DM74LS161AM

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: 4-bit synchronous binary counter with asynchronous clear
• Package: 16-pin DIP (Dual In-line Package)
• Essence: High-speed, low-power consumption counter IC
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Number of Counting Stages: 4
• Input Type: Synchronous
• Output Type: Parallel
• Clear Function: Asynchronous

Detailed Pin Configuration

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. CEP (Count Enable Parallel Input)
5. PE (Parallel Enable Input)
6. TC (Terminal Count Output)
7. Q0 (Least Significant Bit Output)
8. Q1 (Output)
9. Q2 (Output)
10. Q3 (Most Significant Bit Output)
11. GND (Ground)
12. QD (Data Input)
13. VCC (Supply Voltage)
14. QA (Output)
15. QB (Output)
16. QC (Output)

Functional Features

• Synchronous counting operation
• Asynchronous clear function
• Parallel enable input for loading data
• Terminal count output for cascading multiple counters
• Low power consumption
• High-speed operation

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient counting in various applications.
• Low power consumption makes it suitable for battery-powered devices.
• Asynchronous clear function provides flexibility in resetting the counter.
• Parallel enable input enables easy loading of data.

Disadvantages

• Limited number of counting stages (4 in this case) may not be sufficient for certain applications requiring higher bit counts.
• Limited operating temperature range (-40°C to +85°C) may restrict usage in extreme environments.

Working Principles

The DM74LS161AM is a 4-bit synchronous binary counter with an asynchronous clear function. It operates based on the clock input (CLK) and counts up or down depending on the count enable inputs (CPD and CEP). The parallel enable input (PE) allows data to be loaded into the counter, while the master reset input (MR) asynchronously clears the counter.

The counter advances on each rising edge of the clock signal when both CPD and CEP are high. When the counter reaches its maximum count value, the terminal count output (TC) goes high, indicating that a full count cycle has been completed.

Detailed Application Field Plans

The DM74LS161AM can be used in various applications that require counting functionality. Some potential application fields include:

1. Digital frequency counters
2. Industrial automation systems
3. Electronic voting machines
4. Traffic light control systems
5. Event timing and sequencing circuits

Detailed and Complete Alternative Models

1. SN74LS161AN: Similar 4-bit synchronous binary counter IC from Texas Instruments.
2. CD74HC161E: High-speed CMOS 4-bit synchronous binary counter IC from Texas Instruments.
3. MC74HC161A: High-speed CMOS 4-bit synchronous binary counter IC from ON Semiconductor.

These alternative models offer similar functionality and can be considered as replacements for the DM74LS161AM in different applications.

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