CD74HC4538E

Series:	74HC
Packaging:	Tube
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	21ns
Current - Output High, Low:	5.2mA, 5.2mA
Voltage - Supply:	2V ~ 6V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-PDIP
Base Part Number:	74HC4538

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Multivibrators are types of circuit that are commonly used for producing a periodic timing pulse in order to control the sequences of operations of digital circuits or computer operations. The lack of self-triggering ability means that multivibrators are used to detect an input signal before generating a timed pulse. The CD74HC4538E is a CMOS logic integrated circuit used as a monostable / astable multivibrator.The CD74HC4538E consists of four inverters and two CMOS high monostable/ astable multivibrators that feature active-low outputs. It also features Schmitt trigger inputs which act as noise filters to improve the noise immunity. The application and use of the CD74HC4538E is very diverse and includes the generation of single trigger pulses to the generation of synchronized astable waveforms. It can also be used as a crystal oscillator, , as a clock generator and for process control of computer systems. CD74HC4538E Working Principle:The monostable/ astable multivibrator is widely used for generating continuous pulses for timing and for generating pulses with duration depending on select inputs. The function of the multivibrator is to produce a pulse of fixed set duration that is triggered by an external input. The duration of the output pulse is rather a function of the time period of the multivibrator.The monostable/ astable multivibrator consists of two CMOS inverters and two trimming capacitors that control the timing of the circuit. When the input is applied, the low-to-high transition of the input signal changes the output of the first inverter, causing the output of the second inverter to toggle. The output of the second inverter will remain at a low state until the time determined by the time constant of C1 and R1 or C2 and R2, has elapsed. Once the time has elapsed, the output of the second inverter will toggle and the pulse is generated.The astable multivibrator produces two complementary output signals that are out of phase with each other. This allows for square waves of fixed frequency to be generated. The frequency of the generated signal is a function of the time constant of C1, C2, R1 and R2. The astable multivibrator also has a dual mode in which the input is enabled and disabled by the state of two inputs. This allows for a continuously repeating square wave to be generated by controlling the input signals.In conclusion, the CD74HC4538E can be used as a monostable or astable multivibrator with the capability of either generating a single trigger pulse or synchronized astable waveforms on command. This makes it a very versatile device that is well-suited for applications such as process control and digital circuit timing.

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