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The SC5180B are single-chip voice synthesizing CMOS IC. They are embedded EPROM architecture, and OTP (One Time Programmable) Speech chip, Each body has one input and two I/O pins. Through accurate internal oscillation, external Rosc is unnecessary. There is PWM and 13bit DAC output for voice. Thus any external component is not required.Maximum 128 voice groups. serial mode maximum 255 voice groups ,moble One Group contain several steps(voice section ); Maximum 1536 steps and 16 steps volume control for all the Groups. Maximum 44.1Khz Play Rate,Maximum 180 seconds Voice/ Midi.Each Step can be define Trigger Mode, Output Status, Voice Section, Mute length, I/O Type & Simple Programming Function. Support three mode trigger IC (Stand Alone, Serial Trigger Mode ). Easy use development system is for function selection and voice combination . PC download the ROM code by the OTP_Writer.