CD4027BE

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Logic - Flip Flops

The CD4027BE is a very common type of flip-flop which incorporates two data inputs, J and K, two clock inputs, CP and CP/, two master reset inputs, MR and MR/, and two outputs, Q and Q*. It is typically used as a toggle flip flop with both J and K, and CP and CP/ connected together such that a single input change drives the output, as shown in Figure 1.

The CD4027BE is classified as a Synchronous Master-Slave flip-flop. A synchronous flip-flop is one that only changes state when the clock signal (CP in the case of the CD4027BE) transitions from low to high. This is called the active edge. The master-slave part of the name is derived from two separate flip-flops inside the device. The master flip-flop is clocked by CP and captures the data on J and K at the active edge. The slave flip-flop is clocked by the inverse of the clock signal (CP/), and copies the output of the master at the inactive edge, thereby capturing the state at the active edge. This design allows the device to “remember” the state indefinitely without retaining power to the device.

The input data signals determine the output of the CD4027BE based on the logic chart in Figure 2. The chart shows that when J is high and K is low, the output Q* is low and Q is high. Conversely, when J is low and K is high, the output Q* is high and Q is low. When both J and K are high or low, the output neither changes from the previous state, or switches to the opposite state. The difference between the J and K inputs is that when J is high and K is low, the state of the output is determined at the active edge of the clock. When K is high and J is low, the output is determined at the inactive edge.

The flip-flop can be used to “latch” or store data and detect variations in signals. When the input conditions change, the output of the flip-flop will change, which is then detected by a logic circuit. This can be used in clocked systems such as frequency counters and binary counters to detect changes in the frequency of a signal or detect transitions in a binary number.

The CD4027BE has two other input signals, MR and MR/. MR is the master reset signal that sets the output of the flip-flop to zero (Q* = 1, Q = 0) regardless of the conditions of the other inputs when it transitions from low to high. It should be noted that this signal is asynchronous, meaning that it operates at any clock state. The master reset signal is usually used in systems where the outputs of the flip-flop must be initialized before the system is used. MR/ is the reset inverse, or reset bar signal. This signal is inverted from the normal reset signal, such as in the case of when the master reset signal is tied to a logic high, but the reset bar signal is tied to logic low. This will cause the flip-flop to reset the output to one (Q* = 0, Q = 1).

In summary, the CD4027BE is a very useful type of flip-flop which can be used in many applications that require reliable and predictable latching or storage of data. It is often used in clocked systems such as frequency counters and binary counters, and is also useful in applications where it is necessary to reset the output regardless of the state of the clock.

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