M74HC280B1R

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The M74HC280B1R is a TTL compatible high speed bipolar advanced high performance CMOS logic IC belonging to the Logic - Parity Generators and Checkers family. It is a 8-bit parity generator and checker. With two integrated enable logic blocks, this device performs the generation of even parity, or the check of parity for 8 bit data words.--

The enable logic consists of two input terminals (EN1 and EN2): EN1 enables parity generation to begin with the negative going transition of EN1, and EN2 enables parity check to begin with the positive going transition of EN2.

The M74HC280B1R has an 8-bit Odd Parity (ODD) and Even Parity (EVEN) output pins to indicate the result of the parity check. The ODD pin will be active high with an odd number of 1s in the data. The EVEN pin will be active high with an even number of 1s in the data.

The device also features two logic outputs: ST and STP. The ST output is the parity-check indication, while the STP output is the parity-check indication and the enabled logic output.

M74HC280B1R has a wide variety of application fields, encompassing a range of industries such as automotive, audio, broadcasting, consumer electronics and communication. In the automotive industry, for instance, it can be used in vehicle brake systems, engine tachometers, anti-lock brake systems ground sensors, speedometers and so on. It can also be used to generate and check even/odd parity bits for secure or data communications, or for error correction on any given data stream.

In terms of working principle, the device performs two functions. First, it generates an even parity output, indicating the parity of the 8-bit data word, which can be used as a checksum. Second, to check if the data bits are even or odd, it executes a parity-check. This can be done by inputting the data in the device\'s D input pins and setting the corresponding OE and EN control pins. If the odd parity-check is enabled, then the ODD pin will output a logic “1” when the input data contains an odd number of “1s” and a logic “0” when the input data contains an even number of “1s”. Similarly, for the even parity-check, the EVEN pin will output a logic “1” when the input data contains an even number of “1s” and a logic “0” when the input data contains an odd number of “1s”.

In conclusion, the M74HC280B1R is a very versatile TTL compatible high speed bipolar logic IC belonging to the Logic - Parity Generators and Checkers family, which is ideal for a wide range of applications. This device has two enable blocks that enable parity generation or check as well as two logic outputs; ST and STP. It can perform either parity generation or parity check on 8 bit data words and outputs the result via two dedicated logic pins, ODD and EVEN.

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