SN74HC191DRG4

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: 4-bit binary counter with parallel load and asynchronous reset
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 54 MHz
• Number of Counting Stages: 4
• Maximum Count Value: 15 (binary)
• Input/Output Compatibility: TTL (Transistor-Transistor Logic) compatible

Detailed Pin Configuration

1. CP (Clock Pulse) - Clock input for counting operation
2. PL (Parallel Load) - Parallel data input for presetting the counter
3. UP/DN (Up/Down) - Control input for selecting count direction
4. MR (Master Reset) - Asynchronous reset input
5. QA-QD (Q Output) - Binary outputs representing the current count value
6. GND (Ground) - Ground reference
7. QD (Carry Out) - Output indicating a carry-out condition
8. VCC (Supply Voltage) - Positive power supply

Functional Features

• Synchronous Counting: The counter advances on each clock pulse when enabled.
• Parallel Load: Allows presetting the counter to a specific value using the parallel load input.
• Up/Down Control: Selects the count direction, either incrementing or decrementing.
• Asynchronous Reset: Resets the counter to zero regardless of clock or control inputs.
• Carry-Out Output: Indicates a carry-out condition when the maximum count value is reached.

Advantages and Disadvantages

Advantages: - High-speed operation - Synchronous counting ensures accurate results - Flexible count direction control - Asynchronous reset for immediate counter reset

Disadvantages: - Limited maximum count value (15 in this case) - Requires external clock signal and control inputs

Working Principles

The SN74HC191DRG4 is a 4-bit binary counter that can count up or down based on the control input. It operates synchronously, meaning the count advances on each clock pulse when enabled. The counter can be preset to a specific value using the parallel load input. An asynchronous reset input allows for an immediate reset of the counter to zero, regardless of other inputs. The carry-out output indicates a carry-out condition when the maximum count value is reached.

Detailed Application Field Plans

The SN74HC191DRG4 is commonly used in various applications, including: 1. Frequency Division: Dividing an input frequency by a specific factor. 2. Event Counting: Keeping track of the number of occurrences of a particular event. 3. Time Delay Generation: Generating precise time delays in digital circuits. 4. Address Decoding: Selecting specific memory locations or peripheral devices based on the counter's output.

Detailed and Complete Alternative Models

1. CD40193BE: 4-bit synchronous up/down counter with parallel load.
2. MC14516B: 4-bit synchronous up/down counter with asynchronous reset.
3. 74LS193: 4-bit synchronous up/down counter with separate clock and enable inputs.

These alternative models offer similar functionality to the SN74HC191DRG4 and can be used as replacements depending on specific requirements.

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