OVERVIEW
The SM1155 series are CMOS melody LSIs that, together with a battery and piezoelectric buzzer, operate in one of 3 melody modes determined by bonding options. They also feature an oscillator stop function in nonplay mode and a variable pull-down resistance function that responds to input levels in order to reduce power consumption, reduce cost, and extend battery life, making them ideal in a wide range of applications including the hold sound for telephones and toys.

FEATURES
■ Requires few external components
■ 1.2 to 3.6V wide operating voltage range
■ Low power consumption
■ 3 melody modes (bonding option)
■ Oscillator stop function in non-play mode
■ Power saving pull-down resistor built-in
■ RC oscillator circuit
■ Power-ON initialization function
■ Wide pitch dynamic range (G3 to D7)
■ 8-pin SOP package