Draw a labelles circuit diagram of an SR latch using two NAND gates

Sure, here's a labeled circuit diagram of an SR latch using two NAND gates:

S ───┬─────────────────────► Q
     │
     ├─┬────────┬──┐
     │ │        │  |
     │ │NAND    │  |
     │ │        │  ├─► Q'
     │ │        │  |
     │ └────────┘  |
     │             |
     └───┬─────────┘
         │
         │
R ──────┘

In this diagram, S and R are the "set" and "reset" inputs, respectively. Q and Q' are the two outputs, representing the "set" and "reset" states of the latch. The NAND gates are used to create a feedback loop that maintains the current state of the latch until a new input is received.

相关问题

Study, construct and verify the operation of an SR latch (built using two NAND gates – see Figure 4), and then describe in your own words how an SR latch works . Your answer must also include a labelled schematic diagram of your SR latch. Note: Please make sure you indicate how different pins are connected.

Sure, I can help you with that. Here is a labelled schematic diagram of an SR latch built using two NAND gates:

    +-----+               +-----+
----|NAND1|---------------|     |
    +--+--+               |     |
       |SR|---------------|NAND2|
    +--+--+               |     |
----|NAND3|---------------|     |
    +-----+               +-----+

In this diagram, the inputs S (set) and R (reset) are connected to the two NAND gates. The output of NAND1 is connected to the input of NAND2, and the output of NAND2 is connected to the input of NAND3. The outputs of NAND1 and NAND3 are the complementary outputs Q and Q̅, respectively.

To understand how an SR latch works, let's consider the following scenarios:

1. When S=0 and R=0: Both inputs of NAND1 and NAND3 are high, which means their outputs are low. This makes the input of NAND2 high, which in turn makes its output low. This maintains the previous state of the latch, and both Q and Q̅ remain unchanged.

2. When S=1 and R=0: The high input of NAND1 makes its output low, which sets the input of NAND2 to low. The low input of NAND3 makes its output high, which in turn makes the input of NAND2 high. This causes the output of NAND2 to toggle, with Q becoming high and Q̅ becoming low.

3. When S=0 and R=1: The high input of NAND3 makes its output low, which resets the input of NAND2 to high. The low input of NAND1 makes its output high, which in turn makes the input of NAND2 low. This causes the output of NAND2 to toggle, with Q becoming low and Q̅ becoming high.

4. When S=1 and R=1: Both inputs of NAND1 and NAND3 are low, which means their outputs are high. This makes the input of NAND2 low, which in turn makes its output high. This causes the outputs of NAND1 and NAND3 to toggle, with Q and Q̅ both becoming low.

In summary, an SR latch built using two NAND gates can latch and store a single bit of information. The latch operates in two stable states, depending on the values of the S and R inputs. When S=0 and R=0, the latch maintains its previous state. When S=1 and R=0, the latch sets its output to high. When S=0 and R=1, the latch resets its output to low. And when S=1 and R=1, the latch enters an undefined state where both outputs are low.

Study, construct and verify the operation of a clocked SR latch (built using four NAND gates), and then describe in your own words how a clocked SR latch works. Your answer must also include a labelled schematic diagram of your clocked SR latch. Note: Please make sure you indicate how different pins are connected.

Sure, I understand your question. Here is a labelled schematic diagram of a clocked SR latch built using four NAND gates:

        +------+    +------+
Clk --- |      |    |      |
        |  N1  |----|  N2  |--- Q
S   --- |      |    |      |
        +------+    +------+
          |            |
          |    +------+|
          +----|      ||
               |  N3  ||
          +----|      ||--- /Q
          |    +------+|
          |            |
          |    +------+|
          +----|      ||
               |  N4  ||
               |      ||
               +------+

In this diagram, N1 and N2 are cross-coupled NAND gates, which form the latch part of the circuit. N3 and N4 are NAND gates which act as enable gates and are controlled by the clock signal Clk.

To understand how this circuit works, let's first consider the basic SR latch without a clock. When S (set) is high and R (reset) is low, the output Q is set to high and /Q (not Q) is set to low. When S is low and R is high, Q is set to low and /Q is set to high. When both inputs are low, the previous state of the latch is maintained. However, when both inputs are high, the outputs are not well-defined and can oscillate or "race" between the two states.

The clocked SR latch adds a clock signal to control the enable gates N3 and N4. When the clock signal is high, the enable gates are open and the SR latch operates normally, as described above. However, when the clock signal is low, the enable gates are closed and the outputs are "latched" in their current state, ignoring any changes in the inputs. This is because the cross-coupled NAND gates N1 and N2 hold the outputs in their current state, while the enable gates block any changes from the inputs.

In summary, a clocked SR latch is a circuit that combines a basic SR latch with enable gates controlled by a clock signal. When the clock is high, the SR latch operates normally, but when the clock is low, the outputs are "latched" in their current state. This circuit is commonly used in digital systems to synchronize signals and avoid "race" conditions.