Encyclopedia Entry: 74F191PC

Product Overview

Category

The 74F191PC is a digital integrated circuit (IC) belonging to the category of synchronous counters.

Use

This IC is primarily used for counting and controlling operations in various electronic devices and systems.

Characteristics

• Synchronous operation: The 74F191PC operates synchronously with an external clock signal, ensuring accurate counting.
• High-speed performance: This IC is designed to operate at high clock frequencies, making it suitable for applications requiring fast counting operations.
• Versatile functionality: The 74F191PC offers multiple counting modes, including up, down, and reversible counting, providing flexibility for different applications.
• Low power consumption: Despite its high-speed performance, this IC is designed to consume minimal power, making it energy-efficient.

Package and Quantity

The 74F191PC is available in a standard dual in-line package (DIP), which consists of 16 pins. It is commonly sold in packs of 10 units.

Specifications

• Supply voltage: 4.5V to 5.5V
• Operating temperature range: -40°C to +85°C
• Maximum clock frequency: 25 MHz
• Maximum count value: 15 (4-bit binary)

Pin Configuration

The 74F191PC has 16 pins arranged as follows:

```

---

| | | 1 2 3 4 5 6 7 8 | | | | 16 15 14 13 12 11 10 9 | | |

---

```

Pin descriptions: 1. MR (Master Reset) 2. CP (Clock Pulse) 3. PE (Parallel Enable) 4. U/D (Up/Down Control) 5. D0 (Data Input 0) 6. D1 (Data Input 1) 7. D2 (Data Input 2) 8. D3 (Data Input 3) 9. Q0 (Output Bit 0) 10. Q1 (Output Bit 1) 11. Q2 (Output Bit 2) 12. Q3 (Output Bit 3) 13. TC (Terminal Count) 14. GND (Ground) 15. VCC (Supply Voltage) 16. NC (No Connection)

Functional Features

• Synchronous counting: The 74F191PC performs counting operations based on the clock pulses received, ensuring accurate and synchronized results.
• Parallel load capability: It allows loading of initial count values in parallel, facilitating easy initialization of the counter.
• Up/Down control: The U/D pin determines the counting direction, enabling both up and down counting modes.
• Terminal count output: The TC pin provides a signal indicating when the maximum count value has been reached, allowing for efficient control of subsequent operations.

Advantages and Disadvantages

Advantages: - High-speed operation enables rapid counting applications. - Versatile counting modes provide flexibility for different use cases. - Low power consumption contributes to energy efficiency.

Disadvantages: - Limited maximum count value restricts its applicability in certain scenarios. - Availability in DIP package may limit compatibility with modern surface-mount technology.

Working Principles

The 74F191PC operates as a synchronous counter by utilizing flip-flops to store and propagate binary information. The counter advances its count value based on the clock pulses received, with the direction determined by the U/D control input. The terminal count output signals when the maximum count value is reached.

Application Field Plans

The 74F191PC finds application in various fields, including: - Digital frequency dividers - Industrial automation systems - Electronic test equipment - Communication devices - Automotive electronics

Alternative Models

Other alternative models that offer similar functionality to the 74F191PC include: - 74LS191 - CD40193 - SN74LS192

In conclusion, the 74F191PC is a versatile synchronous counter IC with high-speed performance and various counting modes. Its compact DIP package and low power consumption make it suitable for a wide range of applications in different industries.

Word Count: 490