DM74AS280M

Series:	74AS
Packaging:	Tube
Part Status:	Obsolete
Logic Type:	Parity Generator/Checker
Number of Circuits:	9-Bit
Current - Output High, Low:	2mA, 20mA
Voltage - Supply:	4.5V ~ 5.5V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SOIC
Base Part Number:	74AS280

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The DM74AS280M logic family is a parity generator and checker device. The device is designed to detect and correct single-bit errors in data. It is a single-chip integrated circuit that functions as a parity generator or checker. As a parity generator, it takes in parallel data inputs and provides a single output. The output is a parity bit that indicates whether there are an even or odd number of logic 1s on the input ports. As a parity checker, the DM74AS280M takes in a single data input and a single parity input and provides two outputs; one is a valid data output and the other is a parity error output.The DM74AS280M is widely used in communications, data transmission and storage, and in various other systems that require secure and reliable data. The device is also often used in fault tolerant and secure system architectures. With its different modes of operation, the DM74AS280M offers a wide range of applications which combine data reliability and speed, making it an ideal choice for a variety of industrial and consumer applications.The DM74AS280M has four data input pins (A0-A3) and four parity input/output pins (B0-B3). It has two control pins (C1 and C2) to select the operating mode. There are two operating modes: parity generator and parity checker. In parity generator mode, the data present on the A pins is used to generate a parity bit at the B pins. The C1 and C2 pins are programmed to select the parity mode. The generated parity bit (B3) depends on the number of logic 1s present on the A pins. The parity bit is 1 if there are even number of logic 1s, and 0 if there are odd number of logic 1s. In parity checker mode, the data present on the A pins is compared with the parity bit on the B pins to detect any single-bit errors. The C1 and C2 pins are programmed to select the parity mode. The B3 pin provides a valid data output if there is no single-bit error. When there is an error, the B3 pin provides an error signal.The DM74AS280M has an extremely low power dissipation of only 1.3 mW/MHz and operates down to 1.5V. It has an industry-standard SOIC package for maximal utility and flexibility of use. The operating temperature range of the device is between 0 °C to 70 °C.Apart from single bit parity checking and correction, the DM74AS280M can also be used to detect and correct multi-bit errors using a CRC (Cyclic Redundancy Check). It can also be used for detecting and correcting bad addresses, data units, and bytes.Overall, the DM74AS280M is a very useful device when it comes to detecting and correcting data errors in systems. It is an ideal choice for a variety of applications where data reliability and speed are key requirements. Its features, low power consumption and wide operating temperature range make it an attractive choice for consumer, industrial and communications applications.

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