74574 (Octal D-type Flip-Flop with 3-state outputs)

The 74574 is an Octal D-type Flip-Flop with 3-state outputs. It is part of the 7400 series of ICs and is typically used for storing and manipulating 8-bit binary data. This IC is widely used in digital circuits where you need to store data, and it has the ability to control the data flow through the use of its tri-state outputs.

74574 IC Description:

The 74574 is an 8-bit D-type flip-flop with 3-state outputs and is designed to store 8-bit data. It has a clock input and a clear input, and the flip-flops are triggered on the rising edge of the clock. The outputs are tri-state (high-impedance), meaning they can either output a logic high (1), a logic low (0), or be in a high-impedance state (which effectively disconnects the output from the circuit).

Key Features:

• 8 D-type Flip-Flops: It has 8 individual D-type flip-flops, allowing it to store 8 bits of data.
• 3-State Outputs: The outputs are tri-state, meaning they can be in one of three states: logic high (1), logic low (0), or high-impedance (which disconnects the output).
• Clocked Operation: The flip-flops are edge-triggered, meaning they update their state on the rising edge of the clock.
• Clear Function: It has an active-low clear pin that resets all the flip-flops to 0 when triggered.
• Enable Pin: The IC has an enable (OE) pin that controls whether the outputs are active or in a high-impedance state.
• TTL Compatible: The IC is compatible with TTL (Transistor-Transistor Logic) logic levels.

Pin Configuration (16-pin package):

Here’s the pinout for the 74574 Octal D-type flip-flop with 3-state outputs:

1. Pin 1 (Q1): Output of flip-flop 1.
2. Pin 2 (Q2): Output of flip-flop 2.
3. Pin 3 (Q3): Output of flip-flop 3.
4. Pin 4 (Q4): Output of flip-flop 4.
5. Pin 5 (Q5): Output of flip-flop 5.
6. Pin 6 (Q6): Output of flip-flop 6.
7. Pin 7 (Q7): Output of flip-flop 7.
8. Pin 8 (Q8): Output of flip-flop 8.
9. Pin 9 (Clear): Active-low clear input (resets all flip-flops to 0).
10. Pin 10 (Clock): Clock input (triggers flip-flops on the rising edge).
11. Pin 11 (D1): Data input for flip-flop 1.
12. Pin 12 (D2): Data input for flip-flop 2.
13. Pin 13 (D3): Data input for flip-flop 3.
14. Pin 14 (D4): Data input for flip-flop 4.
15. Pin 15 (Enable): Output enable (OE) pin, controls whether outputs are active or high-impedance.
16. Pin 16 (Vcc): Supply voltage (typically 5V).