CD74HCT191M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter
• Characteristics: High-speed, CMOS logic, synchronous operation
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: The CD74HCT191M is a high-speed synchronous up/down counter IC that can count up or down depending on the control inputs.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 25 MHz
• Number of Counting Bits: 4
• Counting Modes: Up, Down, Up/Down
• Output Type: TTL compatible

Detailed Pin Configuration

The CD74HCT191M has 16 pins arranged as follows:

1. CLK (Clock Input)
2. UP/DOWN (Up/Down Control Input)
3. LOAD (Load Control Input)
4. ENABLE (Enable Control Input)
5. A (Least Significant Bit)
6. B
7. C
8. D (Most Significant Bit)
9. GND (Ground)
10. QD (Least Significant Bit Output)
11. QC
12. QB
13. QA (Most Significant Bit Output)
14. RC (Ripple Carry Output)
15. MR (Master Reset Input)
16. VCC (Supply Voltage)

Functional Features

• Synchronous operation ensures accurate counting with the clock signal.
• Can count up or down based on the UP/DOWN control input.
• Load control input allows loading of preset values into the counter.
• Enable control input enables or disables the counter.
• Ripple carry output provides a carry signal for cascading multiple counters.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting. - CMOS logic provides low power consumption. - Synchronous operation ensures accurate counting.

Disadvantages: - Limited number of counting bits (4 in this case). - Requires external clock signal for operation.

Working Principles

The CD74HCT191M operates based on the principle of synchronous counting. The counter advances or decreases its count based on the clock signal and the UP/DOWN control input. The LOAD control input allows presetting a specific value into the counter, while the ENABLE control input enables or disables the counting operation. The ripple carry output can be used to cascade multiple counters for larger counting ranges.

Detailed Application Field Plans

The CD74HCT191M is commonly used in various applications that require counting functionality. Some of the potential application fields include:

1. Digital frequency dividers
2. Industrial automation systems
3. Electronic test equipment
4. Communication systems
5. Automotive electronics

Detailed and Complete Alternative Models

1. SN74HCT191: Similar to CD74HCT191M, but available in a different package (DIP-16).
2. 74HC191: Non-inverting version of the CD74HCT191M with similar specifications.
3. CD4516: 4-bit synchronous binary up/down counter with parallel load capability.

These alternative models offer similar functionality and can be considered as substitutes for the CD74HCT191M depending on specific requirements.

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