SN74AS882A [TI]
32-BIT LOOK-AHEAD CARRY GENERATORS; 32位先行进位发生器
| 型号： | SN74AS882A |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 32-BIT LOOK-AHEAD CARRY GENERATORS |
| 文件： | 总9页 (文件大小：153K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ꢀꢁ ꢂꢃ ꢄꢀ ꢅ ꢅ ꢆꢄ ꢇꢈ ꢀꢁꢉ ꢃꢄ ꢀ ꢅꢅ ꢆꢄ
ꢊ ꢆ ꢋꢌꢍ ꢎꢈ ꢏꢐ ꢐ ꢑꢋꢄꢒ ꢓꢄꢔꢈ ꢕꢄꢖꢖꢗꢈꢘ ꢓ ꢁꢓ ꢖꢄꢎꢐ ꢖꢀ
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SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
SN54AS882A . . . JT PACKAGE
SN74AS882A . . . DW OR NT PACKAGE
• Directly Compatible With ’AS181B,
’AS1181, ’AS881B, and ’AS1881 ALUs
(TOP VIEW)
• Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
C
V
CC
NC
1
24
23
22
21
20
19
18
17
16
15
14
13
n
G0
P0
G1
P1
2
C
3
n + 32
• Capable of Anticipating the Carry Across a
P7
G7
P6
G6
C
4
Group of Eight 4-Bit Binary Adders
5
C
• Cascadable to Perform Look-Ahead Across
6
n + 8
G2
P2
G3
P3
n-Bit Adders
7
8
n + 24
• Typical Carry Time, C to Any C , is Less
n
n+i
P5
G5
P4
G4
9
Than 6 ns
10
11
12
• Dependable Texas Instruments Quality and
C
n − 16
GND
Reliability
description
SN54AS882A . . . FK PACKAGE
The ’AS882A is a high-speed look-ahead carry
generator capable of anticipating the carry across
a group of eight 4-bit adders permitting the
designer to implement look-ahead for a 32-bit ALU
with a single package or, by cascading ’AS882As,
full look-ahead is possible across n-bit adders.
SN74AS882A . . . DW OR NT PACKAGE
(TOP VIEW)
4
3
2 1 28 27 26
5
6
7
8
9
The SN54AS882A is characterized for operation
over the full military temperature range of −55°C
to 125°C. The SN74AS882A is characterized for
operation from 0°C to 70°C.
G1
P1
25 P7
G7
23 P6
24
C
n + 8
NC
G2
P2
G3
NC
22
G6
C
P5
21
20
19
’AS882A LOGIC EQUATIONS
10
n + 24
11
C
C
=
=
G1 + P1G0+P1P0C
n
n+8
12 13 14 15 16 17 18
G3 + P3G2 + P3P2G1 + P3P2P1G0
+ P3P2P1P0C
n+16
n
C
=
=
G5 + P5G4 + P5P4G3 + P5P4P3G2
+ P5P4P3P2G1 + P5P4P3P2P1G0
n+24
n+32
NC − No internal connection
+ P5P4P3P2P1P0C
n
C
G7 + P7G6 + P7P6G5 + P7P6P5G4
+ P7P6P5P4G3 + P7P6P5P4P3G2
+ P7P6P5P4P3P2G1 + P7P6P5P4P3P2P1G0
+ P7P6P5P4P3P2P1P0C
n
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Copyright 1985, Texas Instruments Incorporated
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢅꢆ ꢄꢇ ꢈ ꢀ ꢁꢉ ꢃ ꢄꢀ ꢅ ꢅ ꢆ ꢄ
ꢊ ꢆꢋ ꢌꢍ ꢎ ꢈ ꢏ ꢐꢐꢑꢋꢄ ꢒꢓ ꢄꢔ ꢈꢕꢄ ꢖꢖꢗꢈ ꢘꢓ ꢁ ꢓ ꢖꢄꢎꢐ ꢖꢀ
ꢙ ꢙ
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SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
†
logic symbol
CPG
1
C
C1
n
3
2
5
P0
GO
P1
CP0
CG0
CP1
4
8
G1
P2
CG1
CP2
6
CO1
CO3
C
C
n+8
7
G2
P3
CG2
CP3
10
11
n+16
9
G3
CG3
14
13
17
22
P4
G4
CP4
CG4
CO5
CO7
C
C
n+24
n+32
16
15
19
18
21
20
P5
G5
P6
G6
P7
G7
CP5
CG5
CP6
CG6
CP7
CG7
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for DW, JT, and NT packages.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂꢃ ꢄꢀ ꢅ ꢅ ꢆꢄ ꢇꢈ ꢀꢁ ꢉꢃꢄ ꢀ ꢅꢅ ꢆꢄ
ꢊ ꢆ ꢋꢌꢍ ꢎꢈ ꢏꢐ ꢐ ꢑꢋꢄꢒ ꢓꢄꢔꢈ ꢕꢄꢖꢖꢗꢈꢘ ꢓ ꢁꢓ ꢖꢄꢎꢐ ꢖꢀ
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SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
FUNCTION TABLE
FOR C OUTPUT
n + 32
INPUTS
G7 G6 G5 G4 G3 G2 G1 G0 P7 P6 P5 P4 P3 P2 P1 P0
OUTPUT
C
C
n + 32
n
L
X
X
X
X
X
X
X
X
X
L
X
X
L
X
X
X
L
X
X
X
X
L
X
X
X
X
X
L
X
X
X
X
X
X
L
X
X
X
X
X
X
X
L
X
L
L
L
L
L
L
L
L
X
X
L
L
L
L
L
L
L
X
X
X
L
L
L
L
L
L
X
X
X
X
L
L
L
L
L
X
X
X
X
X
L
X
X
X
X
X
X
L
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
L
X
H
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
L
L
X
L
L
L
All other combinations
FUNCTION TABLE
FOR C OUTPUT
n+24
INPUTS
OUTPUT
G5
L
G4
X
G3
G2
X
G1
X
G0
X
P5
X
L
P4
X
X
L
P3
X
X
X
L
P2
X
X
X
X
L
P1
P0
X
X
X
X
X
X
L
C
C
n + 24
n
X
X
L
X
X
X
X
X
L
X
H
X
L
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
L
X
X
X
X
X
L
X
X
X
X
X
X
L
X
X
L
L
X
X
X
L
X
L
L
L
X
X
X
X
L
L
L
L
L
X
X
X
X
X
L
L
L
L
L
All other combinations
Function Tables
FOR C
OUTPUT
FOR C
OUTPUT
n + 16
n + 8
INPUTS
G3 G2 G1 G0 P3 P2 P1 P0 C
INPUTS
G1 G0 P1 P0 C
n
OUTPUT
OUTPUT
C
C
n + 16
n
n + 16
H
L
X
L
X
X
X
X
X
L
X
X
X
X
X
L
X
L
L
L
L
X
X
L
L
L
X
X
X
L
X
X
X
X
L
X
H
L
X
L
X
L
L
X
X
L
X
H
H
L
X
X
X
X
X
X
X
H
H
H
H
H
L
X
X
X
H
X
All other combinations
X
L
All other combinations
Any inputs not shown in a given table are irrelevant with respect to that output.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢅꢆ ꢄꢇ ꢈ ꢀ ꢁꢉ ꢃ ꢄꢀ ꢅ ꢅ ꢆ ꢄ
ꢊ ꢆꢋ ꢌꢍ ꢎ ꢈ ꢏ ꢐꢐꢑꢋꢄ ꢒꢓ ꢄꢔ ꢈꢕꢄ ꢖꢖꢗꢈ ꢘꢓ ꢁ ꢓ ꢖꢄꢎꢐ ꢖꢀ
ꢙ ꢙ
ꢙ
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
logic diagram (positive logic)
21
P7
19
P6
16
P5
14
P4
22
C
n + 32
10
P3
8
P2
5
P1
3
P0
20
G7
18
G6
15
G5
13
G4
17
C
n + 24
9
G3
7
G2
4
G1
2
G0
11
C
n + 16
6
C
n + 8
1
Cn
Pin numbers shown are for DW, JT, and NT packages.
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂꢃ ꢄꢀ ꢅ ꢅ ꢆꢄ ꢇꢈ ꢀꢁ ꢉꢃꢄ ꢀ ꢅꢅ ꢆꢄ
ꢊ ꢆ ꢋꢌꢍ ꢎꢈ ꢏꢐ ꢐ ꢑꢋꢄꢒ ꢓꢄꢔꢈ ꢕꢄꢖꢖꢗꢈꢘ ꢓ ꢁꢓ ꢖꢄꢎꢐ ꢖꢀ
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SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range: SN54AS882A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74AS882A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
recommended operating conditions
SN54AS882A
MIN NOM MAX
SN74AS882A
MIN NOM MAX
UNIT
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
0.8
−2
0.8
−2
20
70
V
IL
I
I
mA
mA
°C
OH
OL
20
T
A
−55
125
0
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢅꢆ ꢄꢇ ꢈ ꢀ ꢁꢉ ꢃ ꢄꢀ ꢅ ꢅ ꢆ ꢄ
ꢊ ꢆꢋ ꢌꢍ ꢎ ꢈ ꢏ ꢐꢐꢑꢋꢄ ꢒꢓ ꢄꢔ ꢈꢕꢄ ꢖꢖꢗꢈ ꢘꢓ ꢁ ꢓ ꢖꢄꢎꢐ ꢖꢀ
ꢙ ꢙ
ꢙ
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS882A
SN74AS882A
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
V
V
= 4.5 V,
I = −18 mA
−1.2
−1.2
V
V
V
IK
CC
CC
CC
I
= 4.5 V to 5.5 V,
= 4.5 V,
I
I
= −2 mA
= 20 mA
V
CC
−2
V
CC
−2
OH
OL
OH
OL
0.3
0.5
0.4
0.8
1.2
1.5
0.9
0.3
0.2
0.1
80
0.3
0.5
0.4
0.8
1.2
1.5
0.9
0.3
0.2
0.1
80
C , P 0, P1
n
G0, G6
G1, G2, G4
G3, G5
G7
I
I
I
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V,
= 5.5 V,
V = 7 V
I
mA
I
P2, P3
P4, P5
P6, P7
C , P 0, P1
n
G0, G6
G1, G2, G4
G3, G5
G7
160
240
300
180
60
160
240
300
180
60
V = 2.7 V
I
µA
IH
P2, P3
P4, P5
P6, P7
40
40
20
20
C , P 0, P1
n
−2
−2
G0, G6
G1, G2, G4
G3, G5
G7
−4
−4
−6
−6
V = 0.4 V
I
−7.5
−4.5
−1.5
−1
−7.5
−4.5
−1.5
−1
mA
IL
P2, P3
P4, P5
P6, P7
−0.5
−130
70
−0.5
−30
70
‡
I
I
V
V
= 5.5 V,
= 5.5 V
V = 2.25 V
O
−30
−30
mA
mA
O
CC
44
44
CC
CC
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
.
OS
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂꢃ ꢄꢀ ꢅ ꢅ ꢆꢄ ꢇꢈ ꢀꢁ ꢉꢃꢄ ꢀ ꢅꢅ ꢆꢄ
ꢊ ꢆ ꢋꢌꢍ ꢎꢈ ꢏꢐ ꢐ ꢑꢋꢄꢒ ꢓꢄꢔꢈ ꢕꢄꢖꢖꢗꢈꢘ ꢓ ꢁꢓ ꢖꢄꢎꢐ ꢖꢀ
ꢙ
ꢙ
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
switching characteristics (see Note 1)
V
C
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
R
T
= 500 Ω,
= MIN to MAX
L
A
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
SN54AS882A
SN74AS882A
MIN
2
MAX
10
15
8
MIN
2
MAX
9
t
t
t
t
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
C
Any output
n
3
3
14
7
2
2
P or G
P or G
P or G
P or G
C
+ 8
n
2
8
2
7
2
8
2
7
ns
C
+ 16
+ 24
+ 32
n
2
8
2
7
2
8
2
7
C
C
n
n
2
11
9
2
10
8
1.5
2
2
13
2
12
NOTE 1: Load circuits and voltage waveforms are shown in Section 1.
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77001
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢅꢆ ꢄꢇ ꢈ ꢀ ꢁꢉ ꢃ ꢄꢀ ꢅ ꢅ ꢆ ꢄ
ꢊ ꢆꢋ ꢌꢍ ꢎ ꢈ ꢏ ꢐꢐꢑꢋꢄ ꢒꢓ ꢄꢔ ꢈꢕꢄ ꢖꢖꢗꢈ ꢘꢓ ꢁ ꢓ ꢖꢄꢎꢐ ꢖꢀ
ꢙ ꢙ
ꢙ
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
TYPICAL APPLICATION DATA
The application given in Figure 1 illustrates how the ’AS882A can implement look-ahead carry for a 32-bit ALU
(in this case, the popular ’AS881A) with a single package. Typical carry times shown are derived using the
standard Advanced Schottky load circuit.
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
LSB
MSB
’AS881A
6 ns
’AS881A
’AS881A
6 ns
C
6 ns
6 ns
6 ns
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
n
n−4
n
n−4
n
n−4
n
n−4
n
n−4
n
n−4
n
n−4
n
n−4
6 ns
6 ns
6 ns
’AS881A
’AS881A
’AS881A
’AS881A
’AS881A
F
F
F
F
F
F
F
F
P0 G0
P1 G1
C
P2 G2
’AS882A
P3
G3 C
P4 G4
P5 G5
C
n + 24
P6 G6
P7 G7
n + 8
n+16
6 ns
C
n
C
n + 32
7 ns
Figure 1
Likewise, Figure 2 illustrates the same 32-bit ALU using two ’AS882s. This shows the worst-case delay from
LSB to MSB to be 19 ns as opposed to 25 ns in Figure 1.
LSB
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B MSB
4
4
4
4
4
4
4
4
4
4
4
4
4
4
’AS881A
’AS881A
’AS881A
’AS881A
n
’AS881A
n
’AS881A
n
6 ns
6 ns
C
C
C
C
C
C
C
n
6 ns
n
n
n
6 ns
6 ns
’AS881A
’AS881A
F
F
F
F
F
F
F
F
P0
G0
P1 G1
6 ns
P2 G2
P3
G3
C
P4 G4
P5 G5
C
n + 24
P6 G6
P7 G7
n + 16
C
C
n + 32
n
’AS882A
L
H
P0 G0
P1 G1 C
P2 G2
P3 G3
C
P4 G4
P5
G5 C
n + 24
P6 G6
P7 G7
n + 8
n + 16
6 ns
C
’AS882A
7 ns
C
n + 32
n
C
n
Figure 2
8
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