer
108 views

8-bit Serial I/O Parallel I/O Bi-Directional Shift Register [closed]

I am looking for a register that has as stated Serial In Parallel Out and Parallel In Serial Out modes and bi-directional shift functionality all in one IC. I want to use it with Arduino. Does ...
0
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3answers
352 views

shift register RGB led brightness

I'm currently using 74HC595 shift register to light leds. Recently I decided to start using RGB leds instead of simple 1-color leds. Which means that I now have to ...
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2answers
417 views

Driving two large 7-segment displays using Arduino and shift registers

I recently started a project in which I want to control two 7-segment LED displays using two shift registers (74HC595) and my Arduino. I thought I had the basic ideas mastered, but I ran into some ...
0
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2answers
80 views

Shift registers in series

If we have for example 3x16bit shift registers connected in series, can we clock 48 bits of data through one shift register at once and then latch all of them to output data registers, LATCH CLK and ...
2
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2answers
251 views

LED hub purpose?

What is the main purpose of LED hub, is it used only for RGB matrices to connect shift registers for every color or there are some other applications? I'm working with HUB75 and that is the reason ...
0
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1answer
57 views

Shift register on sync RS flip-flop

I am trying to build serial-in shift register (non cycled) based on synchronous RS flip-flop, but i'v got a problem with synchronization. My clock generator was configured to long on period and short ...
0
votes
1answer
69 views

How can I use a single 74595 to drive two different IC's?

I'm trying to build an audio circuit with as few parts as possible. Also, I really need to limit the number of pins used on my Arduino. I didn't ask this in the Arduino site because I don't think ...
1
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1answer
133 views

Why has a LUT6 based SRL only 32 entries but not 64?

Xilinx FPGAs are capable of using LUTs as memory elements. The can be used as ROM, RAM and Shift Register (SRL). New Xilinx devices use 6-input LUTs, which gives 64x1 bit for RAMs/ROMs, but only 32 ...
0
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0answers
42 views

Sequence/Initial Polynomial of a LFSR

What is the "sequence polynomial" of a linear feedback shift register? I see it referenced in a text where it refers to the initial state polynomial divided by the characteristic polynomial. I know ...
0
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0answers
47 views

Data Transmission Including Lasers + Shift Registers

In a project we're doing we need to be able to transmit data through lasers. Data is just 4 bit binary numbers. So what we intend to do is have 4 Parallel in - Serial Out Shift Registers connected to ...
0
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1answer
75 views

Can use 17 resistors with 16 rgb led's?

I always see an rgb led ran with 3 resistors, for example a 20ma led on 5v power uses 150ohm's for red due to it's lower voltage but only 100ohms for green and blue. I am running 6 shift registers off ...
2
votes
1answer
124 views

Implementing feedback shift registers in a FPGA

I am not up on the latest FPGA capabilities. What would be the lowest cost FPGA chip that can implement 1050 linear feedback shift registers of 71 bits each register? The shift registers have to be ...
0
votes
1answer
82 views

Radix-4 multiplication problem

I'm writing code in verilog that take A,B as 8 bit input ,multiply them using radix -4 method . when i execute the code the shft output appear as "xx0" and mutipler can't take the value of the input ...
0
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1answer
90 views

High frequency SPI-like communication: is there any hardware allowing software tweaking?

I will need to communicate with a device using serial protocol mostly similar to SPI but with several changes: Data packet can has any bit length (e.g. 35 bits) Stop sequence formed by lack of ...
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votes
1answer
110 views

Voltage used up by a transistor and shift registers

i am on a project 8x8x8 LED cube and I am stuck on the value of register i should use. Talking about single layer I am using 2N5296 transistor for common cathode and 8 shift registers for controlling ...
0
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1answer
59 views

Do shift registers refresh?

Say there are 2 Shift Registers chained together with the following values SR1 : 11111111 SR2 : 11001111 The data is written to SR1 and then to SR2 like: ...
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0answers
79 views

Reverse Shift Register?

I'm super new to electronics and am wondering if there is anything that behaves like the reverse of a shift register... as in parallel in and serial out instead of serial in and parallel out. I know ...
0
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1answer
43 views

4-bit Register with Four Operations

I'm given a task to design a 4-bit register using D Flip-Flops (and MUXes) that operates according to the following selection inputs: When.. S1S0 = 00, No Change; S1S0 = 01, Register is Cleared to ...
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1answer
65 views

Running a 7v shift register from arduino 3.3v

Im trying to learn some electronics, so im not that confident with some of these systems, I recently bought a load of the alphanumeric displays from Sparkfun but foolishly read the data sheet for ...
0
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1answer
263 views

No output or invalid output on a 74HC595 shift register

I have a PIC18F2550 microcontroller on one board with three daisy chained 74HC595 chips. These are driving 7-segment displays and everything is working fine. 7-segment displays are connected with a ...