74HC221D,652

Series:	74HC
Packaging:	Tube
Part Status:	Obsolete
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	Yes
Propagation Delay:	19ns
Current - Output High, Low:	5.2mA, 5.2mA
Voltage - Supply:	2V ~ 6V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SO
Base Part Number:	74HC221

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Multivibrators are electronic logic circuits that have been an essential part of digital circuitry since the earliest days of computers. They are commonly used to generate time delays, detect pulse widths, and drive sequential logic circuits. Multivibrators can be constructed with a variety of logic gate types, as well as discrete transistors, chips, and integrated circuits.The 74HC221D,652 is a type of multivibrator integrated circuit (IC) that uses bipolar CMOS (Complementary Metal-Oxide Semiconductor) technology. It can be used in a variety of applications, including digital signal processing, signal conditioning, clock/timing generation, gating and switching logic levels.The 74HC221D,652 is composed of two main sections—a 0.45 micrometer capability BiCMOS device and a Schmitt trigger. The BiCMOS device controls the Schmitt trigger, which is also known as a ripple-carry output buffer. The Schmitt trigger output is designed to keep the circuit steady during its operation, while the BiCMOS device is responsible for driving the two outputs in response to the input signal.The 74HC221D,652 can be configured in two basic configurations: a monostable multivibrator (also known as a one-shot) and an astable multivibrator (also known as a free-running oscillator). In the monostable configuration, the 74HC221D,652 can be used to generate a single pulse; in the astable configuration, it can be used to produce a continuous pulse train.In the monostable configuration, the 74HC221D,652 is triggered by an externally applied pulse that causes the voltage at the trigger input (TRIG) to switch from a low to a high level. This causes the output pulse at the output lead to change from a low to a high level. The pulse then remains in the high state for the duration of the pulse width before returning to the low state. The pulse width is determined by the RC time constant of the external capacitor and resistor connected to the circuit.In the astable configuration, the 74HC221D,652 produces a continuous pulse train at the output terminal by cycling continuously between the two output states. The astable configuration requires two externally-applied pulses to trigger the multivibrator: one to start the cycle, and another to stop the cycle. The delay between the two triggers determines the frequency of the pulse train generated.The 74HC221D,652 features a wide operating temperature range of -40 to +85 degrees Celsius and can operate at a voltage ranging from 2 to 5.5 volts. It can handle up to 5 mA of output current and has a peak power dissipation of 200 mW. It is also compatible with high speed logic families such as AC/ACT, ALVC and AV/LV.The 74HC221D,652 is a highly reliable, cost-effective and easy-to-use device and can be used in a wide variety of applications, such as in digital signal processing, signal conditioning, clock/timing generation and gating/switching logic levels. When configured as an astable multivibrator, it can be used to generate continuous pulse trains, while its monostable configuration can be used to generate a single, high-level output pulse with a fixed width. The 74HC221D,652 is an ideal choice for use in many types of logic applications, and it provides reliable and stable performance.

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