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MC54/74F182 CARRY LOOKAHEAD GENERATOR
The MC54/74F182 is a high-speed carry lookahead generator. It is generally used with the F181, F381 or 29F01 4-bit arithmetic logic unit to provide highspeed lookahead over word lengths of more than four bits. * Provides Lookahead Carries Across a Group of Four ALUs * Multi-level Lookahead High-speed Arithmetic Operation Over Long Word Lengths CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 P2 15 G2 14 Cn 13 Cn + x Cn + y 12 11 G 10 Cn + z 9
16 1
CARRY LOOKAHEAD GENERATOR
FASTTM SCHOTTKY TTL
J SUFFIX CERAMIC CASE 620-09
1 G1
2 P1
3 G0
4 P0
5 G3
6 P3
7 P
8 GND
16 1
N SUFFIX PLASTIC CASE 648-08
16 1
D SUFFIX SOIC CASE 751B-03
LOGIC DIAGRAM
ORDERING INFORMATION
MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC
Cn G0 P0
G1 P1
G2 P2
G3 P3
LOGIC SYMBOL
13 Cn P0 G0 12 Cn + x Cn + y Cn + z G P 11 9 Cn + x Cn + y Cn + z P1 G1 P2 G2 P3 G3 G 10 4 3 2 1 15 14 6 5 VCC = PIN 16 GND = PIN 8
P 7
FAST AND LS TTL DATA 4-97
MC54/74F182
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
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
Outputs G2 P2 G3 P3 Cn+x L L H H Cn+y Cn+z G P
P0 H X X L X H X X X L X X H X X X X L
G1
P1
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
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
GUARANTEED OPERATING RANGES
Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54,74 54 74 IOH IOL Output Current -- High Output Current -- Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C
FAST AND LS TTL DATA 4-98
MC54/74F182
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 Output HIGH Voltage 54, 74 74 Output LOW Voltage Input HIGH Current 2.5 2.7 3.4 3.4 0.35 0.5 20 100 Cn Input P3 Input IIL Input LOW Current P2 Input G3, P0, P1 Inputs G0, G2 Inputs G1 Input IOS ICCH ICCL Output Short Circuit Current (Note 2) Power Supply Current (All Outputs HIGH) Power Supply Current (All Outputs LOW) -60 18.4 23.5 -1.2 -2.4 -3.6 -4.8 -8.4 -9.6 -150 28 36 mA mA mA VOUT = 0 V P3, G3 = 4.5 V All Other Inputs = GND G0, G1, G2 = 4.5 V All Other Inputs = GND VCC = MAX VCC = MAX VCC = MAX mA VIN = 0.5 V VCC = MAX Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A A 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 = 4.50 V VCC = 4.75 V VCC = MIN VCC = MAX VCC = MAX
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. No more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter 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 Min 3.0 3.0 2.5 1.5 2.5 1.5 Typ 6.6 6.8 6.2 3.7 6.5 3.9 Max 8.5 9.0 8.0 5.0 8.5 5.2 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 3.0 3.0 2.5 1.5 2.5 1.5 Max 10.5 11 10.7 6.5 10.5 6.5 74F TA = 0C to +70C VCC = 5.0V 10% CL = 50 pF Min 3.0 3.0 2.5 1.5 2.5 1.5 Max 9.5 ns 10 9.0 6.0 9.5 6.0 ns ns Unit
FAST AND LS TTL DATA 4-99
MC54/74F182
AC CHARACTERISTICS (Continued)
54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay P1, P2, or P3 to G Propagation Delay Gn to G Propagation Delay Pn to P Min 2.0 2.0 2.0 1.5 2.5 2.5 Typ 7.9 6.0 8.3 5.7 5.7 4.1 Max 10 8.0 10.5 7.5 7.5 5.5 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 2.0 2.0 2.0 1.5 2.5 2.5 Max 12.5 9.5 12.5 9.5 11 7.5 74F TA = 0C to +70C VCC = 5.0V 10% CL = 50 pF Min 2.0 2.0 2.0 1.5 2.5 2.5 Max 11 ns 9.0 11.5 ns 8.5 8.5 ns 6.5 Unit
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 + x, Cn + y, Cn + 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 output are: Cn + x = G0 + P0Cn Cn + y = G1 + P1G0 + P1P0Cn Cn + z = G2 + P2G1 + P2P1G0 + P2P1P0Cn G = G3 + P3G2 + P3P2G1 + P3P2P1G0 P = P3P2P1P0 Also, the F182 can be used with binary ALUs in an activeLOW 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.
Cn A, B
1
ALU** G P C16 Cn Cn + 4 ALU** G P
Cn
ALU** G P
5
Cn Cn + 4 ALU** G P
2
Cn
ALU** G P
Cn
ALU** G P
Cn Cn + 4 ALU**
Cn Cn + 4 ALU** F
6
COUT (C32)
CIN
P0 G0 P1 G1 P2G2 P3 G3 Cn F182 G Cn + x Cn + y Cn + zP
3
P0 G0 P1 G1 P2 G2 P3 G3 Cn F182 G Cn + x Cn + y Cn + z P
4
** ALUs may be either F181, F381, or 2901A.
Figure 1. 32-Bit ALU with Ripple Carry Between 16-Bit Lookahead ALUs
FAST AND LS TTL DATA 4-100

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