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| SN54/74LS181 4-BIT ARITHMETIC LOGIC UNIT The SN54 / 74LS181 is a 4-bit Arithmetic Logic Unit (ALU) which can perform all the possible 16 logic, operations on two variables and a variety of arithmetic operations. * Provides 16 Arithmetic Operations Add, Subtract, Compare, Double, * Provides all 16 Logic Operations of Two Variables Exclusive -- OR, * Full Lookahead for High Speed Arithmetic Operation on Long Words * Input Clamp Diodes Compare, AND, NAND, OR, NOR, Plus Ten other Logic Operations Plus Twelve Other Arithmetic Operations 4-BIT ARITHMETIC LOGIC UNIT LOW POWER SCHOTTKY CONNECTION DIAGRAM DIP (TOP VIEW) VCC A1 24 23 B1 22 A2 21 B2 20 A3 19 B3 18 G Cn+4 17 16 P 15 A=B 14 F3 13 24 1 J SUFFIX CERAMIC CASE 623-05 N SUFFIX PLASTIC CASE 649-03 24 1 1 B0 2 A0 3 S3 4 S2 5 S1 6 S0 7 Cn 8 M 9 F0 10 F1 11 12 F2 GND ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN Ceramic Plastic NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. LOGIC SYMBOL PIN NAMES LOADING (Note a) HIGH A0 - A3, B0 - B3 S0 - S3 M Cn F0 - F3 A=B G P Cn+4 Operand (Active LOW) Inputs Function -- Select Inputs Mode Control Input Carry Input Function (Active LOW) Outputs Comparator Output Carry Generator (Active LOW) Output Carry Propagate (Active LOW) Output Carry Output 1.5 U.L. 2.0 U.L. 0.5 U.L. 2.5 U.L. 10 U.L. Open Collector 10 U.L. 10 U.L. 10 U.L. LOW 0.75 U.L. 1.0 U.L. 0.25 U.L. 1.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. 10 U.L. 5 U.L. 5 (2.5) U.L. 7 8 6 5 4 3 Cn M 2 1 23 22 21 20 19 18 A0 B0 A1 B1 A2 B2 A3 B3 Cn+4 A=B G P F1 10 F2 11 F3 13 16 14 17 15 S0 S1 S2 S3 F0 9 VCC = PIN 24 GND = PIN 12 NOTES: a. 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) b. Temperature Ranges. FAST AND LS TTL DATA 5-1 SN54/74LS181 LOGIC DIAGRAM 7 8 2 1 23 22 21 20 19 18 Cn M A0 B0 A1 B1 A2 B2 A3 B3 S0 6 5 S1 S2 4 S3 3 VCC = PIN 24 GND = PIN 12 = PIN NUMBERS F0 9 10 F1 A=B 14 11 F2 13 F3 15 P 16 Cn+4 17 G FUNCTIONAL DESCRIPTION The SN54 / 74LS181 is a 4-bit high speed parallel Arithmetic Logic Unit (ALU). Controlled by the four Function Select Inputs (S0 . . . S3) and the Mode Control Input (M), it can perform all the 16 possible logic operations or 16 different arithmetic operations on active HIGH or active LOW operands. The Function Table lists these operations. When the Mode Control Input (M) is HIGH, all internal carries are inhibited and the device performs logic operations on the individual bits as listed. When the Mode Control Input is LOW, the carries are enabled and the device performs arithmetic operations on the two 4-bit words. The device incorporates full internal carry lookahead and provides for either ripple carry between devices using the Cn+4 output, or for carry lookahead between packages using the signals P (Carry Propagate) and G (Carry Generate), P and G are not affected by carry in. When speed requirements are not stringent, the LS181 can be used in a simple ripple carry mode by connecting the Carry Output (Cn+4) signal to the Carry Input (Cn) of the next unit. For high speed operation the LS181 is used in conjunction with the 9342 or 93S42 carry lookahead circuit. One carry lookahead package is required for each group of the four LS181 devices. Carry lookahead can be provided at various levels and offers high speed capability over extremely long word lengths. The A = B output from the LS181 goes HIGH when all four F outputs are HIGH and can be used to indicate logic equivalence over four bits when the unit is in the subtract mode. The A = B output is open collector and can be wired-AND with other A = B outputs to give a comparison for more then four bits. The A = B signal can also be used with the Cn+4 signal to indicate A>B and A SN54/74LS181 FUNCTION TABLE MODE SELECT INPUTS S3 L L L L L L L L H H H H H H H H S2 L L L L H H H H L L L L H H H H S1 L L H H L L H H L L H H L L H H S0 L H L H L H L H L H L H L H L H ACTIVE LOW INPUTS & OUTPUTS LOGIC (M = H) ARITHMETIC** (M = L) (Cn = L) ACTIVE HIGH INPUTS & OUTPUTS LOGIC (M = H) ARITHMETIC** (M = L) (Cn = H) A A minus 1 AB AB minus 1 A+B AB minus 1 Logical 1 minus 1 A+B A plus (A + B) B AB plus (A + B) AB A minus B minus 1 A+B A+B AB A plus (A + B) AB A plus B B AB plus (A + B) A+B A+B Logical 0 A plus A* AB AB plus A AB AB plus A A A A A A+B A+B AB A+B Logical 0 minus 1 AB A plus AB B (A + B) plus AB AB A minus B minus 1 AB AB minus 1 A+B A plus AB AB A plus B B (A + B) plus AB AB AB minus 1 Logical 1 A plus A* A+B (A + B) plus A A+B (A + B) Plus A A A minus 1 L = LOW Voltage Level H = HIGH Voltage Level **Each bit is shifted to the next more significant position **Arithmetic operations expressed in 2s complement notation LOGIC SYMBOLS ACTIVE LOW OPERANDS 2 1 23 22 21 20 19 18 A0 B0 A1 B1 A2 B2 A3 B3 Cn+4 A=B LS181 G 4 BIT ARITHMETIC LOGIC UNIT P F1 10 F2 11 F3 13 ACTIVE HIGH OPERANDS 2 1 23 22 21 20 19 18 A0 B0 A1 B1 A2 B2 A3 B3 Cn+4 A=B LS181 G 4 BIT ARITHMETIC LOGIC UNIT P F1 10 F2 11 F3 13 7 8 6 5 4 3 Cn M 16 14 17 15 7 8 6 5 4 3 Cn M 16 14 17 15 S0 S1 S2 S3 F0 9 S0 S1 S2 S3 F0 9 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL VOH Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Output Voltage -- High (A = B only) Parameter 54 74 54 74 54, 74 54 74 54, 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 0.4 4.0 8.0 5.5 Unit V C mA mA V FAST AND LS TTL DATA 5-3 SN54/74LS181 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 Output LOW Voltage p g Except G and P VOL Output G Output P IOH Output HIGH Current Input HIGH Current Mode Input Any A or B Input Any S Input Cn Input Mode Input Any A or B Input Any S Input Cn Input Input LOW Current Mode Input Any A or B Input Any S Input Cn Input Short Circuit Current (Note 2) Power Supply Current pp y See Note 1A ICC See Note 1B 74 Note 1. With outputs open, ICC is measured for the following conditions: A. S0 through S3, M, and A inputs are at 4.5 V, all other inputs are grounded. B. S0 through S3 and M are at 4.5 V, all other inputs are grounded. Note 2: Not more than one output should be shorted at a time, nor for more than 1 second. Min 2.0 Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA , , VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA IOL = 16 mA IOL = 8.0 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, MIN VIN = VIL or VIH per Truth Table 0.7 V 0.8 - 0.65 2.5 2.7 3.5 3.5 0.25 0.35 0.4 0.5 0.7 0.6 0.5 100 - 1.5 V V V V V V V A 54, 74 74 54, 74 54 74 54, 74 IIH 20 60 80 100 0.1 0.3 0.4 0.5 - 0.4 - 1.2 - 1.6 - 2.0 - 20 54 74 54 - 100 32 34 A VCC = MAX, VIN = 2.7 V mA VCC = MAX, VIN = 7.0 V IIL mA VCC = MAX, VIN = 0.4 V IOS mA VCC = MAX mA A 35 37 VCC = MAX FAST AND LS TTL DATA 5-4 SN54/74LS181 AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V, Pin 12 = GND, CL = 15 pF) Limits S bl Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL P Parameter Propagation Delay, (Cn to Cn+4) (Cn to F Outputs) (A or B Inputs to G Output) (A or B Inputs to G Output) (A or B Inputs to P Output) (A or B Inputs to P Output) (AX or BX Inputs to FX Output) (AX or BX Inputs to FX Output) (AX or BX Inputs to FXH Outputs) (AX or BX Inputs to FXH Outputs) (A or B Inputs to F Outputs) (A or B Inputs to Cn+4 Output) (A or B Inputs to Cn+4 Output) 22 26 25 25 27 27 33 41 Min Typ 18 13 17 13 19 15 21 21 20 20 20 22 21 13 21 21 Max 27 20 26 20 29 23 32 32 30 30 30 33 32 20 32 32 38 26 38 38 33 38 38 38 41 41 50 62 Ui Unit ns ns ns ns ns ns ns ns ns ns ns ns ns T Test C di i Conditions M = 0 V, (Sum or Diff Mode) See Fig. 4 and Tables I and II M = 0 V, (Sum Mode) See Fig. 4 and Table I M = S1 = S2 = 0 V, S0 = S3 = 4.5 V (Sum Mode) See Fig. 4 and Table I M = S0 = S3 = 0 V, S1 = S2 = 4.5 V (Diff Mode) See Fig. 5 and Table II M = S1 = S2 = 0 V, S0 = S3 = 4.5 V (Sum Mode) See Fig. 4 and Table I M = S0 = S3 = 0 V, S1 = S2 = 4.5 V (Diff Mode) See Fig. 5 and Table II M = S1 = S2 = 0 V, S0 = S3 = 4.5 V (Sum Mode) See Fig. 4 and Table I M = S0 = S3 = 0 V, S1 = S2 = 4.5 V (Diff Mode) See Fig. 5 and Table II M = S1 = S2 = 0 V, S0 = S3 = 4.5 V (Sum Mode) See Fig. 4 and Table I M = S0 = S3 = 0 V, S1 = S2 = 4.5 V (Diff Mode) See Fig. 5 and Table II M = 4.5 V (Logic Mode) See Fig. 4 and Table III M = 0 V, S0 = S3 = 4.5 V, S1 = S2 = 0 V (Sum Mode) See Fig. 6 and Table I M = 0 V, S0 = S3 = 0 V, S1 = S2 = 4.5 V (Diff Mode) M = S0 = S3 = 0 V, S1 = S2 = 4.5 V RL = 2.0 k (Diff Mode) See Fig. 5 and Table II (A or B Inputs to A = B Output) ns AC WAVEFORMS INPUT 1.3 V tPLH 1.3 V tPHL 1.3 V OUTPUT 1.3 V Figure 4 A INPUT B INPUT 1.3 V 1.3 V tPLH OUTPUT 1.3 V 1.3 V INPUT 1.3 V tPHL 1.3 V OUTPUT 1.3 V tPLH 1.3 V 1.3 V tPHL 1.3 V Figure 5 Figure 6 FAST AND LS TTL DATA 5-5 SN54/74LS181 SUM MODE TEST TABLE I Other Input Same Bit Apply 4.5 V Bl Al Bl Al B A None None None None None Apply GND None None None None None None B A B A None FUNCTION INPUTS: S0 = S3 = 4.5 V, S1 = S2 = M = 0 V Other Data Inputs Apply 4.5 V Remaining A and B Remaining A and B Cn Cn None None Remaining B Remaining B Remaining B Remaining B All A Apply GND Cn Cn Remaining A and B Remaining A and B Remaining A and B, Cn Remaining A and B, Cn Remaining A, Cn Remaining A, Cn Remaining A, Cn Remaining A, Cn All B Output Under Test Fl Fl Fl+1 Fl+1 P P G G Cn+4 Cn+4 Any F or Cn+4 Parameter P tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Input Under Test Al Bl Al Bl A B A B A B Cn FAST AND LS TTL DATA 5-6 SN54/74LS181 DIFF MODE TEST TABLE II Other Input Same Bit Apply 4.5 V None A None Al None A B None None A B None None Apply GND B None Bl None B None None A B None None A None FUNCTION INPUTS: S1 = S2 = 4.5 V, S0 = S3 = M = 0 V Other Data Inputs Apply 4.5 V Remaining A Remaining A Remaining B, Cn Remaining B, Cn None None None None Remaining A Remaining A None None All A and B Apply GND Remaining B, Cn Remaining B, Cn Remaining A Remaining A Remaining A and B, Cn Remaining A and B, Cn Remaining A and Bl, Cn Remaining A and B, Cn Remaining B, Cn Remaining B, Cn Remaining A and B, Cn Remaining A and B, Cn None Output Under Test Fl Fl Fl+1 Fl+1 P P G G A=B A=B cn+4 Cn+4 Cn+4 Parameter P tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Input Under Test A B Al Bl A B A B A B A B Cn LOGIC MODE TEST TABLE III Other Input Same Bit Apply 4.5 V None None Apply GND B A Other Data Inputs Apply 4.5 V None None Apply GND Remaining A and B, Cn Remaining A and B, Cn P Parameter tPLH tPHL tPLH tPHL Input Under Test A B Output Under Test Any F Any F F i Inputs Function I S1 = S2 = M = 4.5 V S0 = S3 = 0 V S1 = S2 = M = 4.5 V S0 = S3 = 0 V FAST AND LS TTL DATA 5-7 |
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