74AC821SC

Max Propagation Delay @ V, Max CL:	9.5ns @ 5V, 50pF
Base Part Number:	74AC821
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	4.5pF
Current - Quiescent (Iq):	80µA
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74AC
Clock Frequency:	160MHz
Number of Bits per Element:	10
Number of Elements:	1
Output Type:	Tri-State, Non-Inverted
Type:	D-Type
Function:	Standard
Part Status:	Obsolete
Packaging:	Tube

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Logic - Flip Flops: 74AC821SC Application Field and Working Principle

Logic flip flops are electronic circuits that are used to store one bit of digital information. They are the fundamental building blocks of digital electronics and provide the basic storage of data. The 74AC821SC flip flop is an integrated circuit (IC) which is widely used in a variety of applications including digital logic, computer memory systems, and digital signal processing. This article will discuss the application field and working principle of the 74AC821SC logic flip flop.The 74AC821SC is a low power CMOS logic flip flop, which can operate at voltages ranging from 2.0V to 3.6V. It is a dual D-type flip flop that is typically used when a single device is needed to store multiple bits of data. It is capable of operating at speed up to 25MHz and offers a low propagation delay time. The 74AC821SC uses two data lines, D1 and D2, which can be used independently or entered together to store two separate bits of information simultaneously. This makes it an ideal choice for applications such as parallel-to-serial converters and shift registers.The 74AC821SC also can be used in frequency division applications, by utilizing the two data lines, D1 and D2, each at one half of the oscillation frequency of the input clock signal. In addition, the 74AC821SC can be used as a synchronizer for data transmission systems, buffers for memory access and address decoding, as well as for edge detection.In order to understand how the 74AC821SC works, it is important to understand the concept of logical flip flops. A logic flip-flop is an electronic circuit that is used to store one bit of digital information. They contain two states: a set state which is represented by a ‘1’ and a reset state which is represented by a ‘0’. The state of the flip-flop is determined by the presence or absence of two control signals, usually referred to as the set and reset inputs. When both signals are absent, the output of the flip-flop remains in its initial state.In the case of the 74AC821SC, the two control signals are referred to as the clock signal (CLK) and the data signal (D). Depending on the clock signal and data signal, the output of the flip-flop can change to either the ‘1’ or ‘0’ state. When the clock signal transitions from ‘0’ to ‘1’, the output of the flip-flop will switch to the state of the data signal (D) input. Similarly, when the clock signal transitions from ‘1’ to ‘0’, the output will remain as the state of the data signal (D) input.The 74AC821SC operates in a toggle mode. This mode allows the user to control the output of the flip-flop by inputting a signal to the data signal input (D). When the data signal (D) is ‘1’ and the clock signal (CLK) is ‘1’, the output of the flip-flop is ‘1’, regardless of the state of the previous output. Similarly, when the data signal (D) is ‘0’ and the clock signal (CLK) is ‘1’, the output of the flip-flop is ‘0’, regardless of the state of the previous output. This feature allows the user to toggle the output of the flip-flop without the use of two separate control signals (set and reset).The 74AC821SC also features a ‘lock’ feature, which allows the user to control whether the output of the flip-flop is locked or unlocked. When the ‘lock’ signal is in a ‘high’ state, the output of the flip-flop is held in its current value (if D1 and D2 remain equal). When the ‘lock’ signal is in a ‘low’ state, the output of the flip-flop can be changed by toggling the data signal (D).The 74AC821SC is a versatile and reliable flip flop that is used in a wide range of applications. The two data lines, D1 and D2, allow the user to store multiple bits of data in a single device. The ‘toggle’ and ‘lock’ features allow the user to control the output of the flip-flop in a number of ways. The low power consumption and high speed operation makes the 74AC821SC an ideal choice for applications requiring quick and reliable storage of data.

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