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SN74AS882ADWR Arkusz danych(PDF) 8 Page - Texas Instruments

Numer części SN74AS882ADWR
Szczegółowy opis  32-BIT LOOK-AHEAD CARRY GENERATORS
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SN74AS882ADWR Arkusz danych(HTML) 8 Page - Texas Instruments

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SN54AS882A, SN74AS882A
32BIT LOOKAHEAD CARRY GENERATORS
SDAS235 − D2661, DECEMBER 1982 − REVISED NOVEMBER 1985
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77001
8
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.
’AS881A
’AS881A
’AS881A
Cn+16
Cn + 8
’AS881A
6 ns
6 ns
A
B
Cn
Cn−4
’AS881A
Cn−4
Cn
Cn
B
A
B
A
F
F
F
’AS881A
Cn
F
A
B
6 ns
F
Cn−4
Cn−4
Cn−4
P0G0G1
P1G2
P2P4G4
P3G3
F
F
B
A
B
A
B
A
B
A
F
G5
P5G6
P6G7
P7
Cn + 24
7 ns
MSB
LSB
Cn
’AS882A
Cn + 32
Cn
Cn
Cn
Cn
Cn−4
Cn−4
Cn−4
’AS881A
’AS881A
6 ns
6 ns
6 ns
6 ns
6 ns
6 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.
Cn
6 ns
7 ns
F
F
A
44
B
4
A
4
B
4
A
LSB
B
4
Cn
L
P0G0
H
G1
P1
G2
P2
Cn
Cn
Cn + 8
4
B
A
4
B
4
4
A
F
Cn
6 ns
4
A
B
4
F
F
’AS881A
’AS881A
’AS881A
’AS881A
’AS881A
’AS881A
’AS881A
’AS881A
Cn
Cn
Cn
Cn
F
F
F
A
B
4
A
4
B
Cn + 16
Cn + 24
Cn + 32
P3G3P4G4P6G6P7G7
G5
P5
’AS882A
P0G0P1G1Cn + 16
P2
Cn
G2P3G3
P4G4
’AS882A
P5G5G6
P6
Cn + 24
P7G7
Cn + 32
MSB
6 ns
6 ns
6 ns
6 ns
6 ns
Figure 2


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