74F381 4-Bit Arithmetic Logic Unit General Description Features The 'F381 performs three arithmetic and three logic operations on two 4-bit 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 'F182 carry lookahead generator for high-speed expansion to longer word lengths. For ripple expansion, refer to the 'F382 ALU data sheet. Y Commercial Package Number Y Y Y 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 lookahead generator Package Description 20-Lead (0.300x Wide) Molded Dual-In-Line 74F381PC N20A 74F381SC (Note 1) M20B 20-Lead (0.300x Wide) Molded Small Outline, JEDEC 74F381SJ (Note 1) M20D 20-Lead (0.300x Wide) Molded Small Outline, EIAJ Note 1: Devices also available in 13x reel. Use suffix e SCX and SJX. Logic Symbols Connection Diagram Pin Assignment for DIP and SOIC TL/F/9528 - 3 IEEE/IEC TL/F/9528 - 1 TL/F/9528 - 6 C1995 National Semiconductor Corporation TL/F/9528 RRD-B30M105/Printed in U. S. A. 74F381 4-Bit Arithmetic Logic Unit August 1995 Unit Loading/Fan Out 74F Pin Names A 0 - A3 B 0 - B3 S0 - S2 Cn G P F0 - F3 Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL A Operand Inputs B Operand Inputs Function Select Inputs Carry Input Carry Generate Output (Active LOW) Carry Propagate Output (Active LOW) Function Outputs 1.0/3.0 1.0/3.0 1.0/1.0 1.0/4.0 50/33.3 50/33.3 50/33.3 20 mA/b1.8 mA 20 mA/b1.8 mA 20 mA/b0.6 mA 20 mA/b2.4 mA b 1 mA/20 mA b 1 mA/20 mA b 1 mA/20 mA Functional Description Signals applied to the Select inputs S0 - S2 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 'F182 carry lookahead generator for expansion to longer word length, as shown in Figure 1 . Note that an 'F382 ALU is used for the most significant package. Typical delays for Figure 1 are given in Figure 2 . Function Select Table FIGURE 2. 16-Bit Delay Tabulation Select Operation Path Segment Toward F Output Cn a 4, OVR L L L L Clear B Minus A A Minus B A Plus B Ai or Bi to P Pi to Cn a ('F182) Cn to F Cn or Cn a 4, OVR 7.2 ns 6.2 ns 8.1 ns 7.2 ns 6.2 ns 8.0 ns Total Delay 21.5 ns 21.4 ns H H H H AZB AaB AB Preset S0 S1 S2 L H L H L L H H L H L H L L H H H e HIGH Voltage Level L e LOW Voltage Level TL/F/9528 - 4 FIGURE 1. 16-Bit Lookahead Carry ALU Expansion 2 Logic Diagram TL/F/9528 - 5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 Truth Table Inputs Outputs Function S0 S1 S2 Cn An Bn F0 F1 F2 F3 G CLEAR L L L X X X L L L L L L L L L L L H H H H L L H H L L H H L H L H L H L H H L L H L H H L H H L H L H L L H H L H L H L L H H L H L H L L H L H H H L H H L L H L L L H L L L L L H H H H L L H H L L H H L H L H L H L H H L L H L H H L H L H H L L H L H L H H L L H L H L H H L L H L H H L H H H L H L H L L L H L L L L L L H H H H L L H H L L H H L H L H L H L H L H H L H L L H L H H H L L L H L H H H L L L H L H H H L L L H H H H L H H H L H L L L H L L L X X X X L L H H L H L H L H H L L H H L L H H L L H H L H H H L H H L L X X X X L L H H L H L H L H H H L H H H L H H H L H H H H H H H H H H L X X X X L L H H L H L H L L L H L L L H L L L H L L L H L H L H L H L L X X X X L L H H L H L H H H H H H H H H H H H H H H H H H H H H H H H L B Minus A A Minus B A Plus B A Z B AaB AB PRESET H L H L H L H L H H L L H H L L H H H H H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial 4 P Absolute Maximum Ratings (Note 1) Recommended Operating Conditions b 65 C to a 150 C Storage Temperature Ambient Temperature under Bias b 55 C to a 125 C Junction Temperature under Bias Plastic b 55 C to a 175 C b 55 C to a 150 C VCC Pin Potential to Ground Pin Free Air Ambient Temperature Commercial 0 C to a 70 C Supply Voltage Commercial a 4.5V to a 5.5V b 0.5V to a 7.0V b 0.5V to a 7.0V Input Voltage (Note 2) b 30 mA to a 5.0 mA Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) b 0.5V to VCC Standard Output b 0.5V to a 5.5V TRI-STATEE Output Current Applied to Output in LOW State (Max) twice the rated IOL (mA) Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Note 2: Either voltage limit or current limit is sufficient to protect inputs. DC Electrical Characteristics Symbol 74F Parameter Min VIH Input HIGH Voltage VIL Input LOW Voltage Typ Units 2.0 VCD Input Clamp Diode Voltage VOH Output HIGH Voltage 74F 10% VCC 74F 5% VCC VOL Output LOW Voltage 74F 10% VCC IIH Input HIGH Current 74F IBVI Input HIGH Current Breakdown Test 74F ICEX Output HIGH Leakage Current 74F VID Input Leakage Test 74F IOD Output Leakage Circuit Current 74F IIL Input LOW Current IOS Output Short-Circuit Current ICC Power Supply Current V Recognized as a HIGH Signal V Recognized as a LOW Signal b 1.2 V Min IIN e b18 mA V Min IOH e b1 mA IOH e b1 mA 0.5 V Min 5.0 mA 7.0 mA Max VIN e 7.0V 50 mA Max VOUT e VCC V 0.0 IID e 1.9 mA All Other Pins Grounded 3.75 mA 0.0 VIOD e 150 mV All Other Pins Grounded b 0.6 b 1.8 b 2.4 mA mA mA Max Max Max VIN e 0.5V (Sn) VIN e 0.5V (An, Bn) VIN e 0.5V (Cn) b 150 mA Max VOUT e 0V 89 mA Max 4.75 59 5 Conditions 0.8 2.5 2.7 b 60 VCC Max IOL e 20 mA VIN e 2.7V AC Electrical Characteristics Symbol Parameter 74F 74F TA e a 25 C VCC e a 5.0V CL e 50 pF TA, VCC e Com CL e 50 pF Units Min Typ Max Min Max tPLH tPHL Propagation Delay Cn to Fi 2.5 2.5 8.1 5.7 12.0 8.0 2.5 2.5 13.0 9.0 ns tPLH tPHL Propagation Delay Any A or B to Any F 4.0 3.5 10.4 8.2 15.0 11.0 4.0 3.5 16.0 12.0 ns tPLH tPHL Propagation Delay Si to Fi 4.5 4.0 8.3 8.2 20.5 15.0 4.5 4.0 21.5 16.0 ns tPLH tPHL Propagation Delay Ai or Bi to G 3.5 3.5 6.4 6.8 10.0 10.0 3.5 3.0 11.0 11.0 ns tPLH tPHL Propagation Delay Ai or Bi to P 2.5 3.5 7.2 6.5 10.5 9.5 2.5 3.5 11.5 10.5 ns tPLH tPHL Propagation Delay Si to G or P 4.0 4.5 7.8 10.2 12.0 13.5 4.0 4.5 13.0 14.5 ns Ordering Information The device number is used to form part of a simplified purchasing code where the package type and temperature range are defined as follows: 74F 381 S C X Temperature Range Family 74F e Commercial Special Variations X e Devices shipped in 13x reel Device Type Temperature Range C e Commercial (0 C to a 70 C) Package Code P e Plastic DIP S e Small Outline SOIC JEDEC SJ e Small Outline SOIC EIAJ 6 Physical Dimensions inches (millimeters) 20-Lead (0.300x Wide) Molded Small Outline Package, JEDEC (S) NS Package Number M20B 20-Lead (0.300x Wide) Molded Small Outline Package, EIAJ (SJ) NS Package Number M20D 7 74F381 4-Bit Arithmetic Logic Unit Physical Dimensions inches (millimeters) (Continued) 20-Lead (0.300x Wide) Molded Dual-In-Line Package (P) NS Package Number N20A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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