SN74ALS161BNSR

Product Overview

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

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Clock Frequency: 125 MHz
• Number of Counting Stages: 4
• Logic Family: ALS (Advanced Low-Power Schottky)

Detailed Pin Configuration

The SN74ALS161BNSR has a total of 16 pins, which are assigned specific functions as follows:

1. CLK (Pin 1): Clock input for counting operation
2. MR (Pin 2): Master Reset input, resets the counter to zero
3. CPD (Pin 3): Clock Enable input, disables clock when low
4. PE (Pin 4): Parallel Enable input, enables parallel loading of data
5. QA-QD (Pins 5-8): Outputs representing the binary count value
6. GND (Pins 9, 10): Ground reference
7. QD (Pin 11): Carry output, indicates overflow condition
8. VCC (Pin 16): Positive power supply

Functional Features

• Synchronous operation: The counter advances on each rising edge of the clock signal.
• Parallel load capability: Allows loading of a preset value into the counter using the parallel enable input.
• Carry output: Indicates an overflow condition when the counter reaches its maximum value.
• Master reset: Resets the counter to zero when the master reset input is activated.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting in time-critical applications. - Synchronous design ensures accurate and reliable counting. - Versatile functionality makes it suitable for a wide range of digital applications.

Disadvantages: - Limited number of counting stages (4 bits) may not be sufficient for certain complex applications. - Requires an external clock signal for proper operation.

Working Principles

The SN74ALS161BNSR is a synchronous counter that utilizes flip-flops to store and propagate the count value. On each rising edge of the clock signal, the counter advances by one count. The parallel enable input allows loading of a preset value into the counter, while the master reset input resets the counter to zero. The carry output indicates an overflow condition when the counter reaches its maximum value.

Detailed Application Field Plans

The SN74ALS161BNSR can be used in various digital applications, including but not limited to:

1. Frequency division: Dividing an input clock frequency by a specific factor.
2. Event counting: Keeping track of the number of occurrences of a particular event.
3. Time measurement: Measuring the duration of a specific time interval.
4. Digital displays: Driving 7-segment displays or other numerical display devices.
5. Control systems: Implementing sequential logic in control circuits.

Detailed and Complete Alternative Models

1. SN74ALS163BNSR: Similar to SN74ALS161BNSR, but with additional asynchronous load capability.
2. CD40161BE: A CMOS version of the 4-bit synchronous binary counter.
3. MC14060BCL: A ripple-carry binary counter with similar functionality.

These alternative models offer similar functionalities and can be considered as alternatives to the SN74ALS161BNSR depending on specific requirements and design constraints.

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