INTRODUCTION
SN68090 is a 90 seconds single chip voice synthesizer IC which contains I/O pins and a tiny controller. By programming through the tiny controller, user’s applications including section combination, trigger modes, output status, and other logic functions can then be easily implemented.

FEATURES
♦ Single power supply 2.4V - 5.1V
♦ Built in a tiny controller
♦ 90 seconds voice capacity are provided
♦ Two 4-bit I/O ports and two 4-bit output ports are provided
♦ 64*4 bits RAM are provided
♦ Maximum 16k program ROM is provided
♦ Readable ROM code data
♦ Built in a high quality speech synthesizer
♦ Adaptive playing speed from 2.5k-20kHz is provided
♦ Built in a dual tone melody generator
♦ Speech/Dual tone melody mixer is provided
♦ Fixed current D/A output is provided to drive external connected transistor for sound output
♦ Low Voltage Reset