Encyclopedia Entry: 74AC169SJ

Product Overview

Category

The 74AC169SJ belongs to the category of integrated circuits (ICs) and specifically falls under the family of synchronous counters.

Use

This IC is commonly used in digital electronics for counting and sequencing applications. It provides a convenient solution for implementing binary counters with synchronous load capability.

Characteristics

• Synchronous operation: The 74AC169SJ operates synchronously, allowing precise control over the counting sequence.
• Load capability: It features a synchronous load input that enables the user to load a specific count value into the counter.
• High-speed performance: This IC offers high-speed operation, making it suitable for applications requiring quick counting and sequencing.
• Low power consumption: The 74AC169SJ is designed to consume low power, ensuring energy efficiency in electronic systems.

Package and Quantity

The 74AC169SJ is available in a standard 16-pin dual in-line package (DIP). Each package contains one IC.

Essence

The essence of the 74AC169SJ lies in its ability to provide synchronous counting functionality with load capability, while maintaining high-speed performance and low power consumption.

Specifications

• Supply voltage: 2V to 6V
• Operating temperature range: -40°C to +85°C
• Maximum clock frequency: 100 MHz
• Number of stages: 4-bit binary counter
• Input/output logic levels: CMOS/TTL compatible

Detailed Pin Configuration

The 74AC169SJ has 16 pins, each serving a specific function. Here is the detailed pin configuration:

1. Clock (CLK): Input pin for providing clock pulses to drive the counter.
2. Enable (ENP/ENT): Active-high enable input for enabling or disabling the counter.
3. Parallel Load (PL): Input pin for loading a specific count value into the counter.
4. Data (D0): Input pin for the least significant bit (LSB) of the parallel load data.
5. Data (D1): Input pin for the second least significant bit of the parallel load data.
6. Data (D2): Input pin for the third least significant bit of the parallel load data.
7. Data (D3): Input pin for the most significant bit (MSB) of the parallel load data.
8. Carry Out (CO): Output pin that indicates a carry-out condition when the counter reaches its maximum count value.
9. Down/Up (D/U): Input pin for selecting the counting direction (down or up).
10. Clock Enable (CE): Active-low input for enabling or disabling the clock input.
11. Reset (R): Active-high input for resetting the counter to its initial state. 12-15. Outputs (Q0-Q3): Four output pins representing the binary count value.

Functional Features

The 74AC169SJ offers the following functional features:

1. Synchronous counting: The counter advances its count value synchronously with each clock pulse.
2. Load capability: It allows the user to load a specific count value into the counter using the parallel load input.
3. Count direction control: The D/U input determines whether the counter counts up or down.
4. Carry-out indication: The CO output signals a carry-out condition when the counter reaches its maximum count value.
5. Reset functionality: The R input resets the counter to its initial state.

Advantages and Disadvantages

Advantages

• Precise synchronous counting operation
• Flexible count loading capability
• High-speed performance suitable for time-critical applications
• Low power consumption for energy-efficient designs

Disadvantages

• Limited number of stages (4-bit)
• Requires external clock and control signals for proper operation

Working Principles

The 74AC169SJ operates based on the principles of synchronous counting. When enabled, the counter advances its count value by one with each rising edge of the clock input. The count direction (up or down) is determined by the D/U input. The parallel load input allows the user to load a specific count value into the counter, which is then reflected in the output pins. The CO output indicates a carry-out condition when the maximum count value is reached. The R input resets the counter to its initial state.

Detailed Application Field Plans

The 74AC169SJ finds applications in various digital systems that require counting and sequencing capabilities. Some detailed application field plans include:

1. Digital frequency dividers
2. Event counters in industrial automation
3. Timekeeping circuits
4. Sequential control systems
5. Data communication protocols
6. Programmable logic controllers (PLCs)
7. Electronic gaming devices

Alternative Models

For users seeking alternative options, here are some detailed and complete alternative models to the 74AC169SJ:

1. 74HC169: Similar functionality but operates at a lower voltage range.
2. CD401