74AC280SJX

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The 74AC280SJX is an 8-bit parity generator/checker that is found in multiple applications including a parity generator for computers, a high reliability parity checker for memories and an odd even checker for memories that are susceptible to soft errors. The 74AC280SJX is a parity/checker generator with an asynchronous active-low input that is used to generate odd, even or both odd/even parity on 8-bits of data. It consists of 8 XOR gates that are connected in a parallel fashion. This circuit takes 8 bits of data and allows the user to select odd, even or both parity operations. When used with a 9-bit (1 bit for parity) memory device, the 74AC280SJXcan check and generate the parity bit. When the 1 bit parity is high, it is an odd parity. If the 1 bit parity bit is low, it is an even parity.

The 74AC280SJXcomputes and stores an 8-bit odd/even parity checker and enables a user to quickly detect memory errors and soft errors. The inputs of the circuit are standard TTL-compatible and can be used for a variety of applications. The outstanding feature of the 74AC280SJX is that it is glitch-proofed, meaning that it will not generate a false output in the event of simultaneous, repeating signals at the inputs. The main purpose of the 74AC280SJX is to generate or check a parity. The parity bit is used to detect single bit errors in the data it is applied to. By combining the data bits plus the parity bit, the circuit can detect single bit errors, but is unable to detect multiple simultaneous bit errors.

The 74AC280SJX typically has eight data inputs (D1 - D8) which are typically used with 8 bits of data. The data inputs are TTL compatible and receive the data being checked or generated. This data is then sent to the parity generator circuit. The parity generates a single parity output (P) which is used to indicate whether the data it is applied to contains an error or not. This single bit (parity output P) is the result of all the inputs being XOR together. All the data inputs and the parity output (P) are driven through inverters. This ensures that the parity output will be the inverse of the logic level of the data inputs, regardless of clock status.

The 74AC280SJX can act as either an odd or even parity generator/checker depending on the user’s application. The user has the option of selecting an odd, even or a combination odd/even parity check simply by setting the appropriate signal at the A/E input. When the A/E input is set to logic 1, the parity generator/checker will generate an odd parity signal. This signal indicates that the number of logic 1s in the 8-bit data is odd. When the A/E input is set to logic 0, the parity generator/checker will generate an even parity signal. This signal indicates that the number of logic 1s in the 8-bit data is even.

The 74AC280SJX can also be used to detect single errors in data as it is transferred between components or entered into a memory. When an even or odd parity is observed, it indicates that the data has been successfully transferred and no errors have occurred. If an odd or even parity is not observed, it indicates that an error has occurred and the error must be identified and corrected.

The 74AC280SJX can be used in a variety of systems such as parity checking of systems, error detection in memories, and even parity checking of systems with multiple data inputs. It is widely used in computers, microcontrollers, digital signal processors, etc. The 74AC280SJX is used to provide better reliability and integrity when transferring data in potentially noisy environments.

In conclusion, the 74AC280SJX is an 8-bit parity generator/checker that is found in multiple applications including a parity generator for computers, a high reliability parity checker for memories and an odd/even checker for memories that are susceptible to soft errors. It is used to detect single bit errors in a data set. The user has the option of selecting an odd, even or combination odd/even parity check simply by setting the appropriate signal at the A/E input. The 74AC280SJX can be used in a variety of systems such as parity checking of systems and memory error detection, providing better reliability and integrity when transferring data in potentially noisy environments.

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