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74HC191PW,112
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74HC191PW,112

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Counter/Divider
  • Characteristics: High-speed operation, low power consumption
  • Package: TSSOP (Thin Shrink Small Outline Package)
  • Essence: 4-bit synchronous binary up/down counter with parallel load
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage Range: 2V to 6V
  • Operating Temperature Range: -40°C to +125°C
  • Maximum Clock Frequency: 50 MHz
  • Number of Counting Bits: 4
  • Counting Modes: Up, Down, or Load
  • Output Type: Standard
  • Logic Family: HC (High-Speed CMOS)

Pin Configuration

The 74HC191PW,112 has a total of 16 pins. The pin configuration is as follows:

  1. CP (Clock Pulse) - Input
  2. MR (Master Reset) - Input
  3. U/D (Up/Down) - Input
  4. PL (Parallel Load) - Input
  5. D0 (Data Bit 0) - Input/Output
  6. D1 (Data Bit 1) - Input/Output
  7. D2 (Data Bit 2) - Input/Output
  8. D3 (Data Bit 3) - Input/Output
  9. Q0 (Output Bit 0) - Output
  10. Q1 (Output Bit 1) - Output
  11. Q2 (Output Bit 2) - Output
  12. Q3 (Output Bit 3) - Output
  13. GND (Ground) - Ground
  14. VCC (Supply Voltage) - Power Supply
  15. RC (Ripple Carry) - Output
  16. CET (Count Enable Parallel) - Input

Functional Features

  • Synchronous operation: The counter operates synchronously with the clock pulse.
  • Up/Down counting: The counter can count up or down based on the U/D input.
  • Parallel load: The counter can be loaded with a parallel value when PL is high.
  • Ripple carry output: The RC output provides a carry signal for cascading multiple counters.

Advantages and Disadvantages

Advantages: - High-speed operation: The 74HC191PW,112 can operate at frequencies up to 50 MHz. - Low power consumption: The IC consumes low power, making it suitable for battery-powered devices.

Disadvantages: - Limited counting bits: The counter has only 4 bits, limiting the maximum count value to 15.

Working Principles

The 74HC191PW,112 is a synchronous binary up/down counter. It counts in either the up or down direction based on the U/D input. The counter increments or decrements its value on each clock pulse. When the PL input is high, the counter loads the parallel value present at the D0-D3 inputs. The RC output provides a carry signal for cascading multiple counters.

Detailed Application Field Plans

The 74HC191PW,112 is commonly used in various applications that require counting or dividing functions. Some of the application fields include:

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

Alternative Models

Here are some alternative models that provide similar functionality:

  1. CD40193BE: 4-bit Binary Up/Down Counter
  2. SN74LS191N: Synchronous 4-Bit Up/Down Binary Counters
  3. MC14516B: Presettable Up/Down Counter

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

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af 74HC191PW,112 i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of 74HC191PW,112 in technical solutions:

  1. Q: What is the 74HC191PW,112? A: The 74HC191PW,112 is a 4-bit synchronous binary up/down counter with parallel load.

  2. Q: What is the operating voltage range for the 74HC191PW,112? A: The operating voltage range is typically between 2V and 6V.

  3. Q: How does the parallel load feature work in the 74HC191PW,112? A: The parallel load allows you to load a specific value into the counter by applying it to the parallel data inputs (P0-P3) when the parallel load input (PL) is high.

  4. Q: Can the 74HC191PW,112 count both up and down? A: Yes, the 74HC191PW,112 can count both up and down based on the state of the up/down input (U/D).

  5. Q: What is the maximum clock frequency for the 74HC191PW,112? A: The maximum clock frequency is typically around 25 MHz.

  6. Q: How do I connect multiple 74HC191PW,112 counters together? A: You can cascade multiple counters by connecting the carry output (TC) of one counter to the clock input (CP) of the next counter.

  7. Q: Can I use the 74HC191PW,112 in applications that require asynchronous counting? A: No, the 74HC191PW,112 is a synchronous counter and requires a clock signal for counting.

  8. Q: What is the purpose of the terminal count output (TC) in the 74HC191PW,112? A: The terminal count output goes high when the counter reaches its maximum value (15 in this case) and can be used to trigger external events.

  9. Q: Can I use the 74HC191PW,112 in low-power applications? A: Yes, the 74HC191PW,112 has a low power consumption and can be used in battery-powered devices.

  10. Q: Are there any specific precautions I should take when using the 74HC191PW,112? A: It is important to ensure that the voltage levels applied to the inputs are within the specified range to prevent damage to the device. Additionally, proper decoupling capacitors should be used to minimize noise and ensure stable operation.

Please note that these answers are general and may vary depending on the specific application and requirements.