SN74LS674N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Shift Register
• Characteristics:
  • High-speed operation
  • TTL compatible inputs and outputs
  • Parallel or serial data entry
  • Cascadable for larger shift registers
• Package: DIP (Dual In-line Package)
• Essence: The SN74LS674N is a 4-bit parallel or serial-in, serial-out shift register with asynchronous reset.
• Packaging/Quantity: Available in tubes of 25 units or reels of 2000 units.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Input Voltage High: 2.0V (min), 0.8V (max)
• Input Voltage Low: 0.8V (min), 0.4V (max)
• Output Voltage High: 2.7V (min), 3.4V (max)
• Output Voltage Low: 0.5V (max)

Detailed Pin Configuration

The SN74LS674N has a total of 16 pins:

1. SER (Serial Data Input)
2. P/S (Parallel/Serial Select)
3. CLK (Clock Input)
4. RST (Reset Input)
5. QA (Output A)
6. QB (Output B)
7. QC (Output C)
8. QD (Output D)
9. GND (Ground)
10. VCC (Supply Voltage)
11. QA' (Complementary Output A)
12. QB' (Complementary Output B)
13. QC' (Complementary Output C)
14. QD' (Complementary Output D)
15. QH (Output High Impedance)
16. QH' (Complementary Output High Impedance)

Functional Features

• Parallel or serial data entry: The SN74LS674N can accept data in parallel or serial format, providing flexibility in data input.
• Cascadable for larger shift registers: Multiple SN74LS674N devices can be cascaded together to create larger shift registers with increased storage capacity.
• Asynchronous reset: The device includes an asynchronous reset input (RST) that allows the register to be cleared at any time, independently of the clock signal.

Advantages and Disadvantages

Advantages: - High-speed operation: The SN74LS674N is designed for high-speed applications, making it suitable for time-critical tasks. - TTL compatible inputs and outputs: The device is compatible with TTL logic levels, allowing easy integration into existing systems. - Flexible data input: The ability to accept data in parallel or serial format provides versatility in different application scenarios.

Disadvantages: - Limited storage capacity: As a 4-bit shift register, the SN74LS674N has a relatively small storage capacity compared to higher-bit counterparts. - Lack of built-in error detection/correction: The device does not include built-in error detection or correction mechanisms, requiring additional circuitry for such functionalities if needed.

Working Principles

The SN74LS674N operates based on the principles of sequential logic. It uses flip-flops to store and shift data bits. The clock signal controls the shifting of data from one flip-flop to another. The P/S input determines whether data is entered in parallel or serial mode. The RST input asynchronously resets the register, clearing all stored data.

Detailed Application Field Plans

The SN74LS674N can be used in various applications, including:

1. Data communication systems
2. Serial-to-parallel conversion
3. Parallel-to-serial conversion
4. Data storage and retrieval systems
5. Shift register-based counters

Detailed and Complete Alternative Models

1. SN74LS595N: 8-bit serial-in, parallel-out shift register
2. SN74HC164N: 8-bit serial-in, parallel-out shift register
3. CD4015BE: Dual 4-bit static shift register
4. CD4021BE: 8-stage static shift register
5. CD4094BE: 8-bit serial-in, parallel-out shift register with output latches

These alternative models offer similar functionality to the SN74LS674N and can be considered as alternatives based on specific requirements.

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