NSC 54F182

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
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