Series:	74HC
Packaging:	Tube
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	18ns
Current - Output High, Low:	5.2mA, 5.2mA
Voltage - Supply:	2V ~ 6V
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	74HC221

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Introduction to the CD74HC221PWG4

The CD74HC221PWG4 is a type of monostable multivibrator---a single-shot pulse generator---manufactured by Texas Instruments. It is part of the CD74HC221 generation of multivibrators, a series of medium-speed CMOS logic integrated circuits.

Application Field

A CD74HC221PWG4 is used to generate a single output pulse of a predetermined width and time-delay when triggered by a low-to-high signal transition. The main application fields of the CD74HC221PWG4 include:

• Asynchronous bistables
• Delayed pulses
• Stored program control
• Time-outs
• Counter enabling
• Sequential control
• Timers

The versatility of this monostable multivibrator also enables it to be used for applications such as 1-bit shift registers and Set-Reset Flip-Flops.

Features

The CD74HC221PWG4 has several features that make it highly desirable for logic applications. It has very low input current, ensuring low output levels, and a guaranteed low power consumption and fast switching performance. Similarly, the device comes with low input threshold voltage, allowing it to operate directly with TTL levels. Also, it has improved noise margin levels, meaning that it can operate in noisy environments without compromising the outputs.

Working Principle

The underlying principle behind the CD74HC221PWG4 is based on a single-shot monostable multivibrator, which provides positive and negative pulse output when triggered. The device is triggered by a low-to-high signal transition and produces an output pulse of a predetermined width and time-delay. The CD74HC221PWG4 comprises two CMOS Schmitt trigger inverters connected in parallel with their output signals connecting together. A resistor, connected between ground and the output terminal and a capacitor, connected between the output terminal and the input terminal of one of the two inverters, form a basic R-C circuit that helps to describe the operation of the single-shot multivibrator. The device is initiated when a low-to-high transition is applied to the input terminal of the inverter. This causes the capacitor to begin charging and when it reaches the inverter input threshold value of logic 1, the inverter’s output goes high and remains on until the discharging of the capacitor is completed. The capacitor is discharging through the resistor, The output pulse width of the device is a function of R and C values and the maximum pulse width can be increased by increasing either the resistor or the capacitor value.

Conclusion

The CD74HC221PWG4 is a type of monostable multivibrator manufactured by Texas Instruments. It serves to generate single pulses of predetermined width and time-delay when triggered by a low-to-high transition. Its application fields include asynchronous bistables, delayed pulses, stored program control, time-outs, counter enabling, sequential control, and timers. The device has several features that make it attractive for logic circuits, such as low input current, low power consumption and fast switching performance, as well as improved noise margin levels. Its working principle is based on a single-shot monostable multivibrator, comprising two CMOS Schmitt trigger inverters and a basic R-C circuit.

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