This is one of the TTL types.
Part Number : SN74LS04
Function : Hex Inverter, LOW POWER SCHOTTKY
Package : DIP, SOP 14 Pin
Manufacturers : ON Semiconductor
These devices contain six independent inverters. The 74LS04 contains six independent gates each of which performs the logic INVERT function (NOT GATES). Performing similar experiments can also allow the simple construction of AM radio transmitters, since the speed of most 7404 chips is well beyond the range of standard AM radios. The 74LS04 is an inverting buffer, especially useful when the output of one circuit cannot sink much current. A computer’s parallel port is a notorious example and can easily be damaged by excessive current draw.
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Other data sheets within the file : 74LS04, 74LS04P, SN74LS04D, SN74LS04N