Flip-Flops and their Types Quiz

Types of Flip-Flops

• SR ("set-reset"), D ("data" or "delay"), T ("toggle"), and JK types are common types of flip-flops.

D Flip-Flop

• Captures the value of the D-input at a definite portion of the clock cycle (such as the rising edge of the clock).
• The captured value becomes the Q output.
• At other times, the output Q does not change.
• Can be viewed as a memory cell.

Latches and Buffers

• Latches (e.g. 74LS374) latch and hold data for input to the controller and output to external devices.
• Latches protect the controller from short circuits that might occur in external devices.
• Buffers (e.g. 74LS244, 74LS245) are used in interfacing circuitry to input and output data from CPU and external devices.

Tri-State Buffers

• Allow control over when an output signal makes it to the bus.
• When the control bit is active, the input of the device makes it to the output.
• When the control bit is inactive, the output of the device is high-impedance or nothing.

Input and Output Interfacing

• Output interfacing: used to output data from the data bus to external devices connected to the controlling system.
• Input interfacing: sources of binary information (0, 1) are usually the output of logic gates or other circuits such as switches.

Flip-Flops and Digital Electronics

• Flip-flops are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems.
• Flip-flops and latches are used as data storage elements, storing a single bit (binary digit) of data.

Inverters and Buffers

• An inverter is a NOT gate, represented by a triangle followed by a circle/bubble (negation).
• A buffer is a device whose output will always follow its input.