8021-2 : DING-DONG SOUND EFFECT GENERATOR IC __________________________________________________________________________ General Description The 8021-2 is a ding-dong sound effect generator IC produced by LSI CMOS technology. With built-in RC oscillator and digital envelope circuits, minimal external components are required. This IC simulates the mechanical ding-dong sound, and is ideal for door bell application. Features - 1.3V to 3.3V operating voltage and low power consumption - One-shot mode of 2 ding-dong playing sequences - Standard TO-92 package form - Dynamic speaker can be driven with external NPN transistor Absolute Maximum Ratings DC Supply Voltage ........................................... -0.3V to +5.0V Operating Ambient Temperature .................... -10°C to 60°C Storage Temperature ....................................... -55°C to 125°C Electrical Characteristics (Vss=0V, Vdd=1.5V, Ta=25°C, unless otherwise specified.) Parameter Symbol Min. Typ. Max. Conditions Operating voltage Vdd 1.3V 1.5V 3.3V Current stand-by Is 0.5µA All terminal open operating Idd 0.5mA 1mA Osc. frequency Focs 102kHz 120kHz 144kHz Pin assignment of TO-92 package form Application Circuit REV.9-98