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參數(shù)資料
| 型號： | SN74LS181N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-BIT ARITHMETIC LOGIC UNIT |
| 中文描述： | LS SERIES, 4-BIT ARITHMETIC LOGIC UNIT, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 277K |
| 代理商： | SN74LS181N |
5-333
FAST AND LS TTL DATA
SN54/74LS181
LOGIC DIAGRAM
FUNCTIONAL DESCRIPTION
The SN54/74LS181 is a 4-bit high speed parallel Arithmetic
Logic Unit (ALU). Controlled by the four Function Select Inputs
(S0 . . . S3) and the Mode Control Input (M), it can perform all
the 16 possible logic operations or 16 different arithmetic
operations on active HIGH or active LOW operands. The
Function Table lists these operations.
When the Mode Control Input (M) is HIGH, all internal
carries are inhibited and the device performs logic operations
on the individual bits as listed. When the Mode Control Input is
LOW, the carries are enabled and the device performs
arithmetic operations on the two 4-bit words. The device
incorporates full internal carry lookahead and provides for
either ripple carry between devices using the Cn+4 output, or
for carry lookahead between packages using the signals P
(Carry Propagate) and G (Carry Generate), P and G are not
affected by carry in. When speed requirements are not
stringent, the LS181 can be used in a simple ripple carry mode
by connecting the Carry Output (Cn+4) signal to the Carry Input
(Cn) of the next unit. For high speed operation the LS181 is
used in conjunction with the 9342 or 93S42 carry lookahead
circuit. One carry lookahead package is required for each
group of the four LS181 devices. Carry lookahead can be
provided at various levels and offers high speed capability
over extremely long word lengths.
The A = B output from the LS181 goes HIGH when all four F
outputs are HIGH and can be used to indicate logic
equivalence over four bits when the unit is in the subtract
mode. The A = B output is open collector and can be
wired-AND with other A = B outputs to give a comparison for
more then four bits. The A = B signal can also be used with the
Cn+4 signal to indicate A>B and A<B.
The Function Table lists the arithmetic operations that are
performed without a carry in. An incoming carry adds a one to
each operation. Thus, select code LHHL generates A minus B
minus 1 (2s complement notation) without a carry in and
generates A minus B when a carry is applied. Because
subtraction is actually performed by complementary addition
(1s complement), a carry out means borrow; thus a carry is
generated when there is no underflow and no carry is
generated when there is underflow.
As indicated, the LS181 can be used with either active LOW
inputs producing active LOW outputs or with active HIGH
inputs producing active HIGH outputs. For either case the
table lists the operations that are performed to the operands
labeled inside the logic symbol.
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相關(guān)代理商/技術(shù)參數(shù) |
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| SN74LS181NE4 | 功能描述:算數(shù)邏輯單元 - ALU Arith Logic Unit/ Function Generator RoHS:否 制造商:ON Semiconductor 高電平輸出電流: 低電平輸出電流: 傳播延遲時間: 電源電壓-最大:18 V 電源電壓-最小:3 V 封裝 / 箱體:SOIC-16 Wide 最大工作溫度:+ 125 C 封裝:Reel |
| SN74LS183D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS189AN | 制造商:Texas Instruments 功能描述: |
| SN74LS191D | 功能描述:計數(shù)器 IC 4-Bit Sync Up/Down RoHS:否 制造商:NXP Semiconductors 計數(shù)器類型:Binary Counters 邏輯系列:74LV 位數(shù):10 計數(shù)法: 計數(shù)順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| SN74LS191DE4 | 功能描述:計數(shù)器 IC 4-Bit Sync Up/Down RoHS:否 制造商:NXP Semiconductors 計數(shù)器類型:Binary Counters 邏輯系列:74LV 位數(shù):10 計數(shù)法: 計數(shù)順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
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