CD74HC194E

Product Overview

• Category: Integrated Circuit (IC)
• Use: Shift Register
• Characteristics: High-speed operation, low power consumption
• Package: DIP (Dual In-line Package)
• Essence: 4-bit Bidirectional Universal Shift Register
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Clock Frequency: 25 MHz
• Operating Temperature Range: -55°C to +125°C

Detailed Pin Configuration

The CD74HC194E has a total of 16 pins, which are assigned as follows:

1. QA: Output of the first flip-flop
2. QB: Output of the second flip-flop
3. QC: Output of the third flip-flop
4. QD: Output of the fourth flip-flop
5. MR: Master Reset input
6. CP: Clock Pulse input
7. DS: Serial Data input
8. SH/LD: Shift/Load control input
9. OE: Output Enable input
10. GND: Ground
11. QH: Output of the last flip-flop
12. SER OUT: Serial Output
13. QA*: Complement of QA output
14. QB*: Complement of QB output
15. QC*: Complement of QC output
16. VCC: Positive Power Supply

Functional Features

• Bidirectional shifting: The CD74HC194E can shift data in both directions, allowing for versatile data manipulation.
• Parallel loading: The shift register can be loaded with parallel data using the Shift/Load control input.
• Master Reset: The Master Reset input allows for clearing the register to a known state.
• Output Enable: The Output Enable input enables or disables the outputs of the shift register.

Advantages and Disadvantages

Advantages: - High-speed operation: The CD74HC194E operates at a maximum clock frequency of 25 MHz, making it suitable for high-speed applications. - Low power consumption: The IC consumes low power, making it energy-efficient.

Disadvantages: - Limited number of bits: The CD74HC194E is a 4-bit shift register, which may not be sufficient for certain applications requiring larger data storage.

Working Principles

The CD74HC194E is based on flip-flop circuits that store and shift data. It utilizes clock pulses to move data through the register in either direction. The Shift/Load control input determines whether the data is shifted or loaded in parallel. The Master Reset input resets the register to a known state, and the Output Enable input controls the output stage.

Detailed Application Field Plans

The CD74HC194E is commonly used in various applications, including:

1. Serial-to-parallel conversion: Converting serial data into parallel format for further processing.
2. Data storage and retrieval: Storing and retrieving data in microcontrollers and digital systems.
3. Arithmetic operations: Performing arithmetic operations by shifting and manipulating binary data.
4. LED matrix control: Controlling LED matrices by shifting data to display patterns or characters.

Detailed and Complete Alternative Models

1. SN74HC194N: Similar 4-bit bidirectional universal shift register from Texas Instruments.
2. MC74HC194AN: Equivalent 4-bit shift register from ON Semiconductor.
3. CD4015BE: Dual 4-bit static shift register from Texas Instruments.

These alternative models offer similar functionality and can be used as replacements for the CD74HC194E in various applications.

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