NationalSemi > NatSemi1NS4004D

Modified: May 30, 2005, 6:08 pm

Manufacturer:	National Semiconductor
Model:	1NS4004D
Speed:	740KHz
Type:	4004
Data Code:	7835
Introduced:	1971
Transistors:	2300
Package:	16 CDIP w/ Gold lid
Process:	10 Micron
Architecture:	4 Bit
Used in:	Calculators EPROM progammers
Description:	The first microprocessor in history, Intel 4004 was a 4-bit CPU designed for usage in calculators, or, as we say now, designed for "embedded applications". Clocked at 740 KHz, the 4004 executed up to 92,000 single word instructions per second, could access 4 KB of program memory and 640 bytes of RAM. Although the Intel 4004 was perfect fit for calculators and similar applications it was not very suitable for microcomputer use due to its somewhat limited architecture. The 4004 lacked interrupt support, had only 3-level deep stack, and used complicated method of accessing the RAM. Some of these shortcomings were fixed in the 4004 successor - Intel 4040. National was the only 4004 second source.