SN74LS221DG4

Series:	74LS
Packaging:	Tube
Part Status:	Active
Logic Type:	Monostable
Independent Circuits:	2
Schmitt Trigger Input:	No
Propagation Delay:	45ns
Current - Output High, Low:	400µA, 8mA
Voltage - Supply:	4.75V ~ 5.25V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74LS221

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The SN74LS221DG4 is a dual D-type flip-flop logic device that has been classified as a Logic – Multivibrator. It is a device that utilizes pulses to start and stop a signal in the circuit, and can be used in circuits such as those used in frequency shift keying (FSK), digital clock generators, noise generators and signal conditioning circuits. This device can also be used to sequence circuits and demultiplex digital data.The SN74LS221DG4 is an integrated circuit (IC) that contains two edge-triggered D type flip flops. These flip flops are used to store and transfer digital data by responding to clock pulses. The input to the two flip flops (Q and Q/N) can be controlled by the inputs included in the device: J and K.The operating mode of the SN74LS221DG4 is slightly different from other flip flops. When the clock pulse is set to 0, J and K are in their logic levels. The voltage shift between 0 and 1 not only sets the logic level of J and K, but also initiates the transfer of the existing data stored in the circuit. This transfer occurs at the same time as the logic levels of J and K change from 0 to 1.In addition to the two inputs, J and K, the SN74LS221DG4 also has four outputs: Q,  Q/N, Q/T and Q/T/N. Q and Q/N are the standard outputs of the flip flop. Q is the output when the logic level of J and K are both 0, and the logic level of Q/N is the inverse. Q/T and Q/T/N are the outputs of the opposite flip flop. So, while the logic level of one of the devices is 0, the logic level of the other will be 1. The SN74LS221DG4 can be used in a wide variety of applications, including frequency shift keying, digital clock generation and signal conditioning. The device has been used in FSK systems for transmitting data over a specified frequency. The device can also be used in digital clock generation applications, such as the generation of low frequency clock signals. For signal conditioning applications, the device can be used to sequence signals or eliminate noise from a signal. The SN74LS221DG4 can also be used to demultiplex digital data. Demultiplexing is the process of splitting a signal into multiple signals. This device can be used to separate a signal into individual bits, and then the individual bits can be used to control devices in the circuit. In summary, the SN74LS221DG4 can be classified as a Logic – Multivibrator and functions by initiating the transfer of data stored in the circuit when pulses are sent to the two input pins J and K. The device can be used in a variety of applications, such as frequency shift keying, digital clock generation and signal conditioning, and can also be used to demultiplex digital data.

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