INTRODUCTION

SNC678 is a 61 seconds single chip 4-channel voice synthesizer IC which contains 24

I/O pins and a tiny controller. By programming through the tiny controller, users’

applications including section combination, trigger modes, output status, high

performance melody, multiple voices, and other logic functions can be implemented.

FEATURES

◆ Single power supply 2.4V – 5.5V

◆ Built in a tiny controller

◆ 42 seconds voice capacity are provided

◆ Six 4-bit I/O ports are provided

◆ 256*4 bits RAM are provided

◆ Maximum 64k program ROM is provided

◆ 132K *12 ROM size is provided for voice data and program

◆ Readable ROM code data

◆ Built in a high quality speech synthesizer

◆ Four independent voice channels

◆ Adaptive playing speed from 4k-40kHz is provided for all 4 channels individually

◆ Automatic repetition for every channel

◆ A 6-bit*8-bit Multiplier is embed to modulate the volume of synthesized voices

◆ Two digital mixers (with saturation control) are provided

◆ Built in a PWM Direct Drive circuit and a current output DA converters.

◆ Built in 15 levels PWM output volume control.

◆ System clock: 8M Hz ( RC-type or Crystal Option)

◆ Low Voltage Reset