for simplicity of calculation of no of pins
i don't no either
The number of transistors in a defined square area on an IC chip.
Only a 555 can replace a 555, there is no equivalent. 555s are made by many companies, each with their own prefixes and suffixes, but all are 555s.
An IC or integrated circuit consists of a chip ("die") and plastic or ceramic packaging to protect the die from mechanical and (some) electrical damage. An IC with more than one die is usually called a "hybrid" IC. A "monolithic" IC is just a plain old one-die IC, but it implies that functions from a number of ICs have been incorporated into that one IC. One form of monolithic IC is where the functions of a powerful graphics processor is put on the same die as a CPU. An SOC ("System On a Chip") is another trend in monolithic ICs. "Monolithic" is something of a transitional term. Floating point, memory management, and processing units all used to to be on separate ICs. Now they are all on the same IC, but we don't call them "monolithic" any more.
If you mean microprocessor then Intel is usually credited with the 4004. If you just mean the first digital IC used in a computer, probably Fairchild.
Hc4066, hct4066
555 is an arbitrarily assigned part number for a general purpose programmable timer IC. The number itself has no special meaning.
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7404
7404
naming of IC is done according to manufacturer's name, ic type and IC number. i think MC means motorola is manufacturer. 74 means TTL IC. It is 7408 IC and H means high
98123056
99 = IC (-1+100) But today's conversion of 99 into Roman numerals is XCIX However, the Romans themselves would have probably wrote out the number 99 as LXXXXVIIII which then can be simplified to IC
Not all the IC's are starts from 74 , it is TTL series IC's starting numbers basically 74 series are digital IC's . GATE FLIP-FLOP COUNTER REGISTER ADDER ALU
ic 7493
6.000........