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74HC datasheet, 74HC pdf, 74HC data sheet, datasheet, data sheet, pdf, Philips, 8-bit shift register with input flip-flops. 74HC Counter Shift Registers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC Counter Shift Registers. (Note: Microdot may be in either location). See detailed ordering and shipping information in the package dimensions section on page 2 of this data sheet.

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When the latch pin is LOW, it listens to the clock pin and passes information serially.

Arduino – ShiftIn

Synchronous Serial fatasheet, either input or output, is heavily reliant on what is referred 74hc957 as a clock pin. If supplementing your Arduino with an additional 8 digital inputs isn’t going to be enough for your project, you can have a second CD pass its information on to another CD which will stream all 16 bits of information to the Arduino.

This pin should be connected to an input pin on your Arduino Board, referred to as the data pin.

The example below details how to use this system. This means you can read the state of up to 8 digital inputs attached to the register all at once. That means every time the latch pin transitions from HIGH to LOW the shift register will start passing its most current switch information. When the latch pin is HIGH the shift register is listening to its 8 parallel inputs. It is referred to as a latch pin. Q8 is the only one used in darasheet examples.


Two of these connections simply extend the same clock and latch signal from the Arduino to the second shift register yellow and green wires. There is more information about shifting in the ShiftOut tutorial. Within reason, you can keep extending this daisy-chain of shift registers until you have all the inputs you need. Before you start wiring up your board here is the pin diagram of the CD from the Texas Instruments Datasheet. This is called Asynchronous Parallel Input.

Using a parallel to serial shift register you can collect information from 8 or more switches while only using 3 of the pins on your Arduino. Q7 is a pulse behind Q8 and Q6 is a pulse behind Q7. In this example you’ll add a second shift register, doubling the number of input pins while still using the same number of pins on the Arduino. Serial Output Pins from different steps in the sequence. If you know you will need to use multiple shift registers like this, check that any shift registers you buy can handle Synchronous Serial Input as well as the standard Synchronous Serial Output capability.


The transfer of information on the data pin is called “Synchronous Serial Output” because the shift register waits to deliver linear sequence of data to the Arduino until the Arduino asks for it. Synchronous Serial Input is the feature that allows the first shift register to receive and transmit the serial output from a second one.

Datasheet «MC54/74HC597»

The clock pin 74gc597 the metronome of the conversation between the shift register and the Arduino, it is what keeps the two systems synchronous. The one momentary switch will be telling the microcontroller that the setting switches are being changed.

The third pin attached to the Arduino is a “Parallel to Serial Control” pin. Sometimes you’ll end up needing more digital input than there are pins on your Arduino.

Notice that there is one momentary switch and the rest are toggle switches. This is because the code examples will be using the switches attached to the second shift register as settings, like a preference file, rather dataeheet as event triggers.

The blue wire is going from the serial out pin pin 9 of the first shift register to the serial data input pin 14 of the second register.