The NOISE 1B is a simple digital noise source that produces pure white noise over the whole audio band ? out to more than 40Khz, in fact. With filtering, you can derive pink noise and other colours. It only requires a +5V supply to operate. The chip was arranged to be as close a replacement as possible notorious MM5837 digital noise generator which appears in early Korg MonoPolys, the Sequential Prophet 5, and the Oberheim OB-X, amongst others. It can be used to upgrade the noise source in these synths.. DIP8 enclosure.
Here is the link to the datasheet