Details, datasheet, quote on part number: 74F381
CategoryLogic => Arithmetic Functions => Bipolar->F Family
TitleBipolar->F Family
DescriptionArithmetic Logic Unit
CompanyPhilips Semiconductors (Acquired by NXP)
DatasheetDownload 74F381 datasheet
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Features, Applications


Low-input loading minimizes drive requirements Performs six arithmetic and logic functions Selectable Low (clear) and High (preset) functions Carry Generate and Propagate outputs for use with Carry


The 74F381 performs three arithmetic and three logic operations on two 4-bit words, A and B. Three additional Select (S0S2) input codes force the Function outputs Low or High. Carry Propagate (P) and Generate (G) ouputs are provided for use with the 74F182 Carry Look Ahead Generator for high-speed expansion to longer word lengths. For ripple expansion, refer to the 74F382 ALU data sheet. Signals applied to the Select inputs (S0S2) determine the mode of operation, as indicated in the Function Select Table. An extensive listing of input and output function levels is shown in the Function Table. The circuit performs the arithmetic functions for either active-HIgh or active-Low operands, with output levels in the same convention. In the subtract operating modes, it is necessary to force a Carry (High for active-HIgh operands, Low for active-Low operands) into the Cn input of the least significant package. The Carry Generate (G) and Carry Propagate (P) outputs supply input signals to the 74F182 Carry look-ahead generator for expansion to longer word length, as shown in Figure 1. Note that a 74F382 ALU is used for the most significant package. Typical delays for Figure 1 are given in Table 1.

DESCRIPTION 20-pin plastic DIP 20-pin plastic SO COMMERCIAL RANGE VCC 5V 10%, Tamb N74F381N N74F381D

PINS G A operand inputs A operand inputs Function select inputs Carry input Carry Propagate ouptut (active-Low) Carry Generate ouptut (active-Low) DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW 20A/2.4mA 1.0mA/20mA

F0F3 Outputs NOTE: One (1.0) FAST unit load is defined 20A in the High state and 0.6mA in the Low state.


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0-C     D-L     M-R     S-Z