Philips Semiconductors Product specification Look-ahead carry generator 74F182 FEATURES PIN CONFIGURATION • Provides carry look-ahead across a group of four ALUs • Multi-level look-ahead for high speed arithmetic operation over G1 1 16 VCC P1 2 15 P2 G0 3 14 G2 P0 4 13 Cn G3 5 12 Cn+x P3 6 11 Cn+y P 7 10 G GND 8 9 Cn+z long word lengths DESCRIPTION The 74F182 is a high speed carry look-ahead generator. It accepts up to four pairs of active-Low Carry Propagate (P0, P1, P2, P3) and Carry Generate (G0, G1, G2, G3) signals and an active-High Carry input (Cn) and provides anticipated active-High carries (Cn+x, Cn+y, Cn+z) across four groups of binary adders. The 74F182 also has active-Low Carry Propagate (P) Carry Generate (G) outputs which may be used for further levels of look-ahead. SF00725 The logic equations provided at the outputs are: Cn+x = G0+P0Cn Cn+y = G1+P1G0+P1P0Cn Cn+z = G2+P2G1+P2P1G0+P2P1P0Cn G = G3+P3G2+P3P2G1+P3P2P1G0 P = P3P2P1P0 The 74F182 can also be used with binary ALUs in an active-Low or active-High input operand mode. The connections to and from the ALU to the carry look-ahead generator are identical in both cases. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F182 5.0ns 21mA ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C 16-pin plastic DIP N74F182N 16-pin plastic SO N74F182D INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS 74FAST (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW Carry input 2.5/2.0 50µA/1.2mA G0, G2 Carry generate inputs (active-Low) 2.5/14.0 50µA/8.4mA G1 Carry generate input (active-Low) 2.5/16.0 50µA/9.6mA G3 Cn DESCRIPTION Carry generate input (active-Low) 2.5/8.0 50µA/4.8mA P0, P1 Carry propagate inputs (active-Low) 2.5/8.0 50µA/4.8mA P2 Carry propagate input (active-Low) 2.5/6.0 50µA/3.6mA P3 Carry propagate input (active-Low) 2.5/4.0 50µA/2.4mA Carry outputs 50/33 1.0mA/20mA G Carry generate output (active-Low) 50/33 1.0mA/20mA P Carry propagate output (active-Low) 50/33 1.0mA/20mA Cn+x–Cn+z NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state. 1991 Apr 15 2 853–1161 02162 Philips Semiconductors Product specification Look-ahead carry generator 74F182 LOGIC SYMBOL IEC/IEEE SYMBOL 4 3 2 1 15 14 6 5 CPG 13 CI 4 CP0 C00 3 P0 G0 13 P1 G1 P2 G2 P3 G3 Cn Cn+x Cn+y G 10 2 P 7 1 CP1 9 CP2 CG2 6 11 11 C02 14 12 C01 CG1 15 Cn+z 12 CG0 CP3 CP CG 7 10 5 9 CG3 VCC = Pin 16 GND = Pin 8 SF00726 SF00727 LOGIC DIAGRAM G0 3 P0 4 Cn 12 Cn+x 13 G1 1 P1 2 11 G2 14 P2 15 9 G3 5 P3 6 Cn+y Cn+z 10 G 7 P VCC = Pin 16 GND = Pin 8 SF00724 1991 Apr 15 3 Philips Semiconductors Product specification Look-ahead carry generator 74F182 FUNCTION TABLE INPUTS G1 P1 OUTPUTS Cn G0 P0 X H H G2 P2 G3 P3 Cn+x L L H X L X L X H H X L H Cn+y X X X H H L X H H H X L L H X H X L X X X L X H Cn+z X L X X L H H X L X L H X X X X X H H L X X X H H H X L X H H H X H X L L H X H X H X L X X X X X L X H X X X L X X L H X L X X L X L H H X L X L X L X X X X X H H X X H H H X H X H H H X H X H H H X H X H X H X X X X X L X L X X X L X X L L X L X X L X L L L X L X L L X P H H X L H X X X H X H X X H X X H X H X X X H H L L L L L NOTES: H = High voltage level L = Low voltage level X = Don’t care 1991 Apr 15 G 4 Philips Semiconductors Product specification Look-ahead carry generator 74F182 APPLICATION Cn Cn ALU* G P ALU* G P A, B C18 Cn Cn+4 ALU* G P Cn+4 ALU* G P Cn Cn ALU* G P Cn Cn ALU* G P Cn+4 Cn ALU* Cn+4 COUT (C32) ALU* F P0 G0 P1 G1 P2 G2 P3 G3 P0 G0 P1 G1 P2 G2 P3 G3 G CIN 74F182 Cn Cn+x Cn+y G 74F182 Cn P Cn+z Cn+x Cn+y P Cn+z SF00728 Figure 1. 32-Bit ALU with Ripple Carry Between 16-Bit Look-Ahead ALUs (*ALUs may be either 74F181 or 74F381) ABSOLUTE MAXIMUM RATINGS (Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.) RATING UNIT VCC Supply voltage PARAMETER –0.5 to +7.0 V VIN Input voltage –0.5 to +7.0 V IIN Input current –30 to +5 mA VOUT Voltage applied to output in High output state –0.5 to VCC V IOUT Current applied to output in Low output state 40 mA Tamb Operating free-air temperature range 0 to +70 °C Tstg Storage temperature range –65 to +150 °C SYMBOL RECOMMENDED OPERATING CONDITIONS LIMITS SYMBOL PARAMETER MIN NOM MAX 5.0 5.5 UNIT VCC Supply voltage 4.5 VIH High-level input voltage 2.0 VIL Low-level input voltage 0.8 V IIK Input clamp current –18 mA IOH High-level output current –1 mA IOL Low-level output current 20 mA Tamb Operating free-air temperature range 70 °C 1991 Apr 15 0 5 V V Philips Semiconductors Product specification Look-ahead carry generator 74F182 DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL VCC = MIN, VIL = MAX, VIH = MIN IOH = MAX Low-level output voltage VCC = MIN, VIL = MAX, VIH = MIN IOL = MAX VIK Input clamp voltage VCC = MIN, II = IIK II Input current at maximum input voltage IIH High-level input current VOH High-level output voltage VOL IIL IOS ICC Low-level input current Short-circuit output MIN ±10%VCC 2.5 ±5%VCC 2.7 ±10%VCC TYP2 MAX UNIT V 3.4 V 0.30 0.50 V 0.30 0.50 V –0.73 –1.2 V VCC = MAX, VI = 7.0V 250 µA VCC = MAX, VI = 2.7V 250 µA Cn –1.2 mA G0, G2 –8.4 mA G1 –9.6 mA G3, P0, P1 ±5%VCC VCC = MAX, VI = 0.5V –4.8 mA P2 –3.6 mA P3 –2.4 mA current3 Supply current (total) LIMITS TEST CONDITIONS1 PARAMETER VCC = MAX ICCH ICCL –60 VCC = MAX –150 mA 18 28 mA 24 36 mA NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. 2. All typical values are at VCC = 5V, Tamb = 25°C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last. AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL PARAMETER TEST CONDITION VCC = +5.0V Tamb = +25°C CL = 50pF RL = 500Ω VCC = +5.0V ± 10% Tamb = 0°C to +70°C CL = 50pF RL = 500Ω MIN TYP MAX MIN MAX UNIT tPLH tPHL Propagation delay Cn to Cn+x, Cn+y, Cn+z Waveform 2 2.5 2.5 5.0 5.0 8.0 7.5 2.5 2.5 8.5 8.5 ns tPLH tPHL Propagation delay P0, P1, or P2 to Cn+x, Cn+y, Cn+z Waveform 1 2.0 1.5 5.0 3.5 7.0 5.0 1.5 1.5 8.0 6.0 ns tPLH tPHL Propagation delay G0, G1, or G2 to Cn+x, Cn+y, Cn+z Waveform 1 1.5 1.5 4.0 3.0 7.5 5.0 1.5 1.5 8.5 5.5 ns tPLH tPHL Propagation delay P1, P2, or P3 to G Waveform 2 2.0 3.0 7.0 5.0 10.0 7.0 1.5 2.5 11.0 8.0 ns tPLH tPHL Propagation delay Gn to G Waveform 2 1.5 3.0 5.0 5.0 7.0 7.0 1.5 2.5 7.5 8.0 ns tPLH tPHL Propagation delay Pn to P Waveform 2 1.5 2.5 3.5 4.0 6.0 6.0 1.5 2.5 7.5 6.5 ns 1991 Apr 15 6 Philips Semiconductors Product specification Look-ahead carry generator 74F182 AC WAVEFORMS For all waveforms, VM = 1.5V VIN VM tPHL VOUT VIN VM VM tPLH VM VM tPLH VM tPHL VM VOUT VM SF00093 Waveform 1. Propagation Delay for Inverting Outputs SF00092 Waveform 2. Propagation Delay for Non-Inverting Outputs TEST CIRCUIT AND WAVEFORMS VCC VIN tw 90% NEGATIVE PULSE 10% D.U.T. RT CL RL AMP (V) VM VM VOUT PULSE GENERATOR 90% 10% tTHL (tf ) tTLH (tr ) tTLH (tr ) tTHL (tf ) 0V AMP (V) 90% 90% POSITIVE PULSE DEFINITIONS: RL = Load resistor; see AC ELECTRICAL CHARACTERISTICS for value. CL = Load capacitance includes jig and probe capacitance; see AC ELECTRICAL CHARACTERISTICS for value. RT = Termination resistance should be equal to ZOUT of pulse generators. VM VM 10% Test Circuit for Totem-Pole Outputs 10% tw 0V Input Pulse Definition INPUT PULSE REQUIREMENTS family amplitude VM 74F 3.0V 1.5V rep. rate tw tTLH tTHL 1MHz 500ns 2.5ns 2.5ns SF00006 1991 Apr 15 7