54F182.pdf
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164 KB
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Pobierz
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
Package
Commercial
Military
Package Description
Number
16-Lead (0.300
×
Wide) Molded Dual-In-Line
74F182PC
N16E
54F182DM (Note 2)
J16A
16-Lead Ceramic Dual-In-Line
16-Lead (0.300
×
Wide) Molded Small Outline, EIAJ
74F182SJ (Note 1)
M16D
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
Pin Assignment
for LCC
IEEE/IEC
TL/F/9492±1
TL/F/9492±2
TL/F/9492±6
TL/F/9492±3
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/9492
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
m
A/
b
1.2 mA
20
m
A/
b
8.4 mA
G
0
,G
2
Carry Generate Inputs (Active LOW)
1.0/14.0
G
1
Carry Generate Input (Active LOW)
1.0/16.0
20
m
A/
b
9.6 mA
G
3
Carry Generate Input (Active LOW)
1.0/8.0
20
m
A/
b
4.8 mA
P
0
,P
1
Carry Propagate Inputs (Active LOW)
1.0/8.0
20
m
A/
b
4.8 mA
P
2
Carry Propagate Input (Active LOW)
1.0/6.0
20
m
A/
b
3.6 mA
P
3
Carry Propagate Input (Active LOW)
1.0/4.0
20
m
A/
b
2.4 mA
C
n
a
x
b
C
n
a
z
Carry Outputs
50/33.3
b
1 mA/20 mA
b
1 mA/20 mA
G
Carry Generate Output (Active LOW)
50/33.3
P
Carry Propagate Output (Active LOW)
50/33.3
b
1 mA/20 mA
Functional Description
The 'F182 carry lookahead generator a
c
ce
p
ts up to four
pairs of A
ct
ive
L
OW 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
n
a
y
,C
n
a
z
) across four groups of binary
a
dders. The
'F182 also
h
as 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
n
a
x
e
G
0
a
P
0
C
n
C
n
a
y
e
G
1
a
P
1
G
0
a
P
1
P
0
C
n
C
n
a
z
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
Also, the 'F182 can be used with binary ALUs in an active
LOW or active HIGH input operand mode. The connections
(Figure1) 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.
e
G
3
a
P
3
G
2
a
P
3
P
2
G
1
a
P
3
P
2
P
1
G
0
e
P
2
P
2
P
1
P
0
P
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
In
pu
ts Outputs
C
n
G
0
P
0
G
1
P
1
G
2
P
2
G
3
P
3
C
n
a
x
C
n
a
y
C
n
a
z
G P
XHH
L
LHX
L
XLX
H
HXL
H
XXXHH
L
XHHHX
L
LHXHX
L
XXXLX
H
XLXXL
H
HXLXL
H
XXXXXHH
L
XXXHHHX
L
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
XHHHXHX
L
LHXHXHX
L
XXXXXLX
H
XXXLXXL
H
XLXXLXL
H
HXLXLXL
H
X XXXXHH
H
X
X
X
H
H
H
X
H
X HHHXHX
H
H HXHXHX
H
X XXXXLX
L
X XXLXXL
L
X
L
X
X
L
X
L
L
L XLXLXL
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
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
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
b
55
§
Cto
a
125
§
C
b
65
§
Cto
a
150
§
C
0
§
Cto
a
70
§
C
Commercial
Ambient Temperature under Bias
b
55
§
Cto
a
125
§
C
Supply Voltage
Military
Junction Temperature under Bias
b
55
§
Cto
a
175
§
C
a
4.5V to
a
5.5V
Plastic
b
55
§
Cto
a
150
§
C
Commercial
a
4.5V to
a
5.5V
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
b
30 mA to
a
5.0 mA
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
e
0V)
Standard Output
b
0.5V to V
CC
TRI-STATE
É
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.
DC Electrical Characteristics
54F/74F
Symbol
Parameter
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
eb
18 mA
V
OH
Output HIGH
54F 10% V
CC
2.5
I
OH
eb
1mA
I
OH
eb
1mA
Voltage
74F 10% V
CC
2.5
V
Min
74F 5% V
CC
2.7
I
OH
eb
1mA
V
OL
Output LOW
54F 10% V
CC
0.5
I
OL
e
20 mA
V
Min
I
OL
e
20 mA
Voltage
74F 10% V
CC
0.5
I
IH
Input HIGH
54F
20.0
V
IN
e
2.7V
m
A
Max
Current
74F
5.0
I
BVI
Input HIGH Current
54F
100
V
IN
e
7.0V
m
A
Max
Breakdown Test
74F
7.0
I
CEX
Output HIGH
54F
250
V
OUT
e
V
CC
m
A
Max
Leakage Current
74F
50
I
ID
e
1.9
m
A
V
ID
Input Leakage
74F
4.75
V
0.0
Test
All Other Pins Grounded
I
OD
Output Leakage
V
IOD
e
150 mV
74F
3.75
m
A
0.0
Circuit Current
All Other Pins Grounded
b
1.2
V
IN
e
0.5V (
C
n
)
I
IL
Input LOW
Current
b
2.4
V
IN
e
0.5V (
P
3
)
b
3.6
V
IN
e
0.5V (
P
2
)
mA
Max
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
)
b
60
b
150
V
OUT
e
0V
I
OS
Output Short-Circuit Current
mA
Max
V
O
e
HIGH
I
CCH
Power Supply Current
18.4
28.0
mA
Max
V
O
e
LOW
I
CCL
Power Supply Current
23.5
36.0
mA
Max
4
AC Electrical Characteristics
74F
54F
74F
T
A
ea
25
§
C
T
A
,V
CC
e
Mil
T
A
,V
CC
e
Com
Symbol
Parameter
V
CC
ea
5.0V
Units
C
L
e
50 pF
C
L
e
50 pF
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
n
a
x
,C
n
a
y
,C
n
a
z
3.0
6.8
9.0
3.0
11.0
3.0
10.0
t
PLH
P
ro
p
agati
on
Delay
2.5
6.2
8.0
2.5
11.0
2.5
9.0
t
PHL
P
0
,P
1
,orP
2
to
ns
1.5
3.7
5.0
1.0
7.0
1.5
6.0
C
n
a
x
,C
n
a
y
,orC
n
a
z
t
PLH
Pr
o
pa
gatio
n
Delay
2.5
6.5
8.5
2.5
11.0
2.5
9.5
t
PHL
G
0
,G
1
,orG
2
to
ns
1.5
3.9
5.2
1.0
7.0
1.5
6.0
C
n
a
x
,C
n
a
y
,orC
n
a
z
t
PLH
P
ro
p
agati
on
De
la
y
3.0
7.9
10.0
3.0
12.0
3.0
11.0
ns
t
PHL
P
1
,P
2
,orP
3
to G
3.0
6.0
8.0
2.5
10.0
3.0
9.0
t
PLH
Pr
opa
ga
tion 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
P
rop
ag
ation 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
§
Cto
a
70
§
C)
P
e
Plastic DIP
M
e
Military (
b
55
§
Cto
a
125
§
C)
D
e
Ceramic DIP
F
e
Flatpak
L
e
Leadless Chip Carrier (LCC)
SJ
e
Small Outline SOIC EIAJ
5
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