IC stands for Integrated Circuit in the field of electronics. It is also widely known as microchip, silicon chip, microcircuit or just chip. It is actually a miniaturized form of an electronic circuit that has been manufactured in the surface of thin substrate of semiconductor material. It mainly consists of semiconductor devices and passive components. On the other hand, a data sheet is a document summarizing the performance and other technical characteristics of an electrical component, a subsystem or software. The information provided on a data sheet should be sufficient for an engineer to integrate the component into the system. An IC data sheet is thus a document for a specific IC which provides all the information required to integrate the chip the right way.
An IC sheet must contain all the current ranges and correct voltages of a specific IC. All the pins that an IC has should be mentioned in detail in the datasheet. Also, the function of each pin should be given in full detail. While preparing an IC data sheet it should be kept in mind that a design engineer, a research scientist, an electronics manufacturer or a student studying engineering will be studying the worksheet and as such full details of the IC should be provided.
If you are looking for the IC sheet of a particular chip, you will find it on the internet. You can even download it for free as all chip manufacturers put their IC sheets on their websites. But beware of online scams and spywares.