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| For:char Printed on:Mon, Feb 6, 1995 09:49:57 From book:DL121CH4 (5) VIEW Document:MC74F382 (5) VIEW Last saved on:Fri, Feb 3, 1995 16:07:09 MC54/74F382 4-BIT ARITHMETIC LOGIC UNIT The MC54/74F382 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. An Overflow output is provided for convenience in twos complement arithmetic. A Carry output is provided for ripple expansion. For high-speed expansion using a Carry Lookahead Generator, refer to the F381 data sheet. 4-BIT ARITHMETIC LOGIC UNIT FASTTM SCHOTTKY TTL * * * * * Performs Six Arithmetic and Logic Functions Selectable Low (Clear) and High (Preset) Functions LOW Input Loading Minimizes Drive Requirements Carry Output for Ripple Expansion Overflow Output for Twos Complement Arithmetic CONNECTION DIAGRAM VCC A2 20 19 B2 18 A3 17 B3 16 Cn Cn+4 OVR F3 15 14 13 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 34 1 2 19 18 17 16 DW SUFFIX SOIC CASE 751D-03 1 A0 B0 A1 B1 A2 B2 A3 B3 15 7 6 5 Cn S2 S1 S0 Cn+4 OVR F0 8 F1 9 F2 11 F3 12 14 13 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 4-184 MC54/74F382 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 4-185 MC54/74F382 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 IIL Other Inputs Cn Input IOS ICC Output Short Circuit Current (Note 2) Power Supply Current - 60 54 - 0.6 - 2.4 - 3.0 -150 81 2.7 3.4 0.35 0.5 20 V V A A mA mA mA mA mA VOUT = 0 V S0, Cn = HIGH; Other Inputs GND VCC = MAX VCC = MAX VIN = 0.5 V VCC = MAX 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 VCC = MIN VCC = 4.5 V VCC = 4.75 V VCC = MIN 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. Ripple expansion is illustrated in Figure 1. The overflow output OVR is the Exclusive-OR of Cn + 3 and Cn+4; a HIGH signal on OVR indicates overflow in twos complement operation. 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 L = LOW Voltage Level H = HIGH Voltage Level FAST AND LS TTL DATA 4-186 MC54/74F382 A0-A3 4 Cin 3 B0-B3 4 A4-A7 4 B4-B7 4 A8-A11 B8-B11 4 4 A12-A15 B12-B15 4 4 Cout OVERFLOW A B Cn Cn+4 F382 S 3 3 A B Cn Cn+4 F382 S 3 A B Cn Cn+4 F382 S 3 A B Cn Cn+4 F382 S OVR SELECT F0-F3 F4-F7 F8-F11 F12-F15 Figure 1. 16-Bit Ripple Carry ALU Expansion Path Segment Ai or Bi to Cn + 4 Cn to Cn + 4 Cn to Cn + 4 Cn to F Cn to Cn + 4, OVR Total Delay Toward F 6.5 ns 6.3 ns 6.3 ns 8.1 -- 27.2 ns Output Cn + 4, OVR 6.5 ns 6.3 ns 6.3 ns -- 8.0 ns 27.1 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 tPLH tPHL tPLH tPHL Parameter Propagation Delay Cn to Fi Propagation Delay Any A or B to Any F Propagation Delay Si to Fi Propagation Delay Ai or Bi to Cn + 4 Propagation Delay Si to OVR or Cn + 4 Propagation Delay Cn to Cn + 4 Propagation Delay Cn to OVR Propagation Delay Ai or Bi to OVR Min 3.0 2.5 4.0 3.5 6.0 4.0 3.5 3.0 7.0 4.5 2.5 2.5 3.5 3.5 6.5 5.5 Typ 8.1 5.7 10.4 8.2 11 8.2 6.0 6.5 12.5 9.0 5.6 6.3 8.0 7.1 11.5 8.0 Max 12 8.0 15 11 15 20.5 8.5 9.0 16.5 12 8.0 9.0 11 10 15.5 10.5 54F TA = -55 to +125C VCC = 5.0 V 10% CL = 50 pF Min 3.0 2.5 4.0 3.5 6.0 4.0 3.5 3.0 7.0 4.5 2.5 2.5 3.5 3.5 6.5 5.5 Max 15 11 18 14 21 23.5 11.5 12.5 19.5 15 11 12 14 13 18.5 13.5 74F TA = 0 to 70C VCC = 5.0 V 10% CL = 50 pF Min 3.0 2.5 4.0 3.5 6.0 4.0 3.5 3.0 7.0 4.5 2.5 2.5 3.5 3.5 6.5 5.5 Max 13 9.0 16 12 16 21.5 9.5 10.5 17.5 13 9.0 10 12 11 16.5 11.5 Unit ns ns ns ns ns ns ns ns FAST AND LS TTL DATA 4-187 MC54/74F382 TRUTH TABLE INPUTS Function CLEAR S0 0 S1 0 S2 0 Cn 0 1 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 0 X 1 X X X 0 1 X X X 0 1 X X X 0 1 An X 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 1 0 0 1 1 1 0 0 1 1 1 0 0 1 1 1 Bn X 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 0 1 0 1 1 0 1 0 1 1 0 1 0 1 1 F0 0 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 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 F1 0 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 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 F2 0 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 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 OUTPUTS F3 0 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 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 OVR 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0 1 0 1 0 0 0 0 1 Cn + 4 1 1 0 1 0 0 1 1 0 1 0 0 1 0 1 0 1 1 0 0 0 1 0 1 1 1 0 0 0 1 1 0 0 0 0 1 1 0 1 0 1 0 0 0 0 1 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 4-188 |
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