SN74LS280

SN74LS280 9−Bit Odd/Even Parity Generators/Checkers The SN74LS280 is a Universal 9-Bit Parity Generator / Checker. It features odd / even outputs to facilitate either odd or even parity. By cascading, the word length is easily expanded. The LS280 is designed without the expander input implementation, but the corresponding function is provided by an input at Pin 4 and the absence of any connection at Pin 3. This design permits the LS280 to be substituted for the LS180 which results in improved performance. The LS280 has buffered inputs to lower the drive requirements to one LS unit load. Generates Either Odd or Even Parity for Nine Data Lines Typical Data-to-Output Delay of only 33 ns Cascadable for n-Bits Can Be Used To Upgrade Systems Using MSI Parity Circuits Typical Power Dissipation = 80 mW INPUTS VCC F E D C B A 14 13 12 11 10 9 8 F ED CB G A R R H I EVEN ODD 12 GH INPUTS 345 NC I R EVEN INPUT 67 R ODD GND OUTPUTS FUNCTION TABLE NUMBER OF INPUTS A THRU 1 THAT ARE HIGH OUTPUTS ∑EVEN ∑ODD 0, 2, 4, 6, 8 1, 3, 5, 7, 9 H L L H H = HIGH Level, L = LOW Level GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current − High IOL Output Current − Low −0.4 mA 8.0 mA http://onsemi.com LOW POWER SCHOTTKY 14 1 PLASTIC N SUFFIX CASE 646 14 1 SOIC D SUFFIX CASE 751A 14 1 SOEIAJ M SUFFIX CASE 965 ORDERING INFORM...