SN74ALS191AD

Product Overview

Category

SN74ALS191AD belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as counters, registers, and arithmetic logic units.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• TTL compatible inputs
• Schottky-clamped inputs for improved noise immunity

Package

SN74ALS191AD is available in a 16-pin dual in-line package (DIP).

Essence

The essence of SN74ALS191AD lies in its ability to perform efficient counting and data manipulation operations in digital systems.

Packaging/Quantity

SN74ALS191AD is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Number of Counting Stages: 4
• Output Current: ±8 mA

Detailed Pin Configuration

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. CPD (Count Enable Parallel Input)
4. CTEN (Count Enable Input)
5. QA (Output A)
6. QB (Output B)
7. QC (Output C)
8. QD (Output D)
9. GND (Ground)
10. VCC (Supply Voltage)
11. CE (Carry Enable Output)
12. CET (Carry Enable Input)
13. PE (Preset Enable Input)
14. P (Preset Input)
15. TC (Terminal Count Output)
16. RC (Ripple Carry Output)

Functional Features

• Synchronous parallel loading of initial count value
• Asynchronous master reset
• Synchronous counting on positive clock edge
• Carry output for cascading multiple counters
• Terminal count output indicating the completion of a full count cycle

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data processing.
• Low power consumption makes it suitable for battery-powered devices.
• Wide operating voltage range provides flexibility in various applications.
• TTL compatible inputs ensure compatibility with other digital logic circuits.
• Schottky-clamped inputs enhance noise immunity, improving overall system reliability.

Disadvantages

• Limited number of counting stages (4 in this case) may restrict its use in complex applications requiring higher counts.
• Lack of built-in error detection or correction mechanisms may require additional circuitry for fault tolerance.

Working Principles

SN74ALS191AD operates based on synchronous binary counting principles. The clock input triggers the counter to increment its count value by one on each positive edge. The count can be preset using the parallel load inputs, and the counter can be reset to its initial state using the master reset input. The carry output enables cascading multiple counters to achieve larger counting ranges.

Detailed Application Field Plans

SN74ALS191AD finds applications in various fields, including: 1. Digital frequency dividers 2. Event counters 3. Industrial automation systems 4. Communication equipment 5. Automotive electronics 6. Test and measurement instruments

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to SN74ALS191AD are: 1. CD40193 - CMOS 4-Bit Binary Up/Down Counter 2. 74HC191 - High-Speed CMOS 4-Bit Synchronous Up/Down Counters 3. CD54/74AC191 - Presettable Synchronous 4-Bit Binary Up/Down Counters

These alternatives provide comparable features and can be used as replacements depending on specific requirements.

In conclusion, SN74ALS191AD is a versatile integrated circuit used for counting and data manipulation in digital systems. Its high-speed operation, low power consumption, and wide operating voltage range make it suitable for various applications. However, its limited number of counting stages and lack of built-in error detection may pose limitations in certain scenarios. Nonetheless, with its functional features and compatibility, SN74ALS191AD serves as a reliable component in numerous fields, including industrial automation, communication, and automotive electronics.