Encyclopedia Entry: 74AC191PC

Product Overview

Category

The 74AC191PC belongs to the category of integrated circuits (ICs), specifically digital counters.

Use

This IC is commonly used in digital systems for counting and controlling purposes. It can be employed in various applications that require precise counting and sequencing operations.

Characteristics

• The 74AC191PC is a synchronous, presettable, 4-bit binary up/down counter.
• It operates on a wide voltage range, typically between 2V and 6V.
• This IC offers high-speed operation, making it suitable for time-critical applications.
• It has a compact package size, allowing for easy integration into electronic circuits.

Package and Quantity

The 74AC191PC is available in a 16-pin DIP (Dual In-line Package) format. It is commonly sold in packs of multiple units, with quantities varying based on the supplier.

Specifications

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

Detailed Pin Configuration

The 74AC191PC features 16 pins, each serving a specific function. Here is a detailed pin configuration:

1. MR (Master Reset)
2. CPD (Count Enable Parallel Load)
3. CP0 (Clock Pulse Input)
4. CP1 (Clock Pulse Input)
5. CP2 (Clock Pulse Input)
6. CP3 (Clock Pulse Input)
7. ENT0 (Enable Up/Down)
8. ENT1 (Enable Up/Down)
9. LD (Parallel Load Input)
10. Q0 (Output Bit 0)
11. Q1 (Output Bit 1)
12. Q2 (Output Bit 2)
13. Q3 (Output Bit 3)
14. GND (Ground)
15. VCC (Supply Voltage)
16. RC (Ripple Clock Output)

Functional Features

• The 74AC191PC can count up or down based on the input signals.
• It supports parallel loading of preset values for immediate counting from a specific starting point.
• This IC offers synchronous operation, ensuring accurate and reliable counting.
• It features a ripple clock output that can be used to cascade multiple counters.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient counting in time-critical applications.
• Synchronous design ensures precise and synchronized counting.
• Compact package size allows for easy integration into electronic circuits.

Disadvantages

• Limited counting range due to its 4-bit configuration.
• Requires additional circuitry for more complex counting operations.

Working Principles

The 74AC191PC operates based on the principles of synchronous digital counting. It utilizes clock pulses and control inputs to increment or decrement the count value. The parallel load feature allows presetting the initial count value, while the enable inputs determine the direction of counting.

Detailed Application Field Plans

The 74AC191PC finds applications in various fields where accurate counting and sequencing are required. Some potential application areas include: - Digital frequency dividers - Industrial automation systems - Electronic test equipment - Communication devices - Automotive electronics

Alternative Models

There are several alternative models available that offer similar functionality to the 74AC191PC. Some notable alternatives include: - 74HC191: A CMOS version with a wider supply voltage range. - CD40192: A complementary metal-oxide-semiconductor (CMOS) counter with additional features. - SN74LS191: A low-power Schottky TTL (Transistor-Transistor Logic) counter.

In conclusion, the 74AC191PC is a versatile and reliable 4-bit binary up/down counter IC. Its high-speed operation, synchronous design, and compact package make it suitable for various counting and control applications in digital systems.

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