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Philips Semiconductors
Product specification
Look-ahead carry generator
74F182
FEATURES
* Provides carry look-ahead across a group of four ALUs * Multi-level look-ahead for high speed arithmetic operation over
long word lengths
PIN CONFIGURATION
G1 P1 G0 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC P2 G2 Cn Cn+x Cn+y G Cn+z
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. 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.
P0 G3 P3 P GND
SF00725
TYPE 74F182
TYPICAL PROPAGATION DELAY 5.0ns
TYPICAL SUPPLY CURRENT (TOTAL) 21mA
ORDERING INFORMATION
ORDER CODE DESCRIPTION 16-pin plastic DIP 16-pin plastic SO COMMERCIAL RANGE VCC = 5V 10%, Tamb = 0C to +70C N74F182N N74F182D
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS Cn G0, G2 G1 G3 P0, P1 P2 P3 Cn+x-Cn+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) DESCRIPTION 74FAST (U.L.) HIGH/LOW 2.5/2.0 2.5/14.0 2.5/16.0 2.5/8.0 2.5/8.0 2.5/6.0 2.5/4.0 50/33 50/33 50/33 LOAD VALUE HIGH/LOW 50A/1.2mA 50A/8.4mA 50A/9.6mA 50A/4.8mA 50A/4.8mA 50A/3.6mA 50A/2.4mA 1.0mA/20mA 1.0mA/20mA 1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20A 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
4 3 2 1 15 14 6 5
IEC/IEEE SYMBOL
CPG CI CP0 C00 CG0 CP1 CG1 C02 CP2 CG2 CP3 CG3 CP CG 7 10 C01 11 9 12
13 4 3
P0 G0 13 Cn
P1
G1
P2 G2
P3 G3 G P 10 7
2 1 15 14 6
Cn+x
Cn+y
Cn+z
12 VCC = Pin 16 GND = Pin 8
11
9
5
SF00726
SF00727
LOGIC DIAGRAM
G0 P0 Cn 3 4 13 12 Cn+x
G1 P1
1 2 11 Cn+y
G2 P2
14 15
9
Cn+z
G3 P3
5 6
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 Cn X L X H X X L X X H X X X L X X X H G0 H H L X X H H X L X X X H H X X L X X X X H X X X L H X X X L NOTES: H = High voltage level L = Low voltage level X = Don't care P0 H X X L X H X X X L X X H X X X X L H H H L X X X H H H X L X X X X H H X X L X H X X X L L X H X X X X L L X X H X X X X L X H X X L H H H H L X X X X H H H X L X X H X X X X L L L X H X X X X L L X X H X L H H H H L X X X H X X X X L L L X X X H L G1 P1 G2 P2 G3 P3 Cn+x L L H H L L L H H H L L L L H H H H H H H H L L L L H H H H L Cn+y OUTPUTS Cn+z G P
1991 Apr 15
4
Philips Semiconductors
Product specification
Look-ahead carry generator
74F182
APPLICATION
Cn ALU* G P A, B C18 Cn Cn+4 ALU* G P Cn ALU* G P Cn Cn+4 ALU* G P
Cn ALU* G P
Cn ALU* G P
Cn
Cn+4 ALU*
Cn
Cn+4 ALU*
COUT (C32)
F P0 G0 P1 G1 P2 G2 P3 G3 G CIN Cn 74F182 P Cn+z Cn 74F182 P0 G0 P1 G1 P2 G2 P3 G3 G P Cn+z
Cn+x
Cn+y
Cn+x
Cn+y
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.) SYMBOL VCC VIN IIN VOUT IOUT Tamb Tstg Supply voltage Input voltage Input current Voltage applied to output in High output state Current applied to output in Low output state Operating free-air temperature range Storage temperature range PARAMETER RATING -0.5 to +7.0 -0.5 to +7.0 -30 to +5 -0.5 to VCC 40 0 to +70 -65 to +150 UNIT V V mA V mA C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL IIK IOH IOL Tamb Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature range 0 PARAMETER MIN 4.5 2.0 0.8 -18 -1 20 70 NOM 5.0 MAX 5.5 UNIT V V V mA mA mA C
1991 Apr 15
5
Philips Semiconductors
Product specification
Look-ahead carry generator
74F182
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 VCC = MIN, VIL = MAX, VIH = MIN VCC = MIN, VIL = MAX, VIH = MIN VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V Cn G0, G2 G1 IIL Low-level input current G3, P0, P1 P2 P3 IOS ICC Short-circuit output current3 ICCH ICCL VCC = MAX VCC = MAX -60 18 24 VCC = MAX, VI = 0.5V LIMITS MIN TYP2 MAX UNIT V 3.4 0.30 0.30 -0.73 0.50 0.50 -1.2 250 250 -1.2 -8.4 -9.6 -4.8 -3.6 -2.4 -150 28 36 V V V V A A mA mA mA mA mA mA mA mA mA
VOH
High-level output voltage
IOH = MAX
10%VCC 5%VCC 10%VCC 5%VCC
2.5 2.7
VOL VIK II IIH
Low-level output voltage Input clamp voltage Input current at maximum input voltage High-level input current
IOL = MAX
Supply current (total)
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 = 25C. 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 TEST CONDITION VCC = +5.0V Tamb = +25C CL = 50pF RL = 500 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Propagation delay Cn to Cn+x, Cn+y, Cn+z Propagation delay P0, P1, or P2 to Cn+x, Cn+y, Cn+z Propagation delay G0, G1, or G2 to Cn+x, Cn+y, Cn+z Propagation delay P1, P2, or P3 to G Propagation delay Gn to G Propagation delay Pn to P Waveform 2 Waveform 1 Waveform 1 Waveform 2 Waveform 2 Waveform 2 2.5 2.5 2.0 1.5 1.5 1.5 2.0 3.0 1.5 3.0 1.5 2.5 TYP 5.0 5.0 5.0 3.5 4.0 3.0 7.0 5.0 5.0 5.0 3.5 4.0 MAX 8.0 7.5 7.0 5.0 7.5 5.0 10.0 7.0 7.0 7.0 6.0 6.0 VCC = +5.0V 10% Tamb = 0C to +70C CL = 50pF RL = 500 MIN 2.5 2.5 1.5 1.5 1.5 1.5 1.5 2.5 1.5 2.5 1.5 2.5 MAX 8.5 8.5 8.0 6.0 8.5 5.5 11.0 8.0 7.5 8.0 7.5 6.5 ns ns ns ns ns ns
SYMBOL
PARAMETER
UNIT
1991 Apr 15
6
Philips Semiconductors
Product specification
Look-ahead carry generator
74F182
AC WAVEFORMS
For all waveforms, VM = 1.5V
VIN
VM tPHL
VM tPLH
VIN
VM tPLH
VM tPHL
VOUT
VM
VM VOUT
VM
VM
SF00093
Waveform 1. Propagation Delay for Inverting Outputs
SF00092
Waveform 2.
Propagation Delay for Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
VCC NEGATIVE PULSE VIN PULSE GENERATOR RT D.U.T. VOUT 90% VM 10% tTHL (tf ) CL RL tw VM 10% tTLH (tr ) 0V 90% AMP (V)
tTLH (tr ) 90% POSITIVE PULSE VM 10% tw
tTHL (tf ) AMP (V) 90% VM 10% 0V
Test Circuit for Totem-Pole Outputs 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.
Input Pulse Definition INPUT PULSE REQUIREMENTS family amplitude VM 74F 3.0V 1.5V rep. rate 1MHz tw 500ns tTLH 2.5ns tTHL 2.5ns
SF00006
1991 Apr 15
7

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