The random number generators are used in many areas such as cryptography, the applications where the Monte-Carlo method is used, the application of numerical analysis with computer simulations and modeling. TRNGs that is used in the field of cryptography and secure communications require fast, secure and intensive process of the physical methods that do not have deterministic character are used as entropy source. These methods are direct reinforcement, dual oscillator and chaos-based applications. In recent years the great efforts are being made in the area of developing the chaos-based TRNG structures due to noise-like features and the ability of hiding informatory sign of chaotic oscillators. Chaos based TRNG's within the digital circuits are an effective alternative to the traditional chaos-based analog structure. Because TRNG systems that use analog chaotic signal generator are difficult to be synchronized with the transmitter and receiver. In addition, the weak resources that generates physical noises like thermal or scattering are used on the implementation of these circuits. The digital-based FPGA chips have a significant potential in improving the information security capabilities in some applications as cryptology and securing the communication which requires high performance and processor power. In this study, performance differences between conventional method of TRNG that used chaotic system and recently designed FPGA based chaotic systems have been compered.