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74HC191DB,112
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74HC191DB,112

Product Overview

  • Category: Integrated Circuit
  • Use: Counter/Divider
  • Characteristics: High-speed operation, low power consumption
  • Package: SOIC (Small Outline Integrated Circuit)
  • 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
  • Input Capacitance: 3.5pF
  • Output Current: ±6mA
  • Clock Frequency: 50MHz

Pin Configuration

The 74HC191DB,112 has a total of 16 pins. The pin configuration is as follows:

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

Functional Features

  • Synchronous counting in both up and down directions
  • Parallel loading of initial count value
  • Asynchronous master reset
  • Terminal count output for cascading multiple counters
  • Ripple carry output for cascading counters without terminal count

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient counting applications - Low power consumption minimizes energy usage - Parallel load feature enables easy initialization of the counter

Disadvantages: - Limited to 4-bit counting, may not be suitable for applications requiring larger count ranges - Requires external components for cascading multiple counters

Working Principles

The 74HC191DB,112 is a synchronous binary up/down counter. It counts in both directions based on the control input (UP/DN). The counter can be loaded with an initial value using the parallel load (PL) input. The clock pulse (CP) input triggers the counting operation.

The master reset (MR) input asynchronously resets the counter to its initial state. The terminal count (TC) output indicates when the counter reaches its maximum or minimum count value. The ripple carry (RC) output allows for cascading multiple counters without relying on the terminal count.

Detailed Application Field Plans

The 74HC191DB,112 is commonly used in various applications, including:

  1. Frequency division: The counter can be used to divide an input frequency by a specific factor.
  2. Event sequencing: It can be employed to sequence events in a predetermined order.
  3. Digital displays: The counter can drive digital displays to show numerical values.
  4. Industrial automation: It finds application in controlling and monitoring processes in industrial automation systems.

Alternative Models

Other alternative models that offer similar functionality to the 74HC191DB,112 include:

  1. CD40193: 4-bit synchronous up/down counter with parallel load
  2. SN74LS191: Synchronous 4-bit up/down counter with parallel load
  3. MC14519B: Binary up/down counter with parallel load

These alternatives provide options for different package types, voltage ranges, and additional features.

In conclusion, the 74HC191DB,112 is a versatile integrated circuit that serves as a 4-bit synchronous binary up/down counter with parallel load. Its high-speed operation, low power consumption, and various applications make it a valuable component in digital systems.

10個與74HC191DB,112在技術方案中應用相關的常見問題與解答

Sure! Here are 10 common questions and answers related to the application of 74HC191DB,112 in technical solutions:

  1. Q: What is the function of the 74HC191DB,112? A: The 74HC191DB,112 is a synchronous up/down counter with a parallel load capability.

  2. Q: What is the maximum clock frequency supported by the 74HC191DB,112? A: The 74HC191DB,112 can operate at a maximum clock frequency of 25 MHz.

  3. Q: How many bits does the 74HC191DB,112 have? A: The 74HC191DB,112 is a 4-bit counter, meaning it can count from 0 to 15.

  4. Q: Can the 74HC191DB,112 be used as a binary-to-decimal decoder? A: No, the 74HC191DB,112 is primarily designed as a counter and doesn't have built-in decoding functionality.

  5. Q: What is the purpose of the parallel load input (PL) in the 74HC191DB,112? A: The parallel load input allows you to load a specific value into the counter by applying the desired binary value to the parallel inputs (P0-P3) and then pulsing the PL input.

  6. Q: Does the 74HC191DB,112 support both up-counting and down-counting? A: Yes, the 74HC191DB,112 supports both up-counting and down-counting based on the state of the up/down control input (U/D).

  7. Q: Can I cascade multiple 74HC191DB,112 counters to increase the number of bits? A: Yes, you can cascade multiple 74HC191DB,112 counters to increase the number of bits and achieve larger counting ranges.

  8. Q: What is the purpose of the carry output (CO) in the 74HC191DB,112? A: The carry output indicates when the counter has reached its maximum value (15 in this case) and can be used to cascade additional counters or trigger other logic.

  9. Q: Can I connect an external clock signal to the 74HC191DB,112? A: Yes, the 74HC191DB,112 has a clock input (CP) that allows you to connect an external clock signal for counting.

  10. Q: Is the 74HC191DB,112 compatible with both TTL and CMOS logic levels? A: Yes, the 74HC191DB,112 is designed to be compatible with both TTL and CMOS logic levels, making it versatile for various applications.

Please note that the specific part number mentioned (74HC191DB,112) may vary depending on the manufacturer or distributor.