54F/74F182 Carry Lookahead Generator General Description Features The ’F182 is a high-speed carry lookahead generator. It is generally used with the ’F181 or ’F381 4-bit arithmetic logic units to provide high-speed lookahead over word lengths of more than four bits. Y Y Y Commercial Provides lookahead carries across a group of four ALUs Multi-level lookahead high-speed arithmetic operation over long word lengths Guaranteed 4000V minimum ESD protection Package Number Military 74F182PC 54F182DM (Note 2) 74F182SJ (Note 1) Package Description N16E 16-Lead (0.300× Wide) Molded Dual-In-Line J16A 16-Lead Ceramic Dual-In-Line M16D 16-Lead (0.300× Wide) Molded Small Outline, EIAJ 54F182FM (Note 2) W16A 16-Lead Cerpack 54F182LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C Note 1: Devices also available in 13× reel. Use suffix e SCX and SJX. Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB Logic Symbols Connection Diagrams Pin Assignment for DIP, SOIC and Flatpak IEEE/IEC Pin Assignment for LCC TL/F/9492 – 1 TL/F/9492 – 2 TL/F/9492–6 TL/F/9492–3 TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9492 RRD-B30M105/Printed in U. S. A. 54F/74F182 Carry Lookahead Generator December 1994 Unit Loading/Fan Out 54F/74F Pin Names Description U.L. HIGH/LOW Input IIH/IIL Output IOH/IOL Cn G0, G2 G1 G3 P0, P1 P2 P3 Cn a xbCn a z G P Carry Input Carry Generate Inputs (Active LOW) Carry Generate Input (Active LOW) Carry Generate Input (Active LOW) Carry Propagate Inputs (Active LOW) Carry Propagate Input (Active LOW) Carry Propagate Input (Active LOW) Carry Outputs Carry Generate Output (Active LOW) Carry Propagate Output (Active LOW) 1.0/2.0 1.0/14.0 1.0/16.0 1.0/8.0 1.0/8.0 1.0/6.0 1.0/4.0 50/33.3 50/33.3 50/33.3 20 mA/b1.2 mA 20 mA/b8.4 mA 20 mA/b9.6 mA 20 mA/b4.8 mA 20 mA/b4.8 mA 20 mA/b3.6 mA 20 mA/b2.4 mA b 1 mA/20 mA b 1 mA/20 mA b 1 mA/20 mA Functional Description The ’F182 carry lookahead generator accepts up to four pairs of Active LOW Carry Propagate (P0 – P3) and Carry Generate (G0 – G3) signals and an Active HIGH Carry input (Cn) and provides anticipated Active HIGH carries (Cn a x, Cn a y, Cn a z) across four groups of binary adders. The ’F182 also has Active LOW Carry Propagate (P) and Carry Generate (G) outputs which may be used for further levels of lookahead. The logic equations provided at the outputs are: Cn a x e G0 a P0Cn Cn a y Cn a z e G1 a P1G0 a P1P0Cn e G2 a P2G1 a P2P1G0 a P2P1P0Cn G P e G3 a P3G2 a P3P2G1 a P3P2P1G0 e P2P2P1P0 Also, the ’F182 can be used with binary ALUs in an active LOW or active HIGH input operand mode. The connections (Figure 1) to and from the ALU to the carry lookahead generator are identical in both cases. Carries are rippled between lookahead blocks. The critical speed path follows the circled numbers. There are several possible arrangements for the carry interconnects, but all achieve about the same speed. A 28-bit ALU is formed by dropping the last ’F181 or ’F381. TL/F/9492 – 5 FIGURE 1. 32-Bit ALU with Rippled Carry between 16-Bit Lookahead ALUs *ALUs may be either ’F181 or ’F381 2 Truth Table Inputs G0 P0 X L X H H H L X H X X L X X L X X H X H H X L X X H X X X L H H H L X X H X X X L L X X X L X X X H X X H H X X L X X X H X X X X L X H H H X L X X X H X X X X L L H H H H L X X X H X X X X L L L X X H H X X L X X X H X X X X L X H H H X L X X X H X X X X L L X X X H X X X L H X X X L G1 P1 Outputs Cn G2 P2 G3 P3 Cn a x Cn a y Cn a z G P L L H H X H X X L L L L H H H X X H X L L L L L H H H H H H H H L X X X H X X X X L L L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial H H H H L L L L X X X H L H H H H L Logic Diagram TL/F/9492 – 4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Storage Temperature b 65§ C to a 150§ C Ambient Temperature under Bias Junction Temperature under Bias Plastic b 55§ C to a 125§ C Free Air Ambient Temperature Military Commercial b 55§ C to a 125§ C 0§ C to a 70§ C Supply Voltage Military Commercial b 55§ C to a 175§ C b 55§ C to a 150§ C a 4.5V to a 5.5V a 4.5V to a 5.5V VCC Pin Potential to Ground Pin 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-STATEÉ Output Current Applied to Output in LOW State (Max) twice the rated IOL (mA) ESD Last Passing Voltage (Min) 4000V 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 54F/74F Parameter Min VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage 54F 10% VCC 74F 10% VCC 74F 5% VCC VOL Output LOW Voltage 54F 10% VCC 74F 10% VCC IIH Input HIGH Current IBVI Typ Units VCC Conditions Max 2.0 V Recognized as a HIGH Signal 0.8 V b 1.2 V Min IIN e b18 mA V Min IOH e b1 mA IOH e b1 mA IOH e b1 mA 0.5 0.5 V Min IOL e 20 mA IOL e 20 mA 54F 74F 20.0 5.0 mA Max VIN e 2.7V Input HIGH Current Breakdown Test 54F 74F 100 7.0 mA Max VIN e 7.0V ICEX Output HIGH Leakage Current 54F 74F 250 50 mA Max VOUT e VCC VID Input Leakage Test 74F V 0.0 IID e 1.9 mA All Other Pins Grounded IOD Output Leakage Circuit Current 74F mA 0.0 VIOD e 150 mV All Other Pins Grounded IIL Input LOW Current Max VIN VIN VIN VIN VIN VIN 2.5 2.5 2.7 4.75 3.75 b 1.2 b 2.4 b 3.6 b 4.8 b 8.4 b 9.6 b 60 mA Recognized as a LOW Signal e e e e e e 0.5V (Cn) 0.5V (P3) 0.5V (P2) 0.5V (G3, P0, P1) 0.5V (G0, G2) 0.5V (G1) IOS Output Short-Circuit Current b 150 mA Max VOUT e 0V ICCH Power Supply Current 18.4 28.0 mA Max VO e HIGH ICCL Power Supply Current 23.5 36.0 mA Max VO e LOW 4 AC Electrical Characteristics Symbol Parameter 74F 54F 74F TA e a 25§ C VCC e a 5.0V CL e 50 pF TA, VCC e Mil CL e 50 pF TA, VCC e Com CL e 50 pF Units Min Typ Max Min Max Min Max tPLH tPHL Propagation Delay Cn to Cn a x, Cn a y, Cn a z 3.0 3.0 6.6 6.8 8.5 9.0 3.0 3.0 12.0 11.0 3.0 3.0 9.5 10.0 ns tPLH tPHL Propagation Delay P0, P1, or P2 to Cn a x, Cn a y, or Cn a z 2.5 1.5 6.2 3.7 8.0 5.0 2.5 1.0 11.0 7.0 2.5 1.5 9.0 6.0 ns tPLH tPHL Propagation Delay G0, G1, or G2 to Cn a x, Cn a y, or Cn a z 2.5 1.5 6.5 3.9 8.5 5.2 2.5 1.0 11.0 7.0 2.5 1.5 9.5 6.0 ns tPLH tPHL Propagation Delay P1, P2, or P3 to G 3.0 3.0 7.9 6.0 10.0 8.0 3.0 2.5 12.0 10.0 3.0 3.0 11.0 9.0 ns tPLH tPHL Propagation Delay Gn to G 3.0 3.0 8.3 5.7 10.5 7.5 3.0 2.5 12.0 10.0 3.0 3.0 11.5 8.5 ns tPLH tPHL Propagation Delay Pn to P 3.0 2.5 5.7 4.1 7.5 5.5 2.5 2.5 10.0 8.0 3.0 2.5 8.5 6.5 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 182 P Temperature Range Family 74F e Commercial 54F e Military C QB Special Variations QB e Military grade with environmental and burn-in processing shipped in tubes Device Type Temperature Range C e Commercial (0§ C to a 70§ C) M e Military (b55§ C to a 125§ C) Package Code P e Plastic DIP D e Ceramic DIP F e Flatpak L e Leadless Chip Carrier (LCC) SJ e Small Outline SOIC EIAJ 5 Physical Dimensions inches (millimeters) 20-Lead Ceramic Leadless Chip Carrier (L) NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 6 Physical Dimensions inches (millimeters) (Continued) 16-Lead (0.300× Wide) Molded Small Outline Package, EIAJ (SJ) NS Package Number M16D 16-Lead (0.300× Wide) Molded Dual-In-Line Package (P) NS Package Number N16E 7 54F/74F182 Carry Lookahead Generator Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flatpak (F) NS Package Number W16A 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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