MM74C90N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics:
  • 4-bit binary counter
  • Divide-by-N counter
  • Decade counter
• Package: DIP (Dual In-line Package)
• Essence: The MM74C90N is a versatile counter IC that can be used in various applications requiring counting functionality.
• Packaging/Quantity: Available in packs of 10 or 25 units.

Specifications

• Supply Voltage: 5V
• Maximum Clock Frequency: 30 MHz
• Number of Counting Stages: 4
• Output Current: 6 mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MM74C90N has a total of 14 pins, each serving a specific purpose. Here is the detailed pin configuration:

1. VCC: Positive power supply terminal
2. GND: Ground terminal
3. Clock Input (CLK): Provides clock signal for counting operation
4. Reset Input (MR): Resets the counter to zero when activated
5. Enable Input (EN): Enables or disables the counting operation
6. Output A (QA): Least significant bit (LSB) output
7. Output B (QB): Second least significant bit output
8. Output C (QC): Third least significant bit output
9. Output D (QD): Most significant bit (MSB) output
10. Carry Output (CO): Generates a carry signal when the counter reaches its maximum value
11. Ripple Clock Output (RCO): Provides a ripple clock output for cascading multiple counters 12-14. Not Connected (NC): Unused pins

Functional Features

• Binary Counting: The MM74C90N is capable of counting in binary format, allowing for a wide range of applications.
• Decade Counting: The counter can also be configured to count in decades, making it suitable for applications requiring decade-based counting.
• Divide-by-N Counting: By setting the appropriate values for N, the MM74C90N can divide the input clock frequency by N, providing flexibility in frequency division applications.
• Reset Functionality: The counter can be reset to zero using the Reset Input (MR), allowing for easy initialization.
• Enable/Disable Operation: The Enable Input (EN) allows the user to enable or disable the counting operation as needed.

Advantages and Disadvantages

Advantages

• Versatile functionality with multiple counting modes
• Easy to use and integrate into various circuits
• Compact DIP package for easy soldering and handling
• Wide operating temperature range for diverse environments

Disadvantages

• Limited number of counting stages (4 bits)
• Requires an external clock signal for operation
• Not suitable for high-frequency applications

Working Principles

The MM74C90N operates based on the principle of synchronous counting. When a clock signal is applied to the CLK input, the counter increments its value by one. The carry output (CO) generates a carry signal when the maximum count value is reached, allowing for cascading multiple counters if required. The counter can be reset to zero using the Reset Input (MR). The Enable Input (EN) enables or disables the counting operation.

Detailed Application Field Plans

The MM74C90N finds applications in various fields where counting functionality is required. Some of the detailed application field plans include:

1. Digital frequency dividers
2. Event counters
3. Industrial automation systems
4. Traffic light control systems
5. Electronic games and toys
6. Timekeeping circuits
7. Frequency synthesizers
8. Digital clocks and timers

Detailed and Complete Alternative Models

• CD4017: 10-stage Johnson counter with decoded outputs
• SN74LS93: 4-bit binary ripple counter
• CD4020: 14-stage binary counter/divider

These alternative models offer similar functionality to the MM74C90N and can be considered as alternatives based on specific requirements.

In conclusion, the MM74C90N is a versatile 4-bit binary counter IC that offers various counting modes and can be used in a wide range of applications. Its compact package, ease of use, and multiple functional features make it a popular choice among electronics enthusiasts and professionals alike.

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