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SN54AS882A Datasheet

32-Bit Look-Ahead Carry Generators

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ą SN54AS882A, SN74AS882A
32ĆBIT LOOKĆAHEAD CARRY GENERATORS
ą
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
Directly Compatible With ’AS181B,
’AS1181, ’AS881B, and ’AS1881 ALUs
Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
Capable of Anticipating the Carry Across a
Group of Eight 4-Bit Binary Adders
Cascadable to Perform Look-Ahead Across
n-Bit Adders
Typical Carry Time, Cn to Any Cn+i, is Less
Than 6 ns
Dependable Texas Instruments Quality and
Reliability
SN54AS882A . . . JT PACKAGE
SN74AS882A . . . DW OR NT PACKAGE
(TOP VIEW)
Cn
G0
P0
G1
P1
Cn + 8
G2
P2
G3
P3
Cn − 16
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 NC
22 Cn + 32
21 P7
20 G7
19 P6
18 G6
17 Cn + 24
16 P5
15 G5
14 P4
13 G4
description
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.
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.
’AS882A LOGIC EQUATIONS
Cn+8 = G1 + P1G0+P1P0Cn
Cn+16 = G3 + P3G2 + P3P2G1 + P3P2P1G0
+ P3P2P1P0Cn
SN54AS882A . . . FK PACKAGE
SN74AS882A . . . DW OR NT PACKAGE
(TOP VIEW)
G1
P1
Cn + 8
NC
G2
P2
G3
4 3 2 1 28 27 26
5 25
6 24
7 23
8 22
9 21
10 20
11 19
12 13 14 15 16 17 18
P7
G7
P6
NC
G6
Cn + 24
P5
Cn+24 = G5 + P5G4 + P5P4G3 + P5P4P3G2
+ P5P4P3P2G1 + P5P4P3P2P1G0
+ P5P4P3P2P1P0Cn
Cn+32 = G7 + P7G6 + P7P6G5 + P7P6P5G4
+ P7P6P5P4G3 + P7P6P5P4P3G2
+ P7P6P5P4P3P2G1 + P7P6P5P4P3P2P1G0
+ P7P6P5P4P3P2P1P0Cn
NC − No internal connection
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
Copyright 1985, Texas Instruments Incorporated
1


Texas Instruments (TI) Electronic Components Datasheet

SN54AS882A Datasheet

32-Bit Look-Ahead Carry Generators

No Preview Available !

SN54AS882A, SN74AS882A
32ĆBIT LOOKĆAHEAD CARRY GENERATORS
ąą
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
logic symbol
1
Cn 3
P0
2
GO
5
P1
4
G1
8
P2
7
G2
10
P3
9
G3
14
P4
13
G4
16
P5
15
G5
19
P6
18
G6
21
P7
20
G7
CPG
C1
CP0
CG0
CP1
CG1
CP2
CG2
CP3
CG3
CP4
CG4
CP5
CG5
CP6
CG6
CP7
CG7
CO1
CO3
CO5
CO7
6
Cn+8
11
Cn+16
17
Cn+24
22
Cn+32
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.
ą
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001


Part Number SN54AS882A
Description 32-Bit Look-Ahead Carry Generators
Maker Texas
Total Page 9 Pages
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