SN74HC191NSR

Product Overview

Category

SN74HC191NSR belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronic systems for counting and controlling purposes.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Schmitt-trigger inputs for noise immunity
• Synchronous parallel load capability

Package

SN74HC191NSR is available in a small-outline package (SOIC) with 16 pins.

Essence

The essence of SN74HC191NSR lies in its ability to perform synchronous binary up/down counting operations.

Packaging/Quantity

SN74HC191NSR is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Supply Voltage: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Counting Modes: Up, Down, Up/Down, No Change
• Output Current: ±6 mA

Detailed Pin Configuration

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. LOAD (Parallel Load Input)
4. D0-D3 (Data Inputs)
5. GND (Ground)
6. Q0-Q3 (Outputs)
7. RC (Ripple Carry Output)
8. CET (Count Enable Parallel Input)
9. ENT (Enable Tertiary Input)
10. MR (Master Reset Input)
11. VCC (Supply Voltage)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

• Synchronous counting operation
• Asynchronous master reset
• Parallel load capability
• Ripple carry output for cascading multiple counters
• Schmitt-trigger inputs for noise immunity

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient counting in digital systems.
• Low power consumption helps conserve energy.
• Wide operating voltage range provides flexibility in various applications.
• Schmitt-trigger inputs ensure reliable performance in noisy environments.
• Synchronous parallel load capability enables easy initialization of the counter.

Disadvantages

• Limited maximum clock frequency may restrict its use in high-speed applications.
• Output current limitations may require additional buffering for driving external loads.

Working Principles

SN74HC191NSR operates based on synchronous binary up/down counting principles. The CLK input controls the counting direction, while the UP/DOWN input determines whether to count up or down. The LOAD input allows for parallel loading of data into the counter. The outputs provide the current count value, and the ripple carry output facilitates cascading multiple counters.

Detailed Application Field Plans

SN74HC191NSR finds applications in various fields, including: 1. Digital frequency dividers 2. Industrial automation systems 3. Electronic test equipment 4. Automotive electronics 5. Communication systems

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to SN74HC191NSR are: 1. CD40193BE 2. MC74HC191N 3. 74HCT191D 4. CD74HC191E 5. SN74LS191N

These alternatives can be considered based on specific requirements and availability.

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