P-channel silicon gate MOS technology
The 4008 is a 8-bit address latch for
access to standard memory chips, and has one built-in
4-bit chip select and I/O port. It was designed to be
used with the 4009 to make it easier to interface to
It was used with other MCS-4/40 devices such as the 4004
and 4040 CPU
The 4008 was
available in the white ceramic ( C ) package, the brown
ceramic ( D ) package and the plastic ( P ) package with
gold or silver legs, grey and black plastic.
Some old versions have a embossed "i" an gold legs. They
are very rare and extremely
hard to find!