CD74HC191M

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-Speed, CMOS Logic, Synchronous Operation
• Package: 16-Pin SOIC (Small Outline Integrated Circuit)
• Essence: The CD74HC191M is a high-speed CMOS logic counter/divider IC that operates synchronously. It is commonly used in digital circuits for counting and dividing signals.
• Packaging/Quantity: The CD74HC191M is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Number of Stages: 4-Bit Binary Counter
• Output Type: Synchronous Output
• Logic Family: HC (High-Speed CMOS)

Detailed Pin Configuration

The CD74HC191M has a total of 16 pins. Here is the detailed pin configuration:

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. P0 (Parallel Data Input)
5. P1 (Parallel Data Input)
6. P2 (Parallel Data Input)
7. P3 (Parallel Data Input)
8. Q0 (Least Significant Bit Output)
9. Q1 (Output)
10. Q2 (Output)
11. Q3 (Most Significant Bit Output)
12. GND (Ground)
13. CARRY OUT (Carry Output)
14. ENT (Enable Counting Input)
15. VCC (Positive Power Supply)
16. RC (Ripple Clock Output)

Functional Features

• Synchronous operation allows precise control over counting and dividing signals.
• Master Reset input (MR) allows resetting the counter to its initial state.
• Count Enable Parallel input (CPD) enables or disables parallel counting.
• Parallel Data inputs (P0-P3) allow presetting the initial count value.
• Carry Output (CARRY OUT) indicates when the counter reaches its maximum value.
• Enable Counting input (ENT) controls whether the counter counts or holds its current value.

Advantages and Disadvantages

Advantages: - High-speed operation suitable for time-critical applications. - CMOS logic provides low power consumption. - Synchronous operation ensures accurate counting/dividing.

Disadvantages: - Limited number of stages (4-bit), restricting the maximum count value. - Requires external clock signal for operation.

Working Principles

The CD74HC191M operates based on synchronous counting principles. The CLK input serves as the clock signal, which triggers the counter to increment its count value. The counter can be reset to its initial state using the MR input. The CPD input enables or disables parallel counting, while the P0-P3 inputs allow presetting the initial count value. The counter outputs the current count value through the Q0-Q3 pins. The CARRY OUT pin indicates when the counter reaches its maximum value. The ENT input controls whether the counter counts or holds its current value.

Detailed Application Field Plans

The CD74HC191M is commonly used in various digital circuits that require counting or dividing signals. Some specific application fields include:

1. Frequency Dividers: The CD74HC191M can be used to divide high-frequency signals into lower frequencies required by other components in a circuit.
2. Timers and Counters: It can be utilized in timer circuits or as a basic building block for more complex counters.
3. Digital Clocks: The CD74HC191M can be employed in digital clock circuits to keep track of time and display it accurately.
4. Industrial Automation: It finds applications in industrial automation systems for counting and controlling processes.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the CD74HC191M include:

1. CD4017: A decade counter/divider IC with 10 outputs, suitable for various counting applications.
2. CD4020: A 14-stage binary counter IC with a built-in oscillator, commonly used for frequency division.
3. CD4518: A dual BCD up-counter IC with presettable counters, ideal for applications requiring multiple counters.

These alternative models can be considered based on specific requirements and desired features.

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