DM74ALS161BM

Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: High-speed, synchronous, 4-bit binary counter
• Package: 16-pin DIP (Dual In-line Package)
• Essence: Logic circuitry for counting binary numbers
• Packaging/Quantity: Typically sold in reels or tubes of 25 pieces

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 100 MHz
• Number of Counting Stages: 4
• Output Type: TTL (Transistor-Transistor Logic)
• Input Type: TTL-compatible

Detailed Pin Configuration

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 (Supply Voltage)
14. CE (Count Enable Input)
15. TC (Terminal Count Output)
16. NC (No Connection)

Functional Features

• Synchronous operation with a common clock input (CLK)
• Can be reset to a predetermined state using the master reset input (MR)
• Allows parallel loading of data into the counter using the count enable parallel input (CPD) and parallel data inputs (P0-P3)
• Outputs the current count value on four output pins (Q0-Q3)
• Generates a terminal count output (TC) when the counter reaches its maximum value

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 easy initialization of the counter - TTL-compatible inputs and outputs facilitate integration with other logic circuits

Disadvantages: - Limited to 4-bit counting, which may not be sufficient for certain applications requiring larger counters - Requires an external clock signal for operation - Limited temperature range of -40°C to +85°C may restrict usage in extreme environments

Working Principles

The DM74ALS161BM is a synchronous 4-bit binary counter that utilizes flip-flops and combinational logic to perform counting operations. The counter advances its count value on each rising edge of the clock input (CLK) when the count enable input (CE) is high. The master reset input (MR) can be used to reset the counter to a predetermined state.

Parallel data inputs (P0-P3) allow for loading a specific count value into the counter when the count enable parallel input (CPD) is high. The current count value is available on the output pins (Q0-Q3), with Q0 being the least significant bit and Q3 being the most significant bit. When the counter reaches its maximum value, a terminal count output (TC) is generated.

Detailed Application Field Plans

The DM74ALS161BM is commonly used in various applications that require counting functionality. Some potential application fields include:

1. Digital frequency dividers
2. Event counters in electronic devices
3. Industrial automation systems
4. Communication equipment
5. Automotive electronics
6. Test and measurement instruments

Detailed and Complete Alternative Models

1. SN74LS161N: Similar 4-bit synchronous binary counter from Texas Instruments
2. CD54/74HC161: 4-bit high-speed synchronous counter from Texas Instruments
3. MC74HC161A: High-speed CMOS 4-bit synchronous counter from ON Semiconductor
4. CD40161B: CMOS presettable 4-bit binary up/down counter from Texas Instruments

These alternative models offer similar functionality and can be considered as alternatives to the DM74ALS161BM.

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