This part is a kind of semiconductor called LM2240.

Function of this product has Programmable Timer/Counter.

Manufacturers : National Semiconductor

Image and pinout :

Some of the text within the PDF file :

LM2240 Programmable Timer Counter August 1990 LM2240 Programmable Timer Counter General Description The LM2240 Programmable Timer Counter is a monolithic controller capable of both monostable and astable operation Monostable operation allows accurate microsecond to five day time delays Long delays up to three years can easily be generated by cascading two timers The timer consists of a time-base oscillator programmable 8-bit counter and control flip-flop An external resistor-capacitor (RC) network sets the oscillator frequency and allows delay times from 1 RC to 255 RC to be selected In the astable mode of operation a single RC network sets the base frequency The frequencies of the squarewaves at the 8 outputs are each at different factors of 2 from the base frequenc [ ... ]

LM2240 PDF Datasheet Download