RTS903

RTS903 DUAL-TONE MELODY GENERATOR Features - Wide operating voltage range: 2.4V to 5.0V Low Stand-by current 768-note ROM memory Direct LED drive, where LED flash is programmable. Typical oscillator frequency: 128 KHz Built-in digital envelope 1 sequence trigger key Audio output drives speaker directly. Power-ON Reset; melody begins from the first note. General Description RTS903 is a CMOS LSI designed for toys, doorbells, music boxes, and melody clocks/timers. It is designed to play pre-programmed melody and is capable of generating dual-tone melody and natural sounds in piano effect. By pushing the sequence trigger key, all songs are sequentially selected and played with an Auto -Stop function. In addition, RTS903 provides PLED and PEN pins to drive LED and the motor. The blinking of LED is programmable to meet different user applications. Pin Assignment Block Diagram OSCI OSCO Tone Generator Oscillator Circuit Modulator OUT PEN PLED NC NC OUT PEN PTB TRB NC NC 1 2 3 4 5 6 7 8 16 15 14 13 GND NC OSCO OSCI VDD PLED NC NC Rhythm Generator Address Counter Tempo Generator ROM Ripple Counter RTS90312 11 10 9 TRB PTB Control Logic V2.0 May/12/2002 www.msquaretech.com Page 6 of 1 The above information is the exclusive intellectual property of M-Square Technologies Corporation and shall not be disclosed, distributed without permission from M-Square. RTS903 Absolute Maximum Ratings DC Supply Voltage.......................................0V 5.0V Input/Output Voltage......