The 74181 is a 4-bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit. Introduced by Texas Instruments in February 1970, [1] it was the first complete ALU on a single chip. [2] It was used as the arithmetic/logic core in the CPUs of many historically significant minicomputers and other devices.

But in March 1970, Texas Instruments introduced the 74181 Arithmetic / Logic Unit (ALU) chip, which put a full 4-bit ALU on one fast TTL chip. This chip provided 32 arithmetic and logic functions, as well as carry lookahead for high performance.

In March 1970, Texas Instruments entered the game by showing the world a real ALU, the 74181 chip. Although it was released in early 1970, the first mentions of it appear as early as August 1969 in the “TTL Integrated Circuits Catalog from Texas Instruments,” three months before the N8260 was launched.

Nov 19, 2017 · And for decades the 74181, as an all-in-one 4-bit ALU on a chip that you might have found in a minicomputer at the turn of the 1970s, represented the most convenient way to teach the operation of ...

The 74181 ALU chip is a complex, high-performance TTL chip that was a key component in the processor of many minicomputers. I took detailed die photos of the 74181 ALU that reveal how the chip works internally.

May 19, 2020 · Hi, I am building a simple computer for fun that uses the 74181 Arithmetic Logic Units. These ALUs were the basis of some of the older vintage computer designs. I am trying to identify a Register part number to use for the Accumulator (ACC).

Mar 27, 2017 · One of the more famous of these devices is the 74181, a cascadable 4-bit arithmetic logic unit, or ALU. An ALU is the heart of a microprocessor, performing its operations.

Mar 10, 2018 · The 74181 was a popular chip in the 1970s used to perform calculations in the arithmetic-logic unit (ALU) of minicomputers. It is a moderately complex chip containing about 67 gates and 170 transistors 3, implemented using fast …

This applet demonstrates a fast 12-bit ALU built from three 4-bit 74181 ALU chips and one 74182 carry-lookahead generator chip. The internal structure of the 74182 chips is shown in the next applet.

The combinational logic circuitry of the 74181 integrated circuit. The 74181 is a 7400 series medium-scale integration (MSI) TTL integrated circuit, containing the equivalent of 75 logic gates [3] and most commonly packaged as a 24-pin DIP.