UM66T

Unisonic Technologies

Audio - Melody Generators

CMOS LSI melody generator IC with on-chip ROM programmed for musical performance. Features built-in RC oscillator and very low power consumption.

The UM66T is a CMOS LSI melody generator IC designed for applications such as telephones and toys. It features an on-chip ROM programmed for musical performance, resulting in very low power consumption. With a built-in RC oscillator, a compact melody module can be constructed with minimal additional components. The IC operates in level-hold mode for repeated playback when the input is held at a certain level. A dynamic speaker can be driven with an external NPN transistor connected to the output pin.

Supply Voltage:

1.3V - 3.3V

Package:

3-pin TO

Max Frequency:

90.0 kHz

Key Features

64-note ROM memory
Built-in RC oscillator (no external timing components required)
Very low power consumption (16µA typical)
Wide operating voltage range: 1.3V to 3.3V
Level-hold mode for repeated playback
Can drive dynamic speaker with external NPN transistor
Compact TO-92 package
Multiple melody variants available

Applications

Doorbells
Telephones
Toys
Musical greeting cards
Alarm systems
Notification devices
Educational projects

Notes

The UM66T series includes various models, each programmed with a different melody. Examples include UM66T-08S (Happy Birthday), UM66T-09L (Wedding March), UM66T-19L (Für Elise), and UM66T-68L (It's a Small World). The output can directly drive a piezo buzzer or be amplified with an NPN transistor to drive a dynamic speaker. The IC automatically plays the melody when powered on and can repeat when configured in level-hold mode.