M74HC191B1R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Counter/Divider
• Characteristics: High-speed, synchronous, up/down counter with parallel load
• Package: 16-pin DIP (Dual In-line Package)
• Essence: The M74HC191B1R is a versatile counter/divider IC that can be used in various applications requiring counting or dividing functionalities.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 2V to 6V
• Operating Temperature Range: -40°C to +125°C
• Maximum Clock Frequency: 25 MHz
• Number of Counting Bits: 4
• Counting Modes: Up, Down, and Parallel Load
• Output Type: Synchronous
• Propagation Delay: 14 ns (typical)

Pin Configuration

The M74HC191B1R has a total of 16 pins. Here is the detailed pin configuration:

1. CP (Clock Pulse) - Input
2. MR (Master Reset) - Input
3. P0 (Parallel Data Input Bit 0) - Input
4. P1 (Parallel Data Input Bit 1) - Input
5. P2 (Parallel Data Input Bit 2) - Input
6. P3 (Parallel Data Input Bit 3) - Input
7. TC (Terminal Count) - Output
8. Q0 (Least Significant Bit) - Output
9. Q1 - Output
10. Q2 - Output
11. Q3 (Most Significant Bit) - Output
12. GND (Ground) - Ground
13. QD (Quiescent State) - Output
14. UD (Up/Down Control) - Input
15. PL (Parallel Load) - Input
16. VCC (Supply Voltage) - Power Supply

Functional Features

• High-speed operation allows for efficient counting and dividing tasks.
• Synchronous design ensures accurate and reliable results.
• Up, down, and parallel load counting modes provide flexibility in various applications.
• Terminal Count (TC) output signal indicates when the counter reaches its maximum value.
• Quiescent State (QD) output provides a low-level signal when the counter is not actively counting.

Advantages and Disadvantages

Advantages: - High-speed operation enables quick counting and dividing tasks. - Versatile counting modes offer flexibility in different applications. - Synchronous design ensures accurate results. - Compact 16-pin DIP package allows for easy integration into circuits.

Disadvantages: - Limited number of counting bits (4 bits) may restrict the range of applications. - Requires an external clock pulse for operation.

Working Principles

The M74HC191B1R operates based on synchronous counting principles. It counts up or down based on the input signals provided to the UD (Up/Down Control) pin. The CP (Clock Pulse) input triggers the counting action, and the MR (Master Reset) input resets the counter to its initial state.

In parallel load mode, the counter can be loaded with a specific value by providing the desired binary data through the P0-P3 (Parallel Data Input) pins and activating the PL (Parallel Load) input.

The TC (Terminal Count) output signal indicates when the counter reaches its maximum value, allowing for further actions or triggering other components in the circuit.

Detailed Application Field Plans

The M74HC191B1R can be used in various applications that require counting or dividing functionalities. Some potential application fields include:

1. Frequency Dividers: The IC can divide an input frequency by a specific factor, allowing for frequency reduction or synchronization in digital systems.
2. Event Counters: It can be used to count events or pulses generated by external sensors or devices, enabling applications such as traffic monitoring or industrial automation.
3. Timekeeping Circuits: The IC can be utilized in timekeeping circuits where precise counting of seconds, minutes, or hours is required.
4. Digital Displays: It can drive digital displays by providing the necessary counting and control signals.

Detailed and Complete Alternative Models

1. CD40193B: 4-bit synchronous up/down counter with parallel load
2. SN74HC191: Synchronous up/down binary counter with asynchronous clear
3. MC14553B: Programmable timer/counter with internal oscillator

These alternative models offer similar functionalities to the M74HC191B1R and can be considered based on specific requirements and availability.

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