Encyclopedia Entry: 74FCT543ATQG

Product Overview

Category

The 74FCT543ATQG belongs to the category of integrated circuits (ICs) and specifically falls under the group of octal transparent latches with 3-state outputs.

Use

This product is commonly used in digital systems for data storage and transfer. It serves as a latch, allowing the temporary storage of data before it is transferred to other components or processed further.

Characteristics

• Octal transparent latch: The 74FCT543ATQG consists of eight individual transparent latches, each capable of storing one bit of data.
• 3-state outputs: The outputs of this IC can be put into a high-impedance state, allowing multiple devices to share a common bus without interfering with each other.
• High-speed operation: The 74FCT543ATQG is designed for fast data transfer, making it suitable for applications that require quick response times.

Package and Quantity

This IC is available in a standard 20-pin TSSOP (Thin Shrink Small Outline Package) package. It is typically sold in reels containing a quantity of 250 units.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to Vcc
• Output Voltage Range: 0V to Vcc
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 100MHz

Pin Configuration

The 74FCT543ATQG has a total of 20 pins, which are assigned specific functions as follows:

1. GND: Ground
2. D0: Data input/output 0
3. D1: Data input/output 1
4. D2: Data input/output 2
5. D3: Data input/output 3
6. D4: Data input/output 4
7. D5: Data input/output 5
8. D6: Data input/output 6
9. D7: Data input/output 7
10. OE: Output Enable
11. LE: Latch Enable
12. CLK: Clock Input
13. GND: Ground
14. Q0: Output 0
15. Q1: Output 1
16. Q2: Output 2
17. Q3: Output 3
18. Q4: Output 4
19. Q5: Output 5
20. Q6: Output 6

Functional Features

• Transparent latch operation: The 74FCT543ATQG allows data to pass through when the latch enable (LE) input is high, providing a transparent path for data transfer.
• 3-state outputs: The output enable (OE) input controls the state of the outputs. When OE is low, the outputs are active and reflect the stored data. When OE is high, the outputs enter a high-impedance state.
• Edge-triggered clocking: The IC utilizes a clock input (CLK) to latch the data into its internal storage elements. The data is captured on the rising edge of the clock signal.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data transfer in time-critical applications.
• 3-state outputs allow for bus sharing and reduce the need for additional components.
• Octal configuration provides flexibility in handling multiple data inputs/outputs.

Disadvantages

• Limited voltage range may restrict compatibility with certain systems.
• TSSOP package may require careful handling during assembly due to its small size.

Working Principles

The 74FCT543ATQG operates based on the principle of transparent latching. When the latch enable (LE) input is high, the data inputs (D0-D7) are directly connected to the outputs (Q0-Q6). This allows the data to pass through the IC without any delay.

The clock input (CLK) triggers the latching action. On the rising edge of the clock signal, the data present at the inputs is captured and stored in the internal storage elements. The stored data remains unchanged until the next rising edge of the clock.

The output enable (OE) input controls the state of the outputs. When OE is low, the stored data is available at the outputs. Conversely, when OE is high, the outputs enter a high-impedance state, effectively disconnecting them from the external circuitry.

Application Field Plans

The 74FCT543ATQG finds applications in various digital systems where data storage and transfer are essential. Some potential application fields include:

1. Microprocessors: Used for temporary storage of data during processing.
2. Communication Systems: Facilitates data transfer between different components.
3. Memory Modules: Enables efficient data handling within memory units.