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NXP 74HC164 8-Bit, Edge-triggered Shift Register

8-bit serial-in, parallel-out shift register

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Brands: NXP Semiconductor

Mfr.Part #: 74HC164 8-Bit, Edge-triggered Shift Register

Datasheet: 74HC164 8-Bit, Edge-triggered Shift Register Datasheet (PDF)

Package/Case: SOP5.2

Product Type: Integrated Circuits (ICs)

RoHS Status:

Stock Condition: 2124 pcs, New Original

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74HC164 8-Bit, Edge-triggered Shift Register General Description

The 74HC164 is an 8-bit, edge-triggered shift register, designed for serial input with outputs from each stage. Its operational features include:

Input Through Serial Data Pins: Data inputs are via SDA or SDB pins. These inputs are configured in a logical AND arrangement. One of these pins can act as an active HIGH enable, while the other handles data input. If only one input is needed, the pins can either be joined or the inactive pin set to HIGH.

Shifting Data: Data enters the first stage (Q0) at each LOW to HIGH transition of the Clock Pin (CP). At the same CP edge, data shifts from each current stage (Qn) to the next (Qn+1). It's vital that the data at DSA and DSB remains stable around the CP's rising edge to adhere to the timing requirements for set-up and hold.

Resetting the Register: Activating the Master Reset (MR) pin with a LOW signal resets all Qn outputs to LOW. This action is not influenced by the states of the serial input or clock pins. To ensure proper functionality, MR should remain HIGH for a specific duration before a subsequent CP positive edge.



Specification Value
Operating Voltage 2V to 6V
Current Consumption (max) 100uA
Output Current Source ±25mA
Input/Output Voltage Range 0 to Operating Voltage (VCC)
Min. High-level Output Voltage 4.4V @ VCC=4.5V
Max. Low-level Output Voltage 0.1V @ VCC=4.5V
Max. Clock Frequency 54MHz @ VCC=4.5V
Package Options


Pin Description


It operates within a wide supply voltage range, extending from 2.0V to 6.0V.
The device is capable of sinking or sourcing 4mA at a supply voltage (VCC) of 4.5V.
Utilizing CMOS technology, the 74HC164 benefits from low power consumption.
All inputs on the 74HC164 incorporate Schmitt Trigger action.
It offers substantial electrostatic discharge (ESD) protection, surpassing JESD 22 standards, which includes a 200-V Machine Model (A115), a 2000-V Human Body Model (A114), and exceeding 1000-V in the Charged Device Model (C101).
This shift register is available in various packaging options, including SO-14 and TSSOP-14.
The 74HC164 is environmentally conscious, being totally lead-free, fully RoHS compliant, and devoid of halogen and antimony, thus qualifying it as a “Green” device.

Absolute Maximum Ratings

74HC164 Equivalent Parts

The 74HC164 shift register has several alternative products that offer similar functionality with some variations.

74HC595: This is another popular shift register, which differs from the 74HC164 in that it includes an 8-bit, serial-in, parallel-out shift register along with an 8-bit storage register. This allows for both serial and parallel output.

74HCS594: This is a variant in the same family, offering similar features with potentially different specifications or enhancements tailored for specific applications.

74HCS596: Similar to the others in functionality, this variant might offer different operational characteristics or be optimized for specific use cases.

MC74HC164ADR2G: An 8-bit serial-in/parallel-out shift register in an SOIC-14 package, provided by Rochester Electronics LLC, offers versatile data shifting capabilities.

CD74HC164M96G4: Texas Instruments presents a high-speed CMOS Logic 8-bit serial-in/parallel-out shift register in a 14-SOIC package, ideal for rapid data processing.

MM74HC164MX: Texas Instruments offers the MM74HC164MX, an 8-bit serial-in/parallel-out shift register in a space-saving SO-14 package, combining compactness and functionality.

MC74HC164D: Motorola Semiconductor Products manufactures the MC74HC164D, a serial-in/parallel-out shift register in a SOIC-14 package, suitable for various applications.

CD74HC164M: Thomson Consumer Electronics produces the CD74HC164M, a logic circuit designed to meet specific electronic needs.

MC74HC164AD: Rochester Electronics LLC offers the MC74HC164AD, an 8-bit serial-in/parallel-out shift register in a SOIC-14 package, providing flexible data handling.

MM74HC164M_NL: Fairchild Semiconductor Corporation presents the MM74HC164M_NL, a lead-free version of the shift register in a SOIC-14 package, addressing environmental concerns.

933714070652: NXP Semiconductors introduces the 933714070652, an HC/UH series 8-bit serial-in/parallel-out shift register in an SOT-108-1, SO-14 package, suitable for diverse applications.

74HC164 Circuit Diagram

74hc164 Truth Table

CP (Clock) Input: High (H) to Low (L) transition
DSA (Serial Data Input A): Data input on CP transition
DSB (Serial Data Input B): Data input on CP transition
CLR (Clear) Input: Asynchronous clear
Q0 to Q7 (Parallel Outputs): Data output after CP transition

CP   DSA  DSB  CLR   Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
H    X    X    L     Z  Z  Z  Z  Z  Z  Z  Z
L    X    X    X     Q7 Q0 Q1 Q2 Q3 Q4 Q5 Q6

CP: Clock input transition from high to low causes data to shift.
DSA/DSB: Data is input through either DSA or DSB.
CLR: Clear input resets all outputs to low when low (asynchronous).
Q0 to Q7: Parallel outputs that reflect the data after a clock transition.
Note: "X" represents the input state, "Z" represents a high-impedance state, and "Qn" represents the output state.

74HC165 vs 74HC164

The 74HC165 and 74HC164 are both shift registers, but they have different functionalities.

8-bit serial-in/parallel-out shift register.
Data is serially input through a single pin.
Useful for parallel data input from external sources.

8-bit serial-in/parallel-out shift register.
Data is serially input through two pins (DSA and DSB).
Offers flexibility for dual data input.

While they share similar names and 8-bit parallel output configurations, the 74HC165 is designed for single serial input, while the 74HC164 supports dual serial inputs, providing different options for data input.


General Purpose Logic: It's used widely in various logic circuits due to its functionality and reliability.

In Computing Devices: The 74HC164 is utilized in PCs, networking hardware, notebooks, and netbooks, playing a vital role in data handling and processing.

Computer Peripherals: It's integral to the operation of computer peripherals like hard drives and CD/DVD ROMs.

Consumer Electronics: The shift register is also employed in TVs, DVD players, DVRs, and set-top boxes, assisting in data management and signal processing tasks.






74HC164 Manufacturer

The 74HC164 shift register is a commonly available component manufactured by various semiconductor companies. Some well-known manufacturers of the 74HC164 include Texas Instruments (TI), NXP Semiconductors, ON Semiconductor, STMicroelectronics, and others. These companies produce integrated circuits that meet the 74HC164's specifications and are widely used in electronics applications.

2D and 3D Model

74HC164 CAD Model

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74HC164 vs 74HC595

74HC vs 74LS Series ICs


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74HC164 8-Bit, Edge-triggered Shift Register FAQ

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  • What is the lifespan of 74HC164 8-Bit, Edge-triggered Shift Register?

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