OVERVIEW
The CF1156 series are CMOS melody LSIs with built-in LED driver that, together with a battery and piezo electric buzzer, operate in one of 3 melody modes determined by input level or bonding options. They also feature an oscillator stop function in non-play 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 greeting cards and toys.

FEATURES
■ LED direct drive
■ Requires few external components
■ 2.0 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
■ 2 VSS pad connections
■ Wide pitch dynamic range (G3 to D7)
■ Chip form