CD74HCT4520E

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Divider
• Characteristics: High-speed, CMOS logic, dual 4-bit binary up/down counter
• Package: 16-pin DIP (Dual In-line Package)
• Essence: A versatile counter/divider IC with up/down functionality
• Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 units

Specifications

• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -55°C to +125°C
• Maximum Clock Frequency: 25 MHz
• Counting Modes: Up, Down, and Up/Down
• Output Type: TTL compatible
• Number of Pins: 16

Detailed Pin Configuration

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. LOAD (Parallel Load Input)
4. MR (Master Reset Input)
5. Q0 (Least Significant Bit Output)
6. Q1 (Output)
7. Q2 (Output)
8. Q3 (Most Significant Bit Output)
9. GND (Ground)
10. VCC (Supply Voltage)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

• Dual 4-bit binary up/down counter with separate clock inputs for each counter
• Can be configured as a single 8-bit up/down counter
• Parallel load capability for easy initialization of the counter
• Master reset input for synchronous reset of all counters
• Outputs are TTL compatible for easy interfacing with other logic devices
• High-speed operation with a maximum clock frequency of 25 MHz

Advantages and Disadvantages

Advantages

• Versatile counter/divider IC suitable for various applications
• High-speed operation allows for efficient counting and dividing tasks
• TTL compatible outputs simplify integration with other logic devices
• Parallel load capability enables easy initialization of the counter

Disadvantages

• Limited to 4-bit counting, may not be suitable for applications requiring higher bit counts
• Requires external clock and control signals for proper operation
• Not suitable for low-power or battery-operated devices due to relatively high power consumption

Working Principles

The CD74HCT4520E is a dual 4-bit binary up/down counter that can operate in three different counting modes: up, down, and up/down. The counter advances or decreases its count based on the clock input and the state of the up/down control input. The parallel load input allows for the initialization of the counter by loading a specific value into it.

The counter's outputs represent the current count value in binary form, with Q0 being the least significant bit and Q3 being the most significant bit. These outputs can be used to drive external circuitry or to provide feedback within the system.

Detailed Application Field Plans

The CD74HCT4520E is commonly used in various applications that require counting or dividing functionality. Some of the typical application fields include:

1. Frequency Division: The IC can be used to divide an input clock signal by a specific factor, allowing for frequency reduction or synchronization with other components.
2. Event Counting: It can be employed to count events or pulses generated by sensors, switches, or other digital signals.
3. Timing and Control: The counter can be utilized in timing circuits, where precise time intervals need to be measured or controlled.
4. Digital Communication Systems: It finds application in digital communication systems for tasks such as data packetization, synchronization, and channel allocation.

Detailed and Complete Alternative Models

1. CD74HCT4017E: 10-stage Johnson counter with 10 decoded outputs
2. CD74HCT163E: Synchronous 4-bit binary counter with parallel load capability
3. CD74HCT191E: Synchronous 4-bit up/down binary counter with parallel load capability
4. CD74HCT393E: Dual 4-bit binary ripple counter with separate clock inputs

These alternative models offer similar functionality to the CD74HCT4520E and can be considered as alternatives based on specific requirements.

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