UM3561 is a low-cost, low-power CMOS LSI designed for use in alarm and toy applications. Sincethe integrated circuit includes oscillator and selector circuits, a compact sound module can beconstructed with only a few additional components. The M3561 contains a programmed mask ROMto simulate siren sound.
ï Four sounds can be selected ï Power on reset.ï Typical 3V operating voltage ï A magnetic speaker can be driven byconnectingï 8-pin DIP package form an NPN transistor