# UM3481A Multi-Instrument Melody Generator

## Features
· Powered by 1.5V battery
· Low standby current
· 512-note memory (up to 16 songs)
· 8 playing modes
· 14 tones selectable
· Built-in RC oscillator
· On-chip envelope modulator and pre-amplifier

## General Description
· CMOS technology melody generator
· Plays pre-programmed melodies
· Generates 16 songs with 3 instrument effects (piano, organ, mandolin)
· Includes pre-amplifier

## Absolute Maximum Ratings
· DC Supply Voltage: -0.3V to +5.0V
· Input Voltage Range: Vss-0.3V to Vdd+0.3V
· Operating Ambient Temperature: 0°C to +70°C
· Storage Temperature: -10°C to +125°C

## Electrical Characteristics (Vdd=1.5V, Ta=25°C)
· Operating Voltage (Vdd): 1.3V - 5V
· Standby Current (Isb): 12µA
· Input Voltage High (Vih): Vdd-0.3V - Vdd
· Input Voltage Low (Vil): Vss - Vss+0.3V
· Output Current: 200µA - 1200µA

## Playing Modes
· CE, SL, LP, and AS pins control playback
· Modes range from standby to repeating songs or changing to the next melody

## Song Series List
· UM3481: 8 songs (Jingle Bells, Santa Claus, etc.)
· UM3482: 12 songs (American Patrol, Rabbits, etc.)
· UM3485: 5 songs (The Hawaiian Wedding Song, Love Story, Yesterday, etc.)

## Pin Configuration
· TSP: Melody auto-stop flag
· CE: Chip enable
· LP: Single song or all songs playback
· SL: Select next song
· AS: Melody repeat or stop
· ENV: Envelope circuit terminal
· Vdd: Positive power supply

## Typical Application Circuits
· Melody doorbell
· Low-cost speaker applications (one-shot and level-hold)
· Piezo buzzer applications (one-shot and level-hold)