74HC164 Register: Equivalent, Pinout and Truth Table

74HC164 is a CMOS Level 8-Bit, two serial inputs based and parallel output shift register that can be used to increase the output pins of the microcontroller unit. 

The specification can be found on the part number itself where 74 is derived from the 7400 logic family and the HC stands for the High-Speed CMOS operation. 

Since it is 8-bit, it has 8 output pins which can be assumed as 8 output pins of any microcontroller unit. Thus, it can asynchronously have data serially in its input pins microcontrollers and provide output on 8 different output pins which can be further connected to Transistor switches, LEDs, or in other input pins of sensor or parallel interfaces. 

One of the best use cases is controlling LED arrays or LCDs that support 8-bit parallel inputs. So, if in your application, you are running out of output pins, then this 74HC164 8-Bit Parallel out / serial-in shift register might be the right choice for you.

Symbol

Footprint

-Operating Voltage: 2V to 6V

-Current Consumption: 100uA (max)

-Output current Source: ±25mA

-Input and Output Voltage is equal to Operating voltage (Can be 0 and VCC)

-High-level Output Voltage: 4.4V @(Vcc=4.5V)(Minimum)

-Low-level Output Voltage: 0.1V @(Vcc=4.5V)(Maximum)

-Clock Frequency: 54Mhz @4.5V(Maximum)

-Package type: 14-pin PDIP, FK, SSOP, CDIP, SOIC

-Sinks or Sources 4mA at VCC = 4.5V

-CMOS Low Power Consumption

-Schmitt Trigger Action at all Inputs

-ESD Protection Exceeds JESD 22

Toshiba Semiconductor and Storage 74HC164D technical specifications, attributes, parameters and parts with similar specifications to Toshiba Semiconductor and Storage 74HC164D.

74HC164 is easy to interface with. It is very useful for microcontrollers or microprocessors. This device takes Two inputs across an AND Gate and sends the data to its 8-bit parallel output pins. To provide the serial data into its parallel output pins, it requires a clock signal. The 8-bit data output is only available when Pin 1, B is enabled. To provide the clocking, a low-to-high transition can be applied in CLK input while sending the data over its serial input pins. Each new cycle of data is started with the high to low transition in the Clear Pin pin. The state of the pins can be seen properly in the image given below, which is taken from the 74HC164 datasheet.

The CLK pin is constantly getting the Clock input, the data enable pin B is high and the data input pin A is receiving the serial data which is reflected on the 8-bit parallel port. For connection, the schematic given below can be useful for interfacing with a microcontroller or microprocessor. 

As we can see in the above image, only 4 pins are required for connecting the 74HC164 with a microcontroller or microprocessor. Appropriate logic levels enable the data input from 8 buttons, and the serial data can be harvested from the output pin of the 74HC164.

●Used in General Purpose Logic

●Used in Wide Array of Products Such as: PCs, Networking, Notebooks, Netbooks, Computer Peripherals, Hard Drives, CD/DVD ROM, TV, DVD, DVR, Set-Top Box

Toshiba Corporation (Kabushiki Kaisha Tōshiba, Toshiba Corporation, English: /təˈʃiːbə, tɒ-, toʊ-/) is a Japanese multinational enterprise group headquartered in Minato-ku, Tokyo. Its diversified products and services include power, industrial and social infrastructure systems, elevators and escalators, electronic components, semiconductors, hard disk drives, printers, batteries, lighting, and IT solutions such as quantum cryptography. It is one of the largest manufacturers of personal computers, consumer electronics, household appliances, and medical equipment. As a semiconductor company and the inventor of flash memory, Toshiba has been one of the top 10 in the chip industry until its flash memory division was split into Toshiba Memory, later Kioxia in the late 2010s.

Download datasheets and manufacturer documentation for Toshiba Semiconductor and Storage 74HC164D.