UM3561 is a low-cost, low-power CMOS LSI designed for use in alarm and toy applications. Since the integrated circuit includes oscillator and selector circuits, a compact sound module can be constructed with only a few additional components. The M3561 contains a programmed mask ROM to simulate siren sound.
· Four sounds can be selected
· Power on reset
· Typical 3V operating voltage
· A magnetic speaker can be driven by an NPN transistor