74265 (Octal D-type Flip-Flop with 3-state outputs)

The 74265 is an Octal D-type Flip-Flop with 3-state outputs. It is similar to the 74574, but with the added feature of no reset (clear) functionality and a slightly different configuration. It is part of the 7400 series of logic ICs and is commonly used in digital systems for data storage, shifting, and output control.

74265 IC Description:

The 74265 is an Octal D-type flip-flop with 3-state outputs. The flip-flops are edge-triggered and update their state on the rising edge of the clock input. The 3-state outputs make it ideal for driving shared data buses, as it allows individual devices to either output data or be placed into a high-impedance state, effectively disconnecting from the bus.

Key Features:

• 8 D-type Flip-Flops: The IC contains 8 individual D-type flip-flops, allowing for 8 bits of data storage.
• 3-State Outputs: The outputs are tri-state, meaning they can be in one of three states: high (1), low (0), or high-impedance (Z), making it ideal for bus-based systems.
• Clocked Operation: The flip-flops are edge-triggered and capture data on the rising edge of the clock signal.
• No Clear Pin: Unlike some other flip-flops, the 74265 does not include an active-low clear pin, which simplifies the design in certain systems.
• Enable Pin: The Output Enable (OE) pin controls whether the flip-flops' outputs are actively driven or placed in a high-impedance state.

Pin Configuration (16-pin package):

Here’s the pinout for the 74265 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 (OE - Output Enable): Active-low pin to enable or disable the outputs.
10. Pin 10 (Clock): Clock input for all flip-flops, triggered 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 (D5): Data input for flip-flop 5.
16. Pin 16 (Vcc): Supply voltage (typically 5V).