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參數(shù)資料
| 型號(hào)： | HD74AC182 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Carry Lookhead Generator |
| 中文描述： | 卡里L(fēng)ookhead發(fā)生器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 65K |
| 代理商： | HD74AC182 |
HD74AC182/HD74ACT182
3
Logic Diagram
C
n
C
n+x
C
n+y
C
n+z
G
0
P
0
G
1
G
P
P
1
G
2
P
2
G
3
P
3
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Functional Description
The HD74AC182/HD74ACT182 carry lookahead generator accepts up to four pairs of Active Low Carry
Propagate (
P
0
to
P
3
) and Carry Generate (
G
0
to
G
3
) signals and an Active High Carry input (Cn) and
provides anticipated Active High carries (C
n + x
, C
n + y
, C
n + z
) across four groups of binary adders. The
HD74AC182/HD74ACT182 also has Active Low Carry Propagate (
P
) and Carry Generate (
G
) outputs
which may be used for further level of lookahead. The logic equations provided at the outputs are:
C
n + x
= G
0
+ P
0
C
n
C
n + y
= G
1
+ P
1
G
0
+ P
1
P
0
C
n
C
n + z
= G
2
+ P
2
G
1
+ P
2
P
1
G
0
+ P
2
P
1
P
0
C
n
G
= G
3
+ P
3
G
2
+ P
3
P
2
G
1
+ P
3
P
2
P
1
G
0
P
= P
3
P
2
P
1
P
0
Also, the HD74AC182/HD74ACT182 can be used with binary ALUs in an active Low or active High input
operand mode. The connections (Figure a) to and from the ALU to the carry lookahead generator are
identical in both cases. Carries are rippled between 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 HD74AC182/HD74ACT182.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD74ACT182 | Carry Lookhead Generator(先行進(jìn)位發(fā)生器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74AC182/HD74ACT182 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD74AC182FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Look-Ahead Carry Generator |
| HD74AC182P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Look-Ahead Carry Generator |
| HD74AC194 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit Bidirectional Unviersal Shift Register |
| HD74AC194FPEL | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit Bidirectional Unviersal Shift Register |
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