CD74HC297E

Product Overview

• Category: Integrated Circuit
• Use: Data Selector/Multiplexer
• Characteristics: High-Speed, CMOS Logic, 8-Bit Parallel-In/Serial-Out Shift Register
• Package: DIP (Dual In-line Package)
• Essence: The CD74HC297E is a versatile integrated circuit that functions as an 8-bit parallel-in/serial-out shift register. It is commonly used in digital systems for data selection and multiplexing purposes.
• Packaging/Quantity: The CD74HC297E is typically sold in packs of 25 units.

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: HC
• Number of Bits: 8
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 15 ns (typical)
• Output Current: ±5.2 mA

Pin Configuration

The CD74HC297E has a total of 16 pins, which are assigned specific functions:

1. GND (Ground)
2. A0 (Parallel Data Input Bit 0)
3. A1 (Parallel Data Input Bit 1)
4. A2 (Parallel Data Input Bit 2)
5. A3 (Parallel Data Input Bit 3)
6. A4 (Parallel Data Input Bit 4)
7. A5 (Parallel Data Input Bit 5)
8. A6 (Parallel Data Input Bit 6)
9. A7 (Parallel Data Input Bit 7)
10. CLK (Clock Input)
11. SER (Serial Data Input)
12. QH (Serial Data Output)
13. MR (Master Reset)
14. OE (Output Enable)
15. VCC (Positive Supply Voltage)
16. GND (Ground)

Functional Features

• The CD74HC297E can be used as an 8-bit parallel-in/serial-out shift register.
• It has a clock input (CLK) that controls the shifting of data.
• The master reset (MR) pin allows for resetting the shift register to its initial state.
• The output enable (OE) pin enables or disables the output stage.
• It operates at high-speed and is compatible with CMOS logic.

Advantages and Disadvantages

Advantages: - High-speed operation - Versatile data selection and multiplexing capabilities - Wide operating voltage range - Compact DIP package for easy integration into circuit boards

Disadvantages: - Limited number of bits (8) - Requires external clock signal for proper operation - Not suitable for applications requiring larger data storage capacities

Working Principles

The CD74HC297E operates based on the principle of serial data shifting. When clock pulses are applied to the CLK input, the parallel data inputs (A0-A7) are sequentially shifted into the shift register. The data can then be read out serially from the QH output pin. The master reset (MR) pin resets the shift register to its initial state, and the output enable (OE) pin controls the output stage.

Application Field Plans

The CD74HC297E finds applications in various digital systems where data selection and multiplexing are required. Some potential application fields include:

1. Communication Systems: Used for data routing and switching in telecommunication networks.
2. Industrial Automation: Enables efficient control and monitoring of multiple devices through data selection.
3. Automotive Electronics: Facilitates data transmission and processing in automotive control units.
4. Consumer Electronics: Integrated into audio/video equipment for channel selection and signal routing.
5. Computer Systems: Utilized in memory addressing and data manipulation operations.

Alternative Models

1. SN74HC297N: Similar functionality and specifications, but in a different package (DIP-16).
2. CD4015BE: 8-bit parallel-in/serial-out shift register with additional features like asynchronous reset.
3. CD4021BE: 8-bit parallel-in/serial-out shift register with parallel output capability.

These alternative models can be considered based on specific requirements and compatibility with the existing system.

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