CD74HC191MG4

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-Speed, CMOS Logic, Synchronous Operation
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The CD74HC191MG4 is a high-speed CMOS logic counter/divider integrated circuit. It operates synchronously and can be used in various applications that require counting or dividing signals.
• Packaging/Quantity: The CD74HC191MG4 is typically sold 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 Stages: 4
• Counting Modes: Up, Down, Up/Down, Asynchronous Load
• Output Type: Standard (Non-Inverted)

Pin Configuration

The CD74HC191MG4 has a total of 16 pins, which are assigned specific functions as follows:

1. CLK (Clock Input)
2. MR (Master Reset Input)
3. U/D (Up/Down Control Input)
4. PL (Parallel Load Input)
5. QA (Output A)
6. QB (Output B)
7. QC (Output C)
8. QD (Output D)
9. GND (Ground)
10. VCC (Positive Power Supply)
11. RC (Ripple Carry Output)
12. CET (Count Enable Parallel Input)
13. PE (Preset Enable Input)
14. TE (Terminal Count Enable Input)
15. TC (Terminal Count Output)
16. OE (Output Enable Input)

Functional Features

• Synchronous Operation: The CD74HC191MG4 operates synchronously with the clock input, ensuring accurate counting or dividing of signals.
• Multiple Counting Modes: It supports various counting modes, including up, down, up/down, and asynchronous load, providing flexibility in different applications.
• Parallel Load Capability: The parallel load input allows the user to preset the initial count value by loading it directly into the counter.
• Terminal Count Output: The terminal count output (TC) indicates when the counter reaches its maximum count value, enabling easy detection of completion.
• Ripple Carry Output: The ripple carry output (RC) can be used to cascade multiple CD74HC191MG4 counters for higher counting ranges.

Advantages and Disadvantages

Advantages: - High-speed operation - Wide supply voltage range - Versatile counting modes - Compact SOIC package - Easy integration with other logic circuits

Disadvantages: - Limited number of stages (4) - Non-inverted output type only

Working Principles

The CD74HC191MG4 is based on CMOS technology, which provides high-speed operation and low power consumption. It utilizes synchronous logic, where the clock input controls the counting or dividing process. The counter can operate in different modes depending on the control inputs, allowing for flexible functionality.

When the clock input receives a rising edge, the counter increments or decrements its current count value based on the up/down control input. The parallel load input enables the user to preset the counter's initial value by loading it directly. The terminal count output indicates when the counter reaches its maximum count value, while the ripple carry output allows for cascading multiple counters.

Detailed Application Field Plans

The CD74HC191MG4 can be applied in various fields that require signal counting or dividing. Some potential application areas include:

1. Frequency Dividers: The CD74HC191MG4 can be used to divide an input frequency by a specific factor, allowing for frequency reduction or synchronization in communication systems.
2. Event Counters: It can be employed to count events or pulses generated by sensors, switches, or other devices, enabling accurate monitoring and control in industrial automation.
3. Time Delay Generators: By utilizing the CD74HC191MG4's counting capabilities, time delay circuits can be constructed for applications such as timing sequences or signal synchronization.
4. Digital Clocks: The counter can be utilized in digital clock circuits to keep track of time and display it accurately.

Detailed and Complete Alternative Models

1. CD74HC192E: Similar to the CD74HC191MG4, this model also offers 4-bit synchronous up/down counters but with different package options.
2. CD4029BE: This model is a 4-bit presettable up/down counter that operates asynchronously, providing an alternative for specific applications.
3. SN74LS193N: A 4-bit synchronous binary up/down counter with parallel load capability, suitable for various counting applications.

These alternative models offer similar functionality to the CD74HC191MG4 and can be considered based on specific requirements and availability.