Part Number : UM66TXXL
Function : CMOS IC / Melody Intergrated Circuit
Package : TO-92 Type
Maker : Unisonic Technologies
Pinouts : 
Description :
The UTC UM66TXXL series are CMOS LSI designed for using in door bell, telephone and toy application. It is an on-chip ROM programmed for musical performance. Produced by CMOS technology, the device results in very low power consumption.
Features
1. 64-Note Rom memory
2. 1.5V ~ 4.5V power supply and low power consumption
2. Dynamic speaker can be driven with external NPN transistor
3. OSC resistor hold mode
4. Power on reset: melody begins from the first note
5. Built in level hold mode
Datasheet PDF Download : 
Others datasheet of same file :
UM66T05L, UM66T05LK, UM66T08L, UM66T08LK, UM66T11L