SN74AS161NSR

Product Overview

• Category: Integrated Circuit
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: A versatile counter chip used in various digital applications
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Number of Counting Stages: 4
• Output Type: Synchronous Binary
• Logic Family: Advanced Schottky (AS)

Detailed Pin Configuration

The SN74AS161NSR has a total of 16 pins, each serving a specific function:

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. P0 (Parallel Data Input)
5. P1 (Parallel Data Input)
6. P2 (Parallel Data Input)
7. P3 (Parallel Data Input)
8. Q0 (Least Significant Bit Output)
9. Q1 (Output)
10. Q2 (Output)
11. Q3 (Most Significant Bit Output)
12. GND (Ground)
13. VCC (Positive Power Supply)
14. CE (Count Enable Input)
15. TC (Terminal Count Output)
16. RC (Ripple Carry Output)

Functional Features

• Synchronous operation with a common clock input
• Can be cascaded for larger counting applications
• Reset capability to initialize the counter
• Parallel load capability for presetting the counter value
• Terminal count output for indicating when the maximum count is reached

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting in time-critical applications - Synchronous design ensures accurate and reliable counting - Versatile chip suitable for various digital applications

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring larger counters - Requires external components for clock generation and input/output interfacing

Working Principles

The SN74AS161NSR is a synchronous counter that counts up from zero to its maximum value (15 in this case) based on the clock input. The counter can be reset to zero using the master reset input (MR). It can also be preset to a specific value using the parallel data inputs (P0-P3) and the count enable parallel input (CPD).

The counter advances by one on each rising edge of the clock signal when the count enable input (CE) is high. When the counter reaches its maximum value, the terminal count output (TC) goes high, indicating that the maximum count has been reached. The ripple carry output (RC) can be used to cascade multiple counters for larger counting applications.

Detailed Application Field Plans

The SN74AS161NSR finds application in various digital systems where counting is required. Some common application fields include:

1. Digital frequency dividers
2. Event counters in electronic circuits
3. Timekeeping circuits
4. Industrial automation systems
5. Traffic light control systems
6. Programmable logic controllers (PLCs)
7. Electronic gaming devices

Detailed and Complete Alternative Models

1. SN74LS161N: Similar 4-bit synchronous binary counter with lower power consumption.
2. CD40161BE: 4-bit synchronous up/down counter with additional up/down control capability.
3. MC14516B: 4-bit synchronous programmable counter with parallel load capability.

These alternative models offer similar functionality but may have different specifications and pin configurations. It is important to refer to their respective datasheets for detailed information.

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