SN74HC161D

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Digital logic circuit for counting and frequency division
• 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: 50 MHz
• Number of Counting Stages: 4
• Output Type: Synchronous
• Reset Function: Asynchronous

Detailed Pin Configuration

The SN74HC161D has a total of 16 pins. The pin configuration is as follows:

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. A (Binary Input A)
5. B (Binary Input B)
6. C (Binary Input C)
7. D (Binary Input D)
8. GND (Ground)
9. QD (Output QD)
10. QC (Output QC)
11. QB (Output QB)
12. QA (Output QA)
13. VCC (Supply Voltage)
14. CE (Count Enable Input)
15. PE (Parallel Enable Input)
16. TC (Terminal Count Output)

Functional Features

• High-speed operation allows for efficient counting and frequency division.
• Synchronous counting ensures accurate and reliable results.
• Asynchronous master reset allows for immediate resetting of the counter.
• Count enable and parallel enable inputs provide flexibility in controlling the counting process.
• Terminal count output indicates when the counter reaches its maximum value.

Advantages and Disadvantages

Advantages: - High-speed operation enables quick counting and frequency division. - Synchronous counting ensures accurate results. - Asynchronous master reset allows for immediate counter reset. - Flexible control inputs provide versatility in counting applications.

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring higher bit counts. - Requires an external clock signal for operation.

Working Principles

The SN74HC161D is a synchronous 4-bit binary counter. It operates by incrementing its internal count value on each rising edge of the clock input (CLK). The count can be enabled or disabled using the count enable (CE) input. The counter can also be reset to its initial state using the master reset (MR) input.

The binary inputs (A, B, C, D) determine the initial count value when the counter is reset or enabled. The parallel enable (PE) input allows for loading a specific count value into the counter using the count enable parallel (CPD) input.

The counter outputs (QA, QB, QC, QD) represent the current count value. When the counter reaches its maximum value, the terminal count (TC) output is activated.

Detailed Application Field Plans

The SN74HC161D is commonly used in various applications that require counting and frequency division. Some detailed application field plans include:

1. Frequency Dividers: The counter can be used to divide an input clock signal by a specific factor, allowing for frequency reduction or synchronization with other circuits.

2. Event Counters: The counter can be used to count events or pulses, providing a measure of occurrence or duration.

3. Timers: By combining multiple counters and additional logic, the SN74HC161D can be used to implement timers for various timing applications.

4. Digital Control Systems: The counter can be utilized in digital control systems to keep track of states or perform sequential operations.

Detailed and Complete Alternative Models

1. CD40161BE: 4-bit synchronous binary counter with similar specifications and pin configuration.
2. SN74LS161AN: 4-bit synchronous binary counter with different package type (DIP) but similar functionality.
3. CD74HC161E: 4-bit high-speed synchronous binary counter with similar characteristics and pin configuration.

These alternative models provide similar functionality to the SN74HC161D and can be used as replacements depending on specific requirements.

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