Sequential Circuits and Latch Worksheet

Oscar is designing a security system for a building. He wants the alarm to trigger not just based on the current sensor inputs, but also depending on whether certain sensors were triggered earlier in the day. Fill in the blank: The type of digital circuit Oscar should use is one whose output depends not only on the current inputs but also on the history of inputs—that is, past states of the circuit.

• A sequential circuit is a type of digital circuit whose output depends not only on the current inputs but also on the history of inputs—that is, past states of the circuit.

• A sequential circuit is a type of digital circuit whose output depends only on the current inputs and not on any previous states.

• A sequential circuit is a type of analogue circuit whose output depends only on the voltage levels at the input.

• A sequential circuit is a type of digital circuit whose output is always constant regardless of the inputs.

Max is designing a digital security system for his home. He is considering different types of circuits. Which of the following is NOT a key characteristic of sequential circuits?

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• C) State

• B) Clock

• A) Memory

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Matilda is building a digital lock system. She learns that sequential circuits have ______ elements (such as flip-flops or latches) that store past input states, which is important for her lock to remember previous button presses.

• memory

• resistor

• diode

• capacitor

Daniel is designing a digital alarm clock. He learns that many sequential circuits in such devices are synchronised by a clock signal, which coordinates when the state of the circuit updates.

• True

• False

Benjamin is designing a digital clock that needs to update its display at regular intervals using a timing signal. Which type of sequential circuit should Benjamin use to ensure the clock updates in sync with the timing signal?

• Synchronous Sequential Circuits

• Asynchronous Sequential Circuits

Evie is designing a traffic light system for a busy intersection. She wants the lights to change state immediately whenever a sensor detects a car, without waiting for any regular timing signal. Fill in the blank: Asynchronous Sequential Circuits do not use a ______. State changes occur immediately with input changes—faster but more difficult to design reliably.

• clock

• register

• flip-flop

• counter

Matilda is setting up different electronic devices in her workshop. She wants to identify which of the following devices is NOT an example of a sequential circuit. Which one should she choose?

• Binary counter

• Shift register

• Memory unit

• Resistor

Matilda is building a simple security system for her room. She uses a basic digital circuit that can store one bit of information — either a ___ or a ___. What is this circuit called?

• A latch is a basic digital circuit that can store one bit of information — either a 0 or a 1.

• A latch is a basic digital circuit that can store one bit of information — either a 1 or a 2.

• A latch is a basic digital circuit that can store one bit of information — either a 0 or a 2.

• A latch is a basic digital circuit that can store one bit of information — either a 1 or a 3.

Jacob is designing a digital system and needs a component that can remember its previous state. According to the table, what type of circuit should Jacob use for this purpose?

• Combinational

• Sequential (has memory)

• Analogue

• None of the above

Evie is building a simple memory device for her project. According to the table she is using, how much data does a latch store?

• 1 bit of data

• 2 bits of data

• 8 bits of data

• 16 bits of data