CD74HC191EG4

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-Speed, CMOS Logic, Synchronous Operation
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: The CD74HC191EG4 is a high-speed CMOS logic counter/divider IC that operates synchronously. It is commonly used in digital circuits for counting and dividing signals.
• 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: 50 MHz
• Number of Stages: 4-bit binary counter with synchronous reset
• Output Drive Capability: 5.2 mA at 4.5V
• Propagation Delay: 13 ns (typical)

Pin Configuration

The CD74HC191EG4 has a 16-pin SOIC package with the following 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. RC (Ripple Carry Output)
14. ENT (Enable Counting Input)
15. VCC (Supply Voltage)
16. TC (Terminal Count Output)

Functional Features

• Synchronous operation allows precise control over counting and dividing signals.
• The master reset input (MR) resets the counter to its initial state.
• The count enable parallel input (CPD) enables or disables counting based on the input value.
• Parallel data inputs (P0-P3) allow presetting the initial count value.
• Outputs (Q0-Q3) provide the binary representation of the current count value.
• The ripple carry output (RC) indicates when the counter reaches its maximum count value.
• The enable counting input (ENT) controls whether the counter counts up or down.
• The terminal count output (TC) signals when the counter reaches its maximum or minimum count value.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting and dividing of signals. - CMOS logic ensures low power consumption and compatibility with a wide range of digital circuits. - Synchronous operation provides precise control over counting operations. - Compact 16-pin SOIC package offers ease of integration into circuit designs.

Disadvantages: - Limited number of stages (4-bit) may not be sufficient for complex counting applications. - Requires external components for clock generation and signal conditioning in certain applications.

Working Principles

The CD74HC191EG4 is a synchronous counter/divider that operates based on the clock input (CLK). When enabled, it counts up or down based on the enable counting input (ENT). The counter can be reset to its initial state using the master reset input (MR). The count enable parallel input (CPD) determines whether the counter counts or holds its current value based on the input level. The parallel data inputs (P0-P3) allow presetting the initial count value. The outputs (Q0-Q3) provide the binary representation of the current count value. The ripple carry output (RC) indicates when the counter reaches its maximum count value. The terminal count output (TC) signals when the counter reaches its maximum or minimum count value.

Detailed Application Field Plans

The CD74HC191EG4 is widely used in various digital applications, including:

1. Frequency Division: The counter can be used to divide an input frequency by a specific factor, allowing for frequency scaling in electronic systems.
2. Time Delay Generation: By counting clock cycles, the IC can generate precise time delays for controlling events in digital circuits.
3. Event Sequencing: The counter can be utilized to sequence events or control the order of operations in complex digital systems.
4. Address Decoding: In memory and peripheral interfacing, the IC can be employed for address decoding purposes.
5. Digital Control Systems: The counter can be integrated into digital control systems to keep track of events or implement specific control algorithms.

Alternative Models

• CD74HC192E
• CD74HCT191E
• SN74HC191N
• MC74HC191N
• 74HC191D

These alternative models offer similar functionality and can be considered as replacements for the CD74HC191EG4 depending on specific requirements and availability.

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