Encyclopedia Entry: 74AC191SJX

Product Overview

Use

This IC is commonly used in digital electronic systems for various applications, such as counters and registers.

Characteristics

The 74AC191SJX is a synchronous up/down binary counter.
It operates on a wide voltage range, typically between 2V and 6V.
This IC has a high-speed operation, making it suitable for time-critical applications.
It offers low power consumption, making it energy-efficient.
The 74AC191SJX is designed with advanced CMOS technology, ensuring reliable performance.

Package and Quantity

The 74AC191SJX is available in a small outline package (SOP) with a specific pin configuration. Each package contains one IC.

Specifications

Supply Voltage Range: 2V to 6V
Operating Temperature Range: -40°C to +85°C
Maximum Clock Frequency: 100 MHz
Number of Counting Bits: 4
Logic Family: Advanced CMOS (AC)

Detailed Pin Configuration

The 74AC191SJX has a total of 16 pins, each serving a specific function. Here is the detailed pin configuration:

CP (Clock Pulse): Input pin for clock signal.
MR (Master Reset): Input pin for resetting the counter.
U/D (Up/Down): Input pin for selecting count direction.
D0-D3 (Data Inputs): Input pins for setting the initial count value.
Q0-Q3 (Outputs): Output pins representing the current count value.
RC (Ripple Carry): Output pin for cascading multiple counters.
GND (Ground): Reference ground for the IC.
VCC (Supply Voltage): Positive power supply for the IC.

Functional Features

Synchronous Operation: The 74AC191SJX performs counting operations synchronously with the clock signal.
Up/Down Counting: It can count up or down based on the input provided to the U/D pin.
Parallel Load: The initial count value can be loaded through the D0-D3 pins.
Ripple Carry Output: The RC pin allows cascading multiple counters for higher bit counts.
Asynchronous Reset: The MR pin resets the counter to a predefined state when activated.

Advantages and Disadvantages

Advantages: - Wide voltage range allows compatibility with various systems. - High-speed operation enables time-critical applications. - Low power consumption ensures energy efficiency. - Advanced CMOS technology provides reliable performance.

Disadvantages: - Limited number of counting bits (4 in this case). - Requires external components for complete functionality in some applications.

Working Principles

The 74AC191SJX operates based on synchronous counting principles. When the clock pulse is received, the counter increments or decrements its count value based on the input provided to the U/D pin. The current count value is stored in the Q0-Q3 output pins. The counter can be reset asynchronously using the MR pin. The RC pin allows cascading multiple counters to achieve higher bit counts.

Detailed Application Field Plans

The 74AC191SJX finds applications in various digital electronic systems, including: 1. Digital frequency dividers 2. Event counters 3. Industrial automation systems 4. Communication equipment 5. Automotive electronics

Detailed Alternative Models

For similar functionalities, alternative models to the 74AC191SJX include: 1. 74HC191: A high-speed CMOS version with similar characteristics. 2. CD40193: A complementary metal-oxide-semiconductor (CMOS) version with 4-bit synchronous up/down counters. 3. SN74LS191: A low-power Schottky version with similar functionality.

In conclusion, the 74AC191SJX is a versatile integrated circuit used in digital electronic systems for counting and register applications. Its high-speed operation, wide voltage range, and low power consumption make it suitable for various industries. However, its limited number of counting bits and external component requirements may be considered as disadvantages in certain applications.

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Listen Sie 10 häufige Fragen und Antworten im Zusammenhang mit der Anwendung von 74AC191SJX in technischen Lösungen auf

Sure! Here are 10 common questions and answers related to the application of 74AC191SJX in technical solutions:

Q: What is the purpose of the 74AC191SJX? A: The 74AC191SJX is a synchronous up/down counter that can be used in various applications requiring counting or sequencing.
Q: What is the maximum clock frequency supported by the 74AC191SJX? A: The 74AC191SJX can operate at a maximum clock frequency of 100 MHz.
Q: Can the 74AC191SJX be used as a binary counter? A: Yes, the 74AC191SJX can function as a binary counter, where it counts in binary sequence from 0 to 15 (or any other desired range).
Q: How many bits does the 74AC191SJX have? A: The 74AC191SJX is a 4-bit counter, meaning it has four output bits that represent the count value.
Q: Can the 74AC191SJX count both up and down? A: Yes, the 74AC191SJX has separate up and down count inputs, allowing it to count in both directions.
Q: What is the maximum count value that the 74AC191SJX can reach? A: The 74AC191SJX can count up to a maximum value of 15 (1111 in binary) before rolling over to 0.
Q: Does the 74AC191SJX have any asynchronous inputs? A: No, the 74AC191SJX is a synchronous counter, meaning all inputs are synchronized with the clock signal.
Q: Can the 74AC191SJX be cascaded to create larger counters? A: Yes, multiple 74AC191SJX counters can be cascaded together to create larger counters with more bits.
Q: What is the power supply voltage range for the 74AC191SJX? A: The 74AC191SJX operates with a power supply voltage range of 2V to 6V.
Q: Are there any special considerations for clock signal timing in the 74AC191SJX? A: Yes, the 74AC191SJX requires proper setup and hold times for the clock signal to ensure reliable operation. These timings are specified in the datasheet and should be followed carefully.

Please note that these answers are general and may vary depending on specific implementation details and requirements. Always refer to the datasheet and relevant documentation for accurate information.