Part  74F381PC 
Category  
Title  Bipolar>F Family 
Description  4Bit Arithmetic Logic Unit 
Company  Fairchild Semiconductor 
Datasheet  Download 74F381PC datasheet

Cross ref.  Similar parts: SN54F521 
Quote 
Features, Applications 
The 74F381 performs three arithmetic and three logic operations on two 4bit words, A and B. Two additional select input codes force the function outputs LOW or HIGH. Carry propagate and generate outputs are provided for use with the 74F182 carry lookahead generator for highspeed expansion to longer word lengths. For ripple expansion, refer to the 74F382 ALU data sheet. Featuress Low input loading minimizes drive requirements s Performs six arithmetic and logic functions s Selectable LOW (clear) and HIGH (preset) functions s Carry generate and propagate outputs for use with carry lookahead generator Order Number 74F381SJ 74F381PC Package Number M20D N20A Package Description 20Lead Small Outline Integrated Circuit (SOIC), JEDEC MS013, 0.300 Wide 20Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20Lead Plastic DualInLine Package (PDIP), JEDEC MS001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Pin Names P F0F3 Description A Operand Inputs B Operand Inputs Function Select Inputs Carry Input Carry Generate Output (Active LOW) Carry Propagate Output (Active LOW) Function Outputs U.L. HIGH/LOW Input IIH/IIL Output IOH/IOL µA/2.4 mA 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 levels is shown in the Truth 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 lookahead generator for expansion to longer word length, as shown in Figure 2. Note that an 74F382 ALU is used for the most significant package. Typical delays for Figure 2 are given in Figure 1. Operation Clear B Minus A Minus B A Plus A B A+B AB PresetInputs Function CLEAR L Cn Minus Plus AB A+B AB PRESET H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 
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