SN74ALS161BD

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: DIP (Dual In-line Package)
• Essence: Logic IC for counting and frequency division
• Packaging/Quantity: Tube packaging, 25 pieces per tube

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 50 MHz
• Number of Counting Stages: 4
• Output Type: TTL (Transistor-Transistor Logic)
• Input Type: TTL

Detailed Pin Configuration

The SN74ALS161BD has a total of 16 pins, which are assigned 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. QD (Output QD)
9. QC (Output QC)
10. QB (Output QB)
11. QA (Output QA)
12. GND (Ground)
13. VCC (Positive Power Supply)
14. CE (Count Enable Input)
15. CET (Count Enable Trickle Input)
16. TC (Terminal Count Output)

Functional Features

• Synchronous operation with the clock input.
• Can be reset to zero using the master reset input.
• Allows parallel loading of the initial count value.
• Outputs the current count on four output pins.
• Terminal count output indicates when the maximum count value is reached.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting in various applications. - Synchronous design ensures accurate and reliable counting. - Parallel loading capability enables flexibility in initial count values.

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

Working Principles

The SN74ALS161BD is a synchronous counter that operates based on the clock input. Each rising edge of the clock signal increments the counter by one. The master reset input can be used to reset the counter to zero. The count enable input allows the counter to count when enabled, while the count enable trickle input provides additional control for specific applications. The parallel input allows for loading an initial count value. The outputs represent the current count in binary format, with the terminal count output indicating when the maximum count value is reached.

Detailed Application Field Plans

The SN74ALS161BD is commonly used in various applications that require counting and frequency division. Some specific application fields include:

1. Digital frequency dividers
2. Event counters
3. Timekeeping circuits
4. Industrial automation systems
5. Communication equipment

Detailed and Complete Alternative Models

1. SN74ALS163BD: 4-bit synchronous binary counter with asynchronous reset.
2. SN74ALS162BD: 4-bit synchronous binary counter with synchronous reset.
3. SN74ALS164BD: 8-bit serial-in/parallel-out shift register with asynchronous reset.

These alternative models provide similar functionality to the SN74ALS161BD but may have additional features or different pin configurations to suit specific requirements.

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