CD74HC191MT

Product Overview

• Category: Integrated Circuit
• Use: Counter/Divider
• Characteristics: High-Speed, CMOS Logic, Synchronous Operation
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The CD74HC191MT 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 CD74HC191MT 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
• Output Current: ±5mA
• Propagation Delay: 13 ns (typical)

Pin Configuration

The CD74HC191MT has a total of 16 pins. Here is the detailed pin configuration:

1. MR (Master Reset)
2. CP (Clock Pulse)
3. UP/DN (Up/Down Control)
4. PE (Parallel Enable)
5. QA (Output A)
6. QB (Output B)
7. QC (Output C)
8. QD (Output D)
9. GND (Ground)
10. VCC (Power Supply)
11. RC (Ripple Carry Output)
12. TC (Terminal Count Output)
13. PL (Parallel Load)
14. P0 (Parallel Data Input 0)
15. P1 (Parallel Data Input 1)
16. P2 (Parallel Data Input 2)

Functional Features

• Synchronous Operation: The CD74HC191MT operates synchronously, ensuring accurate counting or dividing of signals based on the clock pulse.
• Up/Down Control: The UP/DN pin allows the user to select whether the counter should count up or down.
• Parallel Load: The PL pin enables the parallel loading of data into the counter, allowing for preset values.
• Terminal Count Output: The TC pin indicates when the counter reaches its maximum value, providing a signal for further control.
• Ripple Carry Output: The RC pin provides a carry-out signal when the counter overflows.

Advantages and Disadvantages

Advantages: - High-speed operation - Wide supply voltage range - Synchronous counting/dividing - Parallel loading capability

Disadvantages: - Limited number of stages (4) - Propagation delay may affect timing-sensitive applications

Working Principles

The CD74HC191MT is based on CMOS logic technology. It operates by counting or dividing input signals based on the clock pulse. The counter can be set to count up or down using the UP/DN pin. The parallel load feature allows presetting of values, and the terminal count output indicates when the counter reaches its maximum value. The ripple carry output provides a carry-out signal when the counter overflows.

Application Field Plans

The CD74HC191MT can be used in various applications that require counting or dividing signals. Some potential application fields include:

1. Frequency Dividers: The CD74HC191MT can be used to divide an input frequency by a specific factor, generating lower-frequency output signals.
2. Event Counters: It can be employed as an event counter in systems that need to keep track of occurrences or events.
3. Digital Timers: The CD74HC191MT can be utilized in digital timer circuits to measure time intervals accurately.
4. Industrial Automation: It can be integrated into industrial automation systems for counting and controlling processes.

Alternative Models

Here are some alternative models that provide similar functionality to the CD74HC191MT:

1. SN74HC191: This is a similar CMOS counter/divider IC from Texas Instruments.
2. CD40193: A CMOS presettable up/down counter IC from Texas Instruments.
3. 74LS191: A TTL (Transistor-Transistor Logic) counter/divider IC from various manufacturers.

These alternative models can be considered based on specific requirements and availability.

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