TL F 9492
54F74F182
Carry
Lookahead
Generator
December 1994
54F 74F182
Carry Lookahead Generator
General Description
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
Features
Y
Provides lookahead carries across a group of four
ALUs
Y
Multi-level lookahead high-speed arithmetic operation
over long word lengths
Y
Guaranteed 4000V minimum ESD protection
Commercial
Military
Package
Package Description
Number
74F182PC
N16E
16-Lead (0 300 Wide) Molded Dual-In-Line
54F182DM (Note 2)
J16A
16-Lead Ceramic Dual-In-Line
74F182SJ (Note 1)
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
IEEE IEC
TL F 9492 6
TL F 9492 3
Pin Assignment for
DIP SOIC and Flatpak
TL F 9492 1
Pin Assignment
for LCC
TL F 9492 2
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105 Printed in U S A
Unit Loading Fan Out
54F 74F
Pin Names
Description
U L
Input I
IH
I
IL
HIGH LOW
Output I
OH
I
OL
C
n
Carry Input
1 0 2 0
20 mA
b
1 2 mA
G
0
G
2
Carry Generate Inputs (Active LOW)
1 0 14 0
20 mA
b
8 4 mA
G
1
Carry Generate Input (Active LOW)
1 0 16 0
20 mA
b
9 6 mA
G
3
Carry Generate Input (Active LOW)
1 0 8 0
20 mA
b
4 8 mA
P
0
P
1
Carry Propagate Inputs (Active LOW)
1 0 8 0
20 mA
b
4 8 mA
P
2
Carry Propagate Input (Active LOW)
1 0 6 0
20 mA
b
3 6 mA
P
3
Carry Propagate Input (Active LOW)
1 0 4 0
20 mA
b
2 4 mA
C
nax
b
C
naz
Carry Outputs
50 33 3
b
1 mA 20 mA
G
Carry Generate Output (Active LOW)
50 33 3
b
1 mA 20 mA
P
Carry Propagate Output (Active LOW)
50 33 3
b
1 mA 20 mA
Functional Description
The 'F182 carry lookahead generator accepts up to four
pairs of Active LOW Carry Propagate (P
0
P
3
) and Carry
Generate (G
0
G
3
) signals and an Active HIGH Carry input
(C
n
) and provides anticipated Active HIGH carries (C
n a x
C
nay
C
naz
) 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
C
nax
e
G
0
a
P
0
C
n
C
nay
e
G
1
a
P
1
G
0
a
P
1
P
0
C
n
C
naz
e
G
2
a
P
2
G
1
a
P
2
P
1
G
0
a
P
2
P
1
P
0
C
n
G
e
G
3
a
P
3
G
2
a
P
3
P
2
G
1
a
P
3
P
2
P
1
G
0
P
e
P
2
P
2
P
1
P
0
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 gen-
erator are identical in both cases Carries are rippled be-
tween 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
Outputs
C
n
G
0
P
0
G
1
P
1
G
2
P
2
G
3
P
3
C
nax
C
nay
C
naz
G
P
X
H
H
L
L
H
X
L
X
L
X
H
H
X
L
H
X
X
X
H
H
L
X
H
H
H
X
L
L
H
X
H
X
L
X
X
X
L
X
H
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
H
X
X
X
X
X
H
H
H
X
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
X
L
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
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
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)
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
b
55 C to
a
125 C
Junction Temperature under Bias
b
55 C to
a
175 C
Plastic
b
55 C to
a
150 C
V
CC
Pin Potential to
Ground Pin
b
0 5V to
a
7 0V
Input Voltage (Note 2)
b
0 5V to
a
7 0V
Input Current (Note 2)
b
30 mA to
a
5 0 mA
Voltage Applied to Output
in HIGH State (with V
CC
e
0V)
Standard Output
b
0 5V to V
CC
TRI-STATE Output
b
0 5V to
a
5 5V
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(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
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
b
55 C to
a
125 C
Commercial
0 C to
a
70 C
Supply Voltage
Military
a
4 5V to
a
5 5V
Commercial
a
4 5V to
a
5 5V
DC Electrical Characteristics
Symbol
Parameter
54F 74F
Units
V
CC
Conditions
Min
Typ
Max
V
IH
Input HIGH Voltage
2 0
V
Recognized as a HIGH Signal
V
IL
Input LOW Voltage
0 8
V
Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
b
1 2
V
Min
I
IN
e b
18 mA
V
OH
Output HIGH
54F 10% V
CC
2 5
I
OH
e b
1 mA
Voltage
74F 10% V
CC
2 5
V
Min
I
OH
e b
1 mA
74F 5% V
CC
2 7
I
OH
e b
1 mA
V
OL
Output LOW
54F 10% V
CC
0 5
V
Min
I
OL
e
20 mA
Voltage
74F 10% V
CC
0 5
I
OL
e
20 mA
I
IH
Input HIGH
54F
20 0
m
A
Max
V
IN
e
2 7V
Current
74F
5 0
I
BVI
Input HIGH Current
54F
100
m
A
Max
V
IN
e
7 0V
Breakdown Test
74F
7 0
I
CEX
Output HIGH
54F
250
m
A
Max
V
OUT
e
V
CC
Leakage Current
74F
50
V
ID
Input Leakage
74F
4 75
V
0 0
I
ID
e
1 9 mA
Test
All Other Pins Grounded
I
OD
Output Leakage
74F
3 75
m
A
0 0
V
IOD
e
150 mV
Circuit Current
All Other Pins Grounded
I
IL
Input LOW
b
1 2
V
IN
e
0 5V (C
n
)
Current
b
2 4
V
IN
e
0 5V (P
3
)
b
3 6
mA
Max
V
IN
e
0 5V (P
2
)
b
4 8
V
IN
e
0 5V (G
3
P
0
P
1
)
b
8 4
V
IN
e
0 5V (G
0
G
2
)
b
9 6
V
IN
e
0 5V (G
1
)
I
OS
Output Short-Circuit Current
b
60
b
150
mA
Max
V
OUT
e
0V
I
CCH
Power Supply Current
18 4
28 0
mA
Max
V
O
e
HIGH
I
CCL
Power Supply Current
23 5
36 0
mA
Max
V
O
e
LOW
4
AC Electrical Characteristics
74F
54F
74F
T
A
e a
25 C
T
A
V
CC
e
Mil
T
A
V
CC
e
Com
Symbol
Parameter
V
CC
e a
5 0V
C
L
e
50 pF
C
L
e
50 pF
Units
C
L
e
50 pF
Min
Typ
Max
Min
Max
Min
Max
t
PLH
Propagation Delay
3 0
6 6
8 5
3 0
12 0
3 0
9 5
ns
t
PHL
C
n
to C
nax
C
nay
C
naz
3 0
6 8
9 0
3 0
11 0
3 0
10 0
t
PLH
Propagation Delay
2 5
6 2
8 0
2 5
11 0
2 5
9 0
t
PHL
P
0
P
1
or P
2
to
1 5
3 7
5 0
1 0
7 0
1 5
6 0
ns
C
nax
C
nay
or C
naz
t
PLH
Propagation Delay
2 5
6 5
8 5
2 5
11 0
2 5
9 5
t
PHL
G
0
G
1
or G
2
to
1 5
3 9
5 2
1 0
7 0
1 5
6 0
ns
C
nax
C
nay
or C
naz
t
PLH
Propagation Delay
3 0
7 9
10 0
3 0
12 0
3 0
11 0
ns
t
PHL
P
1
P
2
or P
3
to G
3 0
6 0
8 0
2 5
10 0
3 0
9 0
t
PLH
Propagation Delay
3 0
8 3
10 5
3 0
12 0
3 0
11 5
ns
t
PHL
G
n
to G
3 0
5 7
7 5
2 5
10 0
3 0
8 5
t
PLH
Propagation Delay
3 0
5 7
7 5
2 5
10 0
3 0
8 5
ns
t
PHL
P
n
to P
2 5
4 1
5 5
2 5
8 0
2 5
6 5
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
C
QB
Temperature Range Family
Special Variations
74F
e
Commercial
QB
e
Military grade with
54F
e
Military
environmental and burn-in
processing shipped in tubes
Device Type
Temperature Range
Package Code
C
e
Commercial (0 C to
a
70 C)
P
e
Plastic DIP
M
e
Military (
b
55 C to
a
125 C)
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
54F74F182
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 As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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