DESCRIPTION
It is a 4 bit binary counter with Synchronous Clear. The circuits have four fundamental modes of operation, in order of preference: synchronous reset, parallel load, count-up and hold. Four control inputs, Master Reset (CLEAR), Parallel PIN CONNECTION AND IEC LOGIC SYMBOLS December 1998 1/11 74ACT163 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2 3, 4, 5, 6 7 10 9 14, 13, 12, 11 10 8 16 SYMBOL CLEAR CLOCK A, B, C, D NAME AND FUNCT ION Master Reset Clock Input (LOW-to-HIGH, Edge- Triggered) Data Inputs ENABLE P Count Enable Input ENABLE T Count Enable Carry Input LOAD QA to QD Parallel Enable Input Flip-Flop Outpus ENABLE T Count Enable Carry Input GND VCC Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S CLR L H H H H X NOTE: O UT PUT S TE X X L X H X CK QA L A QB L B QC L C QD L D FUNCT ION RESET TO ”0” PRESET DATA NO COUNT NO COUNT COUNT NO COUNT LD X L H H H X PE X X X L H X NO CHANGE NO CHANGE COUNT UP NO CHANGE X:Don’t Care A,B, C,D: Logic level o...
STMicroelectronics
