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Details, datasheet, quote on part number:SN74AS882A
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Datasheet text preview:
SN54AS882A, SN74AS882A 32-BIT LOOK-AHEAD CARRY GENERATORS
SDAS235 D2661, DECEMBER 1982 REVISED NOVEMBER 1985
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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 23 22 21 20 19 18 17 16 15 14 13
V CC NC Cn + 32 P7 G7 P6 G6 Cn + 24 P5 G5 P4 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.
SN54AS882A . . . FK PACKAGE SN74AS882A . . . DW OR NT PACKAGE (TOP VIEW)
P0 G0 Cn NC VCC NC C n + 32 G1 P1 Cn + 8 NC G2 P2 G3
5 6 7 8 9 10 4 3 2 1 28 27 26 25 24 23 22 21 20 11 19 12 13 14 15 16 17 18
'AS882A LOGIC EQUATIONS
Cn+8 Cn+16 Cn+24 = = = G1 + P1G0+P1P0Cn G3 + P3G2 + P3P2G1 + P3P2P1G0 + P3P2P1P0Cn G5 + P5G4 + P5P4G3 + P5P4P3G2 + P5P4P3P2G1 + P5P4P3P2P1G0 + P5P4P3P2P1P0Cn G7 + P7G6 + P7P6G5 + P7P6P5G4 + P7P6P5P4G3 + P7P6P5P4P3G2 + P7P6P5P4P3P2G1 + P7P6P5P4P3P2P1G0 + P7P6P5P4P3P2P1P0Cn
P7 G7 P6 NC G6 Cn + 24 P5
NC No internal connection
Cn+32
=
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
P3 C n + 16 GND NC G4 P4 G5
Copyright © 1985, Texas Instruments Incorporated
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SN54AS882A, SN74AS882A 32-BIT LOOK-AHEAD CARRY GENERATORS
SDAS235 D2661, DECEMBER 1982 REVISED NOVEMBER 1985
logic symbol
CPG Cn P0 GO P1 G1 P2 G2 P3 G3 P4 G4 P5 G5 P6 G6 P7 G7 1 3 2 5 4 8 7 10 9 14 13 16 15 19 18 21 20 C1 CP0 CG0 CP1 CG1 CP2 CG2 CP3 CG3 CP4 CG4 CP5 CG5 CP6 CG6 CP7 CG7 CO5 CO7 17 22 Cn+24 Cn+32 CO1 CO3 6 11 Cn+8 Cn+16
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.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54AS882A, SN74AS882A 32-BIT LOOK-AHEAD CARRY GENERATORS
SDAS235 D2661, DECEMBER 1982 REVISED NOVEMBER 1985
FUNCTION TABLE FOR Cn + 32 OUTPUT INPUTS G7 L X X X X X X X X G6 X L X X X X X X X G5 X X L X X X X X X G4 X X X L X X X X X G3 X X X X L X X X X G2 X X X X X L X X X G1 X X X X X X L X X G0 X X X X X X X L X P7 X L L L L L L L L P6 X X L L L L L L L P5 X X X L L L L L L P4 X X X X L L L L L P3 X X X X X L L L L P2 X X X X X X L L L P1 X X X X X X X L L P0 X X X X X X X X L Cn X X X X X X X X H OUTPUT Cn + 32 H H H H H H H H H L
All other combinations FUNCTION TABLE FOR Cn+24 OUTPUT INPUTS G5 L X X X X X X G4 X L X X X X X G3 X X L X X X X G2 X X X L X X X G1 X X X X L X X G0 X X X X X L X P5 X L L L L L L P4 X X L L L L L P3 X X X L L L L P2 X X X X L L L P1 X X X X X L L P0 X X X X X X L Cn X X X X X X H
OUTPUT Cn + 24 H H H H H H H L
All other combinations
Function Tables
FOR Cn + 16 OUTPUT INPUTS G3 G2 G1 G0 P3 P2 P1 P0 L X X X X X L X X X X X L X X X X X L X X L L L L X X L L L X X X L L X X X X L OUTPUT Cn Cn + 16 H X H X H X H X H H L FOR Cn + 8 OUTPUT INPUTS G1 G0 P1 P0 Cn L X X X L X X L L X X L X X H OUTPUT Cn + 16 H H H L
All other combinations
All other combinations Any inputs not shown in a given table are irrelevant with respect to that output.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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