CD74HC109E

Max Propagation Delay @ V, Max CL:	31ns @ 6V, 50pF
Base Part Number:	74HC109
Package / Case:	16-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 125°C (TA)
Input Capacitance:	10pF
Current - Quiescent (Iq):	4µA
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	5.2mA, 5.2mA
Trigger Type:	Positive Edge
Series:	74HC
Clock Frequency:	60MHz
Number of Bits per Element:	1
Number of Elements:	2
Output Type:	Differential
Type:	JK Type
Function:	Set(Preset) and Reset
Part Status:	Active
Packaging:	Tube

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Introduction
CD74HC109E, also called D-type flip flop, is an integrated circuit that belongs to the logic flip flops category. Flip flops are generally used to store an amount of two binary-state information, we can often called it either 0 or 1. It is a useful chip in the field of digital circuitry, which can be used to represent dual state logic. CD74HC109E has two stable states, one for each input terminal, and each of them can switch to the other.
Application field
CD74HC109E is used in a wide range of applications, including digital circuits, such as:

• Processor or controller circuits: CD74HC109E can be used as memory device in these type of digital circuits, as it can store values.
• Sequencers: CD74HC109E is a very useful chip in sequencer circuits, as it is able to store specific values and can be used to represent the state of the circuit.
• Counter circuits: It can be used to store a certain number of values and can be used to count the frequency of the input.
• Comparator circuits: CD74HC109E can be used as a comparator, which is useful in circuits to compare two values.
• Multiplexer: CD74HC109E can also be used in multiplexer circuits. It is used to multiplex two or more signals into a single output.
• Data communication: CD74HC109E can be used in data communication circuits as a data receiver and transmitter. It can receive and transmit data between two endpoints.

Working principle
CD74HC109E works in a very simple way. It has two input terminals, A and B, and two output terminals, Q and Q’. If a logic ‘0’ is applied to the input terminal A and a logic ‘1’ is applied to the input terminal B, then the output terminal Q will be in a logic ‘1’ state and the output terminal Q’ will be in a logic ‘0’ state. Similarly, if the input is reversed and a logic ‘0’ is applied to input terminal B and a logic ‘1’ is applied to input terminal A then the output terminal Q will be in a logic ‘0’ state and the output terminal Q’ will be in a logic ‘1’ state.
CD74HC109E also has two control terminals, CLK (clock) and CLR (clear). The CLK terminal is used to control the operation of the flip-flop, while the CLR terminal is used to reset the flip-flop in case of a fault. When the CLK terminal is in a logic ‘1’ state, the flip-flop will be triggered and the output will be updated according to the inputs. If there is no logic ‘1’ applied to the CLR terminal, the flip-flop will remain in the same state.
CD74HC109E is a static device, meaning that it does not require additional power for operation. It is also quite fast and reliable and can operate from -65°C to 125°C temperature range.
Conclusion
CD74HC109E is a very useful integrated circuit, which has many applications. It can be used in digital circuits, such as processor or controller circuits, sequencers, counter circuits, comparator circuits, multiplexer, and data communication circuits. It operates on a very simple logic, which makes it easy to use and understand. It is also a static device, and can operate within a wide range of temperatures.

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