Arithmetic Logic Unit/function Generator

The 74HC181 is a high speed CMOS ARITHMETIC Logic UNIT/FUNCTION GENERATOR fabricated with silicon Gate C2 MOS technology. It has the same highspeed performance ofLSTTL combined withtrue CMOS low power consumption. These circuits per- form 16 binary arithmetic operations on two 4-bit words as shown in tables 1 and 2. These operations are selected by the four function-select lines (S0, S1, S2, S3) andinclude addition, subtraction, decrement, and straight transfer. When performing arithmetic manipulations, theinternal carriesmust be enabled by applying a low-level voltage to themode control input (M). Afull carry look-ahead scheme ismade available in these devices for fast, simultaneous carry gener- ation by means of two cascade-outputs (pins 15 and 17) for thefourbits in the package. Whenused in con- junction with theM54HC182 or M74HC182, full carry look-ahead circuits, high-speed arithmetic operations CAN be performed. These circuits will accomodate ac- tive-high oractive-low data, if the pin designations are interpreted as shown below. Subtraction is accom- plished by 1,s complement addition where the 1s complement of thesubtrahend is generated internally. The resultant output is 1B1, which requires an end- around or forced carry to produce AB. The 181 CAN also be utilized as a Comparator The A = B output is internally decoded from the function outputs (F0, F1, F2, F3) so that when two words of equal magnitude are applied at the Aand Binputs, itwill assume a high level to indicated equality (A = B). The ALUshould be By STMicroelectronics
M74HC181 's PackagesM74HC181 's pdf datasheet



M74HC181 Pinout, Pinouts
M74HC181 pinout,Pin out
This is one package pinout of M74HC181,If you need more pinouts please download M74HC181's pdf datasheet.

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