# Flip-Flops

"Flip-flop" is the common name given to two-state devices which offer basic memory for sequential logic operations. Flip-flops are heavily used for digital data storage and transfer and are commonly used in banks called "registers" for the storage of binary numerical data.

 Other Two-State Devices
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Electronics concepts

Digital Circuits

Sequential Operations

Data Transfer

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# Multivibrators

Two-state devices called multivibrators are used extensively in digital electronics. The bistable multivibrators are called flip-flops and are the basic memory devices used in sequential logic. Other two-state devices include the astable multivibrator which serves as an oscillator and the monostable multivibrator ("one-shot" multivibrator) which can serve as a pulse source.

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# Astable Multivibrator

 The configuration of NAND gate inverters shown is one of many ways to create an astable multivibrator : a two-state device which is not stable in either state. If we start with point A high, then that high voltage charges the capacitor and after a time characteristic of the time constant RC will reach the threshold for switching A low and B high. Then the charging process will reverse until the transition back to the original state occurs. This circuit can be constructed from half of an IC7400 quad NAND gate.
 Multivibrators Flip-flops
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# Monostable Multivibrator

 In response to a positive trigger pulse the monostable multivibrator or "one-shot" will produce a single output pulse of length t determined by the value of the resistor and capacitor. The non-retriggerable one-shot will not respond to further trigger pulses which happen during its pulse length.
 Multivibrators Flip-flops
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Electronics concepts

Digital Circuits

Reference
Tocci
Digital Systems, Sec 5-22

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