DESCRIPTION
The nine data inputs control the output conditions. When the number of high level inputs is odd, ΣODD output is kept high and ΣEVEN output low. Conversely, when the number is even , ΣEVEN output is kept high and ΣODD low. This IC generates either odd or even parity making it flexible application. The word-length capability is easily expanded by cascading. All inputs are equipped with protection circuits against static discharge and transient excess voltage. October 1992 NC = No Internal Connection 1/10 M54/M74HC280 INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE NUMBER OF INPUTS A THRU I THAT ARE HIGH 0, 2, 4, 6, 8 1, 3, 5, 7, 9 OUTPUT Σ EVEN H L Σ ODD L H LOGIC DIAGRAM 2/10 M54/M74HC280 PIN DESCRIPTION
PIN No 5, 6 8, 9, 10, 11, 12, 13, 1, 2, 4 3 7 14 SYMBOL Σ EVEN, Σ ODD A to I NAME AND FUNCTION Parity Outputs Data Inputs IEC LOGIC SYMBOL NC GND V CC No Connection Ground (0V) Positive Supply Voltage ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO ICC or IGND PD Tstg T...
STMicroelectronics
