INTRODUCTION
SNC658 is a 20 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
♦ 20 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
♦ 64K*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