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74HC194 4-bit universal bi-directional Shift Register

SKU: L45RBI0IYU
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The 74HC194 is a high-speed 4-bit Universal Bi-Directional Shift Register IC based on High-Speed CMOS (HC) technology. It is capable of performing multiple data manipulation functions, including shift left, shift right, parallel load, and data hold, making it one of the most versatile shift registers available for digital electronics applications. The IC incorporates four edge-triggered D-type flip-flops with separate serial...
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The 74HC194 is a high-speed 4-bit Universal Bi-Directional Shift Register IC based on High-Speed CMOS (HC) technology. It is capable of performing multiple data manipulation functions, including shift left, shift right, parallel load, and data hold, making it one of the most versatile shift registers available for digital electronics applications.

The IC incorporates four edge-triggered D-type flip-flops with separate serial inputs for left and right shifting, four parallel data inputs, and four parallel outputs. Two mode select inputs determine the operating mode, while an asynchronous master reset allows all outputs to be cleared instantly.

Operating over a wide supply voltage range of 2V to 6V, the 74HC194 offers low power consumption, high noise immunity, and compatibility with both CMOS and TTL logic families. It is widely used in digital communication systems, data storage, serial-to-parallel conversion, microprocessor interfacing, LED display control, robotics, industrial automation, and educational electronics projects.

Key Features

  • 4-bit universal shift register
  • Bi-directional shift operation
  • Supports left and right serial shifting
  • Parallel data loading capability
  • Data hold (no-change) mode
  • Asynchronous master reset
  • High-speed CMOS technology
  • Low power consumption
  • High noise immunity
  • Wide operating voltage range
  • Separate serial inputs for left and right shifting
  • Four parallel outputs
  • CMOS and TTL compatible
  • Available in standard DIP-16 and SMD packages
  • Ideal for digital logic and embedded system applications

Shipping & Returns

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Specifications

Specifications:

IC Type: Universal Bi-Directional Shift Register
Part Number: 74HC194
Logic Family: High-Speed CMOS (HC)
Package Type: DIP-16 / SOIC-16 / TSSOP-16 (Variant Dependent)
Register Size: 4 Bits
Operating Modes: Hold, Shift Left, Shift Right, Parallel Load
Operating Voltage: 2V to 6V DC
Recommended Operating Voltage: 5V DC
Maximum Clock Frequency: Up to 25MHz (Typical at 4.5V)
Output Type: Push-Pull CMOS Outputs
Number of Parallel Inputs: 4
Number of Parallel Outputs: 4
Serial Inputs: Shift Left (DSL) and Shift Right (DSR)
Clock Trigger: Positive Edge Triggered
Master Reset: Asynchronous Active LOW
Propagation Delay: Approximately 18ns to 30ns (Typical)
Output Drive Capability: ±5.2mA (Typical at 4.5V)
Operating Temperature: -40°C to +125°C (Device Variant Dependent)
Storage Temperature: -65°C to +150°C
Mounting Type: Through-Hole / Surface Mount
Compatibility: Arduino, ESP32, STM32, Raspberry Pi Pico, FPGA, CPLD, CMOS and TTL Logic Systems

Additional Resources

74HC194.PDF

FAQ

1. What is the 74HC194 IC used for?

The 74HC194 is used for storing, shifting, and transferring digital data in applications such as serial-to-parallel conversion, parallel-to-serial conversion, data buffering, LED display control, and digital communication systems.

2. What operating modes does the 74HC194 support?

The IC supports four operating modes: Hold, Shift Left, Shift Right, and Parallel Load, making it a universal shift register.

3. Can the 74HC194 shift data in both directions?

Yes. The IC includes separate serial inputs for left and right shifting, allowing data to move in either direction under the control of the mode select inputs.

4. What is the purpose of the Master Reset pin?

The Master Reset (MR) pin asynchronously clears all four output bits when driven LOW, regardless of the clock state.

5. Can the 74HC194 be used with Arduino and other microcontrollers?

Yes. The 74HC194 operates from 2V to 6V, making it compatible with Arduino, ESP32, STM32, Raspberry Pi Pico, and other 3.3V or 5V microcontroller platforms for digital data handling and interface expansion.