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| For:char Printed on:Mon, Feb 6, 1995 09:49:45 From book:DL121CH4 (5) VIEW Document:MC74F381 (5) VIEW Last saved on:Fri, Feb 3, 1995 16:06:52 MC54/74F381 4-BIT ARITHMETIC LOGIC UNIT The MC54/74F381 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. 4-BIT ARITHMETIC LOGIC UNIT FASTTM SCHOTTKY TTL * * * * 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 CONNECTION DIAGRAM VCC A2 20 19 B2 18 A3 17 B3 16 Cn 15 P 14 G 13 F3 12 F2 11 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 1 A1 2 B1 3 A0 4 B0 5 S0 6 S1 7 S2 8 F0 9 F1 10 GND 20 LOGIC SYMBOL 3 4 1 2 19 18 17 16 A0 B0 A1 B1 A2 B2 A3 B3 15 7 6 5 Cn S2 S1 S0 G P F0 8 F1 9 F2 11 F3 12 13 14 VCC = PIN 20 GND = PIN 10 DW SUFFIX SOIC CASE 751D-03 1 ORDERING INFORMATION MC54FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range 74 Output Current -- High Output Current -- Low 54, 74 54, 74 0 25 70 - 1.0 20 Parameter 54, 74 54 Min 4.5 - 55 Typ 5.0 25 Max 5.5 125 Unit V C mA mA FAST AND LS TTL DATA 4-179 MC54/74F381 LOGIC DIAGRAM Cn B0 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. F0 A0 B1 F1 A1 B2 F2 A2 B3 F3 A3 P F381 ONLY S0 G OVR S1 Cn+4 F382 ONLY S2 FAST AND LS TTL DATA 4-180 MC54/74F381 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH VOL IIH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage 54, 74 Output HIGH Voltage 74 Output LOW Voltage Input HIGH Current 100 Input LOW Current S0-S2 Inputs Other Inputs IOS ICC Output Short Circuit Current (Note 2) Power Supply Current -60 59 - 0.6 - 2.4 -150 89 2.7 3.4 0.35 0.5 20 V V A A mA mA mA mA 2.5 3.4 Min 2.0 0.8 -1.2 Typ Max Unit V V V V Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = -1.0 mA IOH = -1.0 mA IOL = 20 mA VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VIN = 0.5 V VOUT = 0 V S0-S2 = GND; Other Inputs HIGH VCC = MAX VCC = MAX VCC = MIN VCC = 4.5 V VCC = 4.75 V VCC = MIN VCC = MAX IIL VCC = MAX NOTES: 1. For conditions such as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second. 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 Select S0 L H L H L H L H S1 L L H H L L H H S2 L L L L H H H H Operation Clear B Minus A A Minus B A Plus B AB A+B AB Preset H = HIGH Voltage Level L = LOW Voltage Level FAST AND LS TTL DATA 4-181 MC54/74F381 A0-A3 4 CIN 3 SELECT 3 F0-F3 G0 P0 Cn Cn+z F4-F7 G1 P1 Cn+y F8-F11 G2 P2 Cn+z F12-F15 A B Cn F381 S FGP 3 B0-B3 4 A4-A7 4 A B Cn F381 S FGP 3 B4-B7 4 A8-A11 B8-B11 4 A B Cn F381 S FGP 3 4 A12-A15 B12-B15 4 4 COUT OVERFLOW A B Cn Cn+4 F382 S OVR F F182 CLA Figure 1. 16-Bit Lookahead Carry ALU Expansion Path Segment Ai or Bi to P Pi to Cn + j ('F182) Cn to F Cn to Cn + 4 , OVR Total Delay Toward F 7.2 ns 6.2 ns 8.1 ns -- 21.5 ns Output Cn + 4, OVR 7.2 ns 6.2 ns -- 8.0 ns 21.4 ns Figure 2. 16-Bit Delay Tabulation AC CHARACTERISTICS 54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay Cn to Fi Propagation Delay Any A or B to Any F Propagation Si to Fi Propagation Delay Ai or Bi to G Propagation Delay Ai or Bi to P Propagation Delay Si to G or P Min 2.5 2.5 4.0 3.5 4.5 4.0 3.0 4.0 2.5 3.5 4.0 4.5 Typ 8.1 5.7 10.4 8.2 8.3 8.2 6.4 6.8 7.2 6.5 7.8 10.2 Max 12 8.0 15 11 20 13 9.0 10 10.5 9.5 12 13.5 54F TA = - 55 to +125C VCC = 5.0 V 10% CL = 50 pF Min 2.5 2.5 4.0 3.5 4.5 4.0 3.0 4.0 2.5 3.5 4.0 4.5 Max 15 11 18 14 23.5 16 12 13 13.5 12.5 15 16.5 74F TA = 0 to +70C VCC = 5.0 V 10% CL = 50 pF Min 2.5 2.5 4.0 3.5 4.5 4.0 3.0 4.0 2.5 3.5 4.0 4.5 Max 13 9.0 16 12 21.5 14 10 11 11.5 10.5 13 14.5 Unit ns ns ns ns ns ns FAST AND LS TTL DATA 4-182 MC54/74F381 TRUTH TABLE INPUTS FUNCTION CLEAR S0 0 S1 0 S2 0 Cn X 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 X X X X X X X X X X X X X X X X An X 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bn X 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 F0 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1 F1 0 1 1 0 1 0 1 0 0 1 0 1 1 0 0 1 0 0 1 1 1 0 0 0 1 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1 OUTPUTS F2 0 1 1 0 1 0 1 0 0 1 0 1 1 0 0 1 0 0 1 1 1 0 0 0 1 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1 F3 0 1 1 0 1 0 1 0 0 1 0 1 1 0 0 1 0 0 1 1 1 0 0 0 1 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1 G 0 1 0 1 1 1 0 1 1 1 1 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 1 1 0 0 1 1 1 0 1 0 1 1 1 1 1 P 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 1 1 0 B MINUS A 1 0 0 A MINUS B 0 1 0 A PLUS B 1 1 0 AB 0 0 1 A+B 1 0 1 AB 0 1 1 PRESET 1 1 1 1 = HIGH Voltage Level 0 = LOW Voltage Level X = Immaterial FAST AND LS TTL DATA 4-183 |
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