# SN54S181

アクティブ

## 算術演算ロジック・ユニット / ファンクション・ジェネレータ

アクティブ

### 製品詳細

Technology family S Rating Military Operating temperature range (°C) -55 to 125
Technology family S Rating Military Operating temperature range (°C) -55 to 125
CDIP (J) 24 425.45 mm² 31.75 x 13.4
• Full Look-Ahead for High-Speed Operations on Long Words
• Input Clamping Diodes Minimize Transmission-Line Effects
• Darlington Outputs Reduce Turn-Off Time
• Arithmetic Operating Modes:
• Subtraction
• Shift Operand A One Position
• Magnitude Comparison
• Plus Twelve Other Arithmetic Operations
• Logic Function Modes:
• Exclusive-OR
• Comparator
• AND, NAND, OR, NOR
• Plus Ten Other Logic Operations

• Full Look-Ahead for High-Speed Operations on Long Words
• Input Clamping Diodes Minimize Transmission-Line Effects
• Darlington Outputs Reduce Turn-Off Time
• Arithmetic Operating Modes:
• Subtraction
• Shift Operand A One Position
• Magnitude Comparison
• Plus Twelve Other Arithmetic Operations
• Logic Function Modes:
• Exclusive-OR
• Comparator
• AND, NAND, OR, NOR
• Plus Ten Other Logic Operations

If high speed is not of importance, a ripple-carry input (Cn) and a ripple-carry output (Cn+4) are available. However, the ripple-carry delay has also been minimized so that arithmetic manipulations for small word lengths can be performed without external circuitry.

The 'LS181 and 'S181 will accommodate active-high data if the pin designations are interpreted as follows:

Subtraction is accomplished by 1's complement addition where the 1's complement of the subtrahend is generated internally.The resultant output is A – B – 1, which requires an end-around or forced carry to provide A – B.

The 'LS181 or 'S181 can also be utilized as a comparator. The A = B output is internally decoded from the function outputs (F0, F1, F2, F3) so that when two words of equal magnitude are applied at the A and B inputs, it will assume a high level to indicate equality (A = B). The ALU must be in the subtract mode with Cn = H when performing this comparison. The A = B output is open-collector so that it can be wire-AND connected to give a comparison for more than four bits. The carry output (Cn+4) can also be used to supply relative magnitude information. Again, the ALU must be placed in the subtract mode by placing the function select inputs S3, S2, S1, S0 at L, H, H, L, respectively.

These circuits have been designed to not only incorporate all of the designer's requirements for arithmetic operations, but also to provide 16 possible functions of two Boolean variables without the use of external circuitry. These logic functions are selected by use of the four function-select inputs (S0, S1, S2, S3) with the mode-control input (M) at a high level to disable the internal carry. The 16 logic functions are detailed in Tables 1 and 2 and include exclusive-OR, NAND, AND, NOR, and OR functions.

Series 54, 54LS, and 54S devices are characterized for operation over the full military temperature range of -55°C to 125°C; Series 74LS and 74S devices are characterized for operation from 0°C to 70°C.

If high speed is not of importance, a ripple-carry input (Cn) and a ripple-carry output (Cn+4) are available. However, the ripple-carry delay has also been minimized so that arithmetic manipulations for small word lengths can be performed without external circuitry.

The 'LS181 and 'S181 will accommodate active-high data if the pin designations are interpreted as follows:

Subtraction is accomplished by 1's complement addition where the 1's complement of the subtrahend is generated internally.The resultant output is A – B – 1, which requires an end-around or forced carry to provide A – B.

The 'LS181 or 'S181 can also be utilized as a comparator. The A = B output is internally decoded from the function outputs (F0, F1, F2, F3) so that when two words of equal magnitude are applied at the A and B inputs, it will assume a high level to indicate equality (A = B). The ALU must be in the subtract mode with Cn = H when performing this comparison. The A = B output is open-collector so that it can be wire-AND connected to give a comparison for more than four bits. The carry output (Cn+4) can also be used to supply relative magnitude information. Again, the ALU must be placed in the subtract mode by placing the function select inputs S3, S2, S1, S0 at L, H, H, L, respectively.

These circuits have been designed to not only incorporate all of the designer's requirements for arithmetic operations, but also to provide 16 possible functions of two Boolean variables without the use of external circuitry. These logic functions are selected by use of the four function-select inputs (S0, S1, S2, S3) with the mode-control input (M) at a high level to disable the internal carry. The 16 logic functions are detailed in Tables 1 and 2 and include exclusive-OR, NAND, AND, NOR, and OR functions.

Series 54, 54LS, and 54S devices are characterized for operation over the full military temperature range of -55°C to 125°C; Series 74LS and 74S devices are characterized for operation from 0°C to 70°C.

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### 技術資料

star =TI が選定したこの製品の主要ドキュメント

9 をすべて表示

* データシート Arithmetic Logic Units/Function Generators データシート 1988年 3月 1日
セレクション・ガイド Logic Guide (Rev. AB) 2017年 6月 12日
アプリケーション・ノート Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 2015年 12月 2日
セレクション・ガイド ロジック・ガイド (Rev. AA 翻訳版) 最新英語版 (Rev.AB) 2014年 11月 6日
ユーザー・ガイド LOGIC Pocket Data Book (Rev. B) 2007年 1月 16日
アプリケーション・ノート Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 2004年 7月 8日
アプリケーション・ノート Designing With Logic (Rev. C) 1997年 6月 1日
アプリケーション・ノート Input and Output Characteristics of Digital Integrated Circuits 1996年 10月 1日
アプリケーション・ノート Live Insertion 1996年 10月 1日

### 設計と開発

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パッケージ ピン数 ダウンロード
CDIP (J) 24 オプションの表示

### 購入と品質

• RoHS
• REACH
• デバイスのマーキング
• リード端子の仕上げ / ボールの原材料
• MSL 定格 / ピーク リフロー
• MTBF/FIT 推定値
• 材質成分
• 認定試験結果
• 継続的な信頼性モニタ試験結果

• ファブの拠点
• 組み立てを実施した拠点

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