Information for "74181"

Basic information

Display title74181
Default sort key74181
Page length (in bytes)10,856
Page ID13939428
Page content languageEnglish

The 74S181 4-bit ALU bitslice resting on a page from the datasheet.

The 74181 is a bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit. The first complete ALU on a single chip,<ref>'Computer Structures: Principles and Examples' C. Gordon Bell page 63: "The earliest and most famous chip, the 74181 arithmetic logic unit (ALU), provided up to 32 functions of two 4-bit variables."</ref> it was used as the arithmetic/logic core in the CPUs of many historically significant minicomputers and other devices.

The 74181 represents an evolutionary step between the CPUs of the 1960s, which were constructed using discrete logic gates, and today's single-chip CPUs or microprocessors. Although no longer used in commercial products, the 74181 is still referenced in computer organization textbooks and technical papers. It is also sometimes used in 'hands-on' college courses, to train future computer architects.

74181 sections
Intro  Specifications  Significance  Today  Computers  Other uses   See also   References  External links  

PREVIOUS: IntroNEXT: Specifications
Page content modelwikitext
Indexing by robotsAllowed
Number of views44
Number of redirects to this page1

Page protection

EditAllow all users
MoveAllow all users

Edit history

Page creatorKenShirriff (Talk | contribs)
Date of page creation03:22, 23 April 2015
Latest editorKenShirriff (Talk | contribs)
Date of latest edit03:22, 23 April 2015
Total number of edits1
Total number of distinct authors1
Recent number of edits (within past 91 days)0
Recent number of distinct authors0