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Conservative chaotic flows have better ergodicity,therefore researching dynamics and applications of conservative systems has become a hot topic.We introduce a constant-perturbation into a 5-dimensional(5D)conservative model.Consequently,the line equilibria of original model have been changed to non-equilibrium.Plentiful chaos phenomena such as coexisting conservative flows can be observed in this modified system.In addition,by increasing the magnitude of the disturbance,the conservative system can be transformed to a dissipative system.Then,the modified system is realized by an xc7z020clg400 field programmable gate array(FPGA)chip.The designed chaotic oscillator consumes fewer resources and has high iteration speed.Finally,a pseudo random number generator based on this novel digital oscillator is designed.