74HC165 PDF

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74HC are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC °C ~ °C. Mounting Type, Through Hole. Package / Case, DIP (” , mm). Supplier Device Package, PDIP. Base Part Number, 74HC ON Semiconductor 74HC Logic – Shift Registers parts available at DigiKey.

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How to Build a Register Circuit with a 74HC165 Chip

This gives you a flexibility when to read the input to the shift registers. January 8, at 8: Anything 74hc65 like 1Hz to a 74hc1665 KHz is sufficient. I’ve taken a look at the code made by Darran Hunt and I think he only implemented the sending of joystick data to the PC, not the keystrokes. We simply tie this pin LOW.

A clock can be built with a multivibrator circuit in astable mode. In your schematic, A2, A3, and A5 are not wired, but they are used in your code. After that, you could merge this code with Darran’s code to come out with what you want to achieve.

The 74hc code has been taken from your site.

74HC 8 bit Parallel in/Serial out Shift Register – Zx Lee

Another thing that you can try is, first make sure you read what is exactly send from the shift register. When this pin is LOW, we cannot. November 27, at 9: I have merged the two codes and when I plug in as a 74hc16 device the correct buttons are lit, however on button change it all 774hc165 manic. May 11, at 7: Could you paste the link to your code on Arduino Forum for me to take a look?


December 1, at 8: This clocks in data to the 74HC register. The 74HC is a pin chip. This will stop the circuit being unreliable especially as you chain more chips. I have two thumb sticks on a1 – a4. You can refer there on how to use two 74HC to increase the number of input pins.

Amended on Thu 09 Oct If you would like to cascade 74HC, the only modification you need to make is add the number of shiftIn depending on how many you are using. We connect the Clock inhibit pin, pin 15, to ground.

This is in contrast to a parallel shift 47hc165, in which all 8 bits are shifted in at the same time. A clock can be obtained from a timer circuit in astable 74jc165. In this project, we will build a register circuit using a 74HC chip.

A function generator can be put in square wave mode in which case it can function as a clock. Parallel-loading means that all the 8 bits can be loaded all together at one time.


The 74HC lets you read 8 digital inputs quickly by shifting in all 8 bits in a single SPI instruction. Hi Sammy, please refer to the code in the article, line 39 to 51 is how the bits are converted into printable characters on the LCD.

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November 19, at 2: You are commenting using your WordPress. We connect SER, pin 10, to ground. I really have appreciated your input. These are pins 11, 12, 13, 14, 6, 5, 4, and 3.

January 8, at 7: The real use of it, though, would be parallel-to-serial conversion. Why have you left out the decoupling capacitors? Q 74hc1655 gives us the outputs from H to A. Schematic The 74HC is a bit different in operation to the 74HC because you have to pulse the “load” pin 1 to cause the register to load its external inputs into its internal registers.