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