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74AC161SC
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Encyclopedia Entry: 74AC161SC

Product Overview

Category

The 74AC161SC belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital counters.

Use

This IC is primarily used for counting purposes in various electronic applications. It can be employed in digital systems where sequential counting is required.

Characteristics

  • The 74AC161SC is a synchronous presettable binary counter.
  • It operates on a supply voltage range of 2V to 6V.
  • This IC offers synchronous counting, meaning all flip-flops within the circuit change state simultaneously.
  • It has a maximum clock frequency of 125 MHz, making it suitable for high-speed applications.
  • The 74AC161SC features a parallel load capability, allowing users to preset the initial count value.
  • It incorporates a carry-out feature, enabling cascading multiple counters for extended counting ranges.

Package and Quantity

The 74AC161SC is available in a small-outline integrated circuit (SOIC) package. It consists of 16 pins arranged in a compact form factor. The IC is typically sold in reels or tubes containing multiple units.

Specifications

  • Supply Voltage Range: 2V to 6V
  • Maximum Clock Frequency: 125 MHz
  • Number of Pins: 16
  • Package Type: SOIC
  • Logic Family: AC

Pin Configuration

The detailed pin configuration of the 74AC161SC IC is as follows:

Pin 1: Clock Enable (CE) Pin 2: Parallel Load (PL) Pin 3: Data Inputs (D0) Pin 4: Data Inputs (D1) Pin 5: Data Inputs (D2) Pin 6: Data Inputs (D3) Pin 7: Carry-In (CI) Pin 8: Down/Up Count Control (U/D) Pin 9: Clock (CLK) Pin 10: Carry-Out (CO) Pin 11: Data Outputs (Q0) Pin 12: Data Outputs (Q1) Pin 13: Data Outputs (Q2) Pin 14: Data Outputs (Q3) Pin 15: Master Reset (MR) Pin 16: VCC (Supply Voltage)

Functional Features

The 74AC161SC offers the following functional features:

  • Synchronous counting: All flip-flops change state simultaneously on each clock pulse.
  • Parallel load capability: Allows users to preset the initial count value using the parallel load input.
  • Down/Up count control: The circuit can be configured to count up or down based on the state of the U/D pin.
  • Carry-in and carry-out functionality: Enables cascading multiple counters for extended counting ranges.
  • Clock enable and master reset inputs: Provide additional control over the counting operation.

Advantages and Disadvantages

Advantages

  • High-speed operation with a maximum clock frequency of 125 MHz.
  • Versatile counting capabilities, including synchronous counting, parallel loading, and up/down counting.
  • Compact SOIC package allows for space-efficient integration into electronic systems.
  • Wide supply voltage range of 2V to 6V provides flexibility in various applications.

Disadvantages

  • Limited number of output bits (4 bits) may restrict its use in applications requiring larger counting ranges.
  • Requires careful consideration of power supply stability due to its high-speed operation.

Working Principles

The 74AC161SC operates as a synchronous binary counter. It utilizes flip-flops to store and propagate the count values. On each clock pulse, the flip-flops change state simultaneously, resulting in synchronous counting. The count value can be preset using the parallel load input, and the direction of counting (up or down) is determined by the U/D pin. The carry-in and carry-out pins allow for cascading multiple counters to achieve extended counting ranges.

Application Field Plans

The 74AC161SC can be applied in various electronic systems that require sequential counting. Some potential application fields include:

  1. Digital frequency dividers
  2. Industrial automation systems
  3. Communication equipment
  4. Automotive electronics
  5. Test and measurement instruments

Alternative Models

For users seeking alternative options, the following ICs can be considered as substitutes for the 74AC161SC:

  1. 74HC161: A similar synchronous binary counter with a lower maximum clock frequency but compatible logic family.
  2. CD40161B: A CMOS-based synchronous presettable counter offering similar functionality.
  3. SN54LS161A: A TTL-compatible synchronous counter with parallel load capability.

These alternative models provide comparable features and can be used as replacements based on specific requirements.

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技術ソリューションにおける 74AC161SC の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of 74AC161SC in technical solutions:

  1. Q: What is the 74AC161SC? A: The 74AC161SC is a synchronous presettable binary counter with an asynchronous reset, commonly used in digital circuits.

  2. Q: What is the maximum clock frequency supported by the 74AC161SC? A: The 74AC161SC can operate at a maximum clock frequency of 125 MHz.

  3. Q: How many bits does the 74AC161SC have? A: The 74AC161SC is a 4-bit counter, meaning it can count up to 16 different states.

  4. Q: Can the 74AC161SC be cascaded to create larger counters? A: Yes, multiple 74AC161SC counters can be cascaded together to create larger counters with more bits.

  5. Q: What is the purpose of the preset inputs on the 74AC161SC? A: The preset inputs allow you to set the initial value of the counter, enabling you to start counting from a specific value.

  6. Q: Does the 74AC161SC support both synchronous and asynchronous reset? A: Yes, the 74AC161SC has both synchronous and asynchronous reset inputs, allowing you to reset the counter either synchronously or asynchronously.

  7. Q: Can the 74AC161SC be used as a frequency divider? A: Yes, by connecting the appropriate outputs of the 74AC161SC to the clock input, you can use it as a frequency divider.

  8. Q: What is the power supply voltage range for the 74AC161SC? A: The 74AC161SC operates with a power supply voltage range of 2V to 6V.

  9. Q: Does the 74AC161SC have any special features for power saving? A: Yes, the 74AC161SC has a low-power consumption mode that can be activated by pulling the enable input low.

  10. Q: Can the 74AC161SC be used in both synchronous and asynchronous applications? A: Yes, the 74AC161SC is versatile and can be used in both synchronous and asynchronous applications, depending on the requirements of the circuit.

Please note that these answers are general and may vary depending on the specific implementation and datasheet of the 74AC161SC.